feat: add Zenbleed (CVE-2023-20593) and update fwdb to v270+i20230614
This commit is contained in:
Stéphane Lesimple
parent
0d93c6ffb4
commit
9bb79a18eb
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@ -24,7 +24,7 @@ jobs:
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fi
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- name: check direct execution
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run: |
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expected=15
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expected=16
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nb=$(sudo ./spectre-meltdown-checker.sh --batch json | jq '.[]|.CVE' | wc -l)
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if [ "$nb" -ne "$expected" ]; then
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echo "Invalid number of CVEs reported: $nb instead of $expected"
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@ -34,7 +34,7 @@ jobs:
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fi
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- name: check docker-compose run execution
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run: |
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expected=15
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expected=16
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docker-compose build
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nb=$(docker-compose run --rm spectre-meltdown-checker --batch json | jq '.[]|.CVE' | wc -l)
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if [ "$nb" -ne "$expected" ]; then
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@ -45,7 +45,7 @@ jobs:
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fi
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- name: check docker run execution
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run: |
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expected=15
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expected=16
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docker build -t spectre-meltdown-checker .
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nb=$(docker run --rm --privileged -v /boot:/boot:ro -v /dev/cpu:/dev/cpu:ro -v /lib/modules:/lib/modules:ro spectre-meltdown-checker --batch json | jq '.[]|.CVE' | wc -l)
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if [ "$nb" -ne "$expected" ]; then
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@ -20,6 +20,7 @@ CVE
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[CVE-2019-11135](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11135) | TSX asynchronous abort | TAA, ZombieLoad V2
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[CVE-2018-12207](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12207) | Machine Mheck Exception on Page Size Changes | MCEPSC, No eXcuses, iTLB Multihit
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[CVE-2020-0543](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0543) | Special Register Buffer Data Sampling | SRBDS
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[CVE-2023-20593](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20593) | Cross-Process Information Leak | Zenbleed
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Supported operating systems:
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- Linux (all versions, flavors and distros)
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@ -178,3 +179,9 @@ docker run --rm --privileged -v /boot:/boot:ro -v /dev/cpu:/dev/cpu:ro -v /lib/m
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- Impact: Kernel
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- Mitigation: microcode update + kernel update helping to protect various CPU internal buffers from unprivileged speculative access to data
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- Performance impact of the mitigation: low
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**CVE-2023-20593** Cross-Process Information Leak (Zenbleed)
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- Impact: Kernel & all software
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- Mitigation: either kernel mitigation by disabling a CPU optimization through an MSR bit, or CPU microcode mitigation
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- Performance impact of the mitigation: TBD
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@ -170,7 +170,7 @@ global_critical=0
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global_unknown=0
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nrpe_vuln=''
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supported_cve_list='CVE-2017-5753 CVE-2017-5715 CVE-2017-5754 CVE-2018-3640 CVE-2018-3639 CVE-2018-3615 CVE-2018-3620 CVE-2018-3646 CVE-2018-12126 CVE-2018-12130 CVE-2018-12127 CVE-2019-11091 CVE-2019-11135 CVE-2018-12207 CVE-2020-0543'
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supported_cve_list='CVE-2017-5753 CVE-2017-5715 CVE-2017-5754 CVE-2018-3640 CVE-2018-3639 CVE-2018-3615 CVE-2018-3620 CVE-2018-3646 CVE-2018-12126 CVE-2018-12130 CVE-2018-12127 CVE-2019-11091 CVE-2019-11135 CVE-2018-12207 CVE-2020-0543 CVE-2023-20593'
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# find a sane command to print colored messages, we prefer `printf` over `echo`
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# because `printf` behavior is more standard across Linux/BSD
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@ -295,6 +295,7 @@ cve2name()
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CVE-2019-11135) echo "ZombieLoad V2, TSX Asynchronous Abort (TAA)";;
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CVE-2018-12207) echo "No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)";;
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CVE-2020-0543) echo "Special Register Buffer Data Sampling (SRBDS)";;
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CVE-2023-20593) echo "Zenbleed, cross-process information leak";;
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*) echo "$0: error: invalid CVE '$1' passed to cve2name()" >&2; exit 255;;
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esac
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}
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@ -319,6 +320,7 @@ _is_cpu_affected_cached()
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CVE-2019-11135) return $variant_taa;;
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CVE-2018-12207) return $variant_itlbmh;;
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CVE-2020-0543) return $variant_srbds;;
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CVE-2023-20593) return $variant_zenbleed;;
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*) echo "$0: error: invalid variant '$1' passed to is_cpu_affected()" >&2; exit 255;;
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esac
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}
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@ -348,6 +350,7 @@ is_cpu_affected()
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variant_taa=''
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variant_itlbmh=''
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variant_srbds=''
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variant_zenbleed=''
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if is_cpu_mds_free; then
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[ -z "$variant_msbds" ] && variant_msbds=immune
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@ -380,6 +383,7 @@ is_cpu_affected()
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variant_mdsum=immune
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variant_taa=immune
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variant_srbds=immune
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variant_zenbleed=immune
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elif is_intel; then
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# Intel
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# https://github.com/crozone/SpectrePoC/issues/1 ^F E5200 => spectre 2 not affected
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@ -455,6 +459,7 @@ is_cpu_affected()
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_debug "is_cpu_affected: intel family < 6 is immune to l1tf"
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[ -z "$variantl1tf" ] && variantl1tf=immune
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fi
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variant_zenbleed=immune
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elif is_amd || is_hygon; then
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# AMD revised their statement about variant2 => affected
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# https://www.amd.com/en/corporate/speculative-execution
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@ -469,6 +474,12 @@ is_cpu_affected()
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_debug "is_cpu_affected: cpu not affected by speculative store bypass so not vuln to variant4"
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fi
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variantl1tf=immune
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# Zenbleed
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variant_zenbleed=immune
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amd_legacy_erratum "$(amd_model_range 0x17 0x30 0x0 0x4f 0xf)" && variant_zenbleed=vuln
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amd_legacy_erratum "$(amd_model_range 0x17 0x60 0x0 0x7f 0xf)" && variant_zenbleed=vuln
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amd_legacy_erratum "$(amd_model_range 0x17 0xa0 0x0 0xaf 0xf)" && variant_zenbleed=vuln
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elif [ "$cpu_vendor" = CAVIUM ]; then
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variant3=immune
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variant3a=immune
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@ -624,6 +635,7 @@ is_cpu_affected()
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[ "$variant_taa" = "immune" ] && variant_taa=1 || variant_taa=0
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[ "$variant_itlbmh" = "immune" ] && variant_itlbmh=1 || variant_itlbmh=0
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[ "$variant_srbds" = "immune" ] && variant_srbds=1 || variant_srbds=0
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[ "$variant_zenbleed" = "immune" ] && variant_zenbleed=1 || variant_zenbleed=0
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variantl1tf_sgx="$variantl1tf"
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# even if we are affected to L1TF, if there's no SGX, we're not affected to the original foreshadow
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[ "$cpuid_sgx" = 0 ] && variantl1tf_sgx=1
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@ -1247,6 +1259,7 @@ pvulnstatus()
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CVE-2019-11135) aka="TAA";;
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CVE-2018-12207) aka="ITLBMH";;
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CVE-2020-0543) aka="SRBDS";;
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CVE-2023-20593) aka="ZENBLEED";;
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*) echo "$0: error: invalid CVE '$1' passed to pvulnstatus()" >&2; exit 255;;
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esac
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@ -1987,6 +2000,7 @@ is_zen_cpu()
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[ "$cpu_family" = 23 ] && return 0
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return 1
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}
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is_moksha_cpu()
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{
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parse_cpu_details
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@ -1995,6 +2009,68 @@ is_moksha_cpu()
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return 1
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}
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# mimick the Linux macro
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##define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \
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# ((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end))
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amd_model_range()
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{
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echo $(( ($1 << 24) | ($2 << 16) | ($3 << 12) | ($4 << 4) | ($5) ))
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}
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# mimick the Linux func, usage:
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# amd_legacy_erratum $(amd_model_range 0x17 0x30 0x0 0x4f 0xf)
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# return true (0) if the current CPU is affected by this erratum, 1 otherwise
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amd_legacy_erratum()
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{
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_range="$1"
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_ms=$((cpu_model << 4 | cpu_stepping))
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if [ "$cpu_family" = $(( ( (_range) >> 24) & 0xff )) ] && \
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[ $_ms -ge $(( ( (_range) >> 12) & 0xfff )) ] && \
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[ $_ms -le $(( (_range) & 0xfff )) ]; then
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return 0
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fi
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return 1
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}
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# returns 0 (true) if yes, 1 otherwise
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# returns 2 if not applicable
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has_zenbleed_fixed_firmware()
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{
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# return cached data
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[ -n "$zenbleed_fw" ] && return "$zenbleed_fw"
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# or compute it:
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zenbleed_fw=2 # unknown
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# only amd
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if ! is_amd; then
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zenbleed_fw=1
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return $zenbleed_fw
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fi
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# list of known fixed firmwares, from commit 522b1d69219d8f083173819fde04f994aa051a98
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_tuples="
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0x30,0x3f,0x0830107a
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0x60,0x67,0x0860010b
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0x68,0x6f,0x08608105
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0x70,0x7f,0x08701032
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0xa0,0xaf,0x08a00008
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"
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for tuple in $_tuples; do
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_model_low=$( echo "$tuple" | cut -d, -f1)
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_model_high=$(echo "$tuple" | cut -d, -f2)
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_fwver=$( echo "$tuple" | cut -d, -f3)
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if [ $((cpu_model)) -ge $((_model_low)) ] && [ $((cpu_model)) -le $((_model_high)) ]; then
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if [ $((cpu_ucode)) -ge $((_fwver)) ]; then
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zenbleed_fw=0 # true
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break
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else
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zenbleed_fw=1 # false
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zenbleed_fw_required=$_fwver
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fi
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fi
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done
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unset _tuples
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return $zenbleed_fw
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}
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# Test if the current host is a Xen PV Dom0 / DomU
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is_xen() {
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if [ ! -d "$procfs/xen" ]; then
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@ -3296,6 +3372,21 @@ check_cpu()
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cpuid_srbds=0
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fi
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if is_amd; then
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_info_nol " * CPU microcode is known to fix Zenbleed: "
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has_zenbleed_fixed_firmware; ret=$?
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if [ $ret -eq 0 ]; then
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# affected CPU, new fw
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pstatus green YES
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elif [ $ret -eq 1 ]; then
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# affected CPU, old fw
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pstatus red NO "required version: $zenbleed_fw_required"
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else
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# unaffected CPU
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pstatus yellow NO
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fi
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fi
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_info_nol " * CPU microcode is known to cause stability problems: "
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if is_ucode_blacklisted; then
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pstatus red YES "$ucode_found"
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@ -5758,6 +5849,121 @@ check_CVE_2020_0543_bsd()
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fi
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}
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####################
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# Zenbleed section
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check_CVE_2023_20593()
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{
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cve='CVE-2023-20593'
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_info "\033[1;34m$cve aka '$(cve2name "$cve")'\033[0m"
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if [ "$os" = Linux ]; then
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check_CVE_2023_20593_linux
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#elif echo "$os" | grep -q BSD; then
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# check_CVE_2023_20593_bsd
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else
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_warn "Unsupported OS ($os)"
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fi
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}
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check_CVE_2023_20593_linux()
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{
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status=UNK
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sys_interface_available=0
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msg=''
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if [ "$opt_sysfs_only" != 1 ]; then
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_info_nol "* Zenbleed mitigation is supported by kernel: "
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kernel_zenbleed=''
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if [ -n "$kernel_err" ]; then
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kernel_zenbleed_err="$kernel_err"
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# commit 522b1d69219d8f083173819fde04f994aa051a98
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elif grep -q 'Zenbleed:' "$kernel"; then
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kernel_zenbleed="found zenbleed message in kernel image"
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fi
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if [ -n "$kernel_zenbleed" ]; then
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pstatus green YES "$kernel_zenbleed"
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elif [ -n "$kernel_zenbleed_err" ]; then
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pstatus yellow UNKNOWN "$kernel_zenbleed_err"
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else
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pstatus yellow NO
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fi
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_info_nol "* Zenbleed kernel mitigation enabled and active: "
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if [ "$opt_live" = 1 ]; then
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# read the DE_CFG MSR, we want to check the 9th bit
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# don't do it on non-Zen2 AMD CPUs or later, aka Family 17h,
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# as the behavior could be unknown on others
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if is_amd && [ "$cpu_family" -ge $((0x17)) ]; then
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read_msr 0xc0011029; ret=$?
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if [ $ret = $READ_MSR_RET_OK ]; then
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if [ $(( read_msr_value >> 9 & 1 )) -eq 1 ]; then
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pstatus green YES "FP_BACKUP_FIX bit set in DE_CFG"
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fp_backup_fix=1
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else
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pstatus yellow NO "FP_BACKUP_FIX is cleared in DE_CFG"
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fp_backup_fix=0
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fi
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elif [ $ret = $READ_MSR_RET_KO ]; then
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pstatus yellow UNKNOWN "Couldn't read the DE_CFG MSR"
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else
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pstatus yellow UNKNOWN "$read_msr_msg"
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fi
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else
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fp_backup_fix=0
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pstatus blue N/A "CPU is incompatible"
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fi
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else
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pstatus blue N/A "not testable in offline mode"
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fi
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_info_nol "* Zenbleed mitigation is supported by CPU microcode: "
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has_zenbleed_fixed_firmware; ret=$?
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if [ $ret -eq 0 ]; then
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pstatus green YES
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cpu_ucode_zenbleed=1
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elif [ $ret -eq 1 ]; then
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pstatus yellow NO
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cpu_ucode_zenbleed=2
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else
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pstatus yellow UNKNOWN
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cpu_ucode_zenbleed=3
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fi
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elif [ "$sys_interface_available" = 0 ]; then
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# we have no sysfs but were asked to use it only!
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msg="/sys vulnerability interface use forced, but it's not available!"
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status=UNK
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fi
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if ! is_cpu_affected "$cve" ; then
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# override status & msg in case CPU is not vulnerable after all
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pvulnstatus "$cve" OK "your CPU vendor reported your CPU model as not affected"
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elif [ -z "$msg" ]; then
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# if msg is empty, sysfs check didn't fill it, rely on our own test
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if [ "$opt_live" = 1 ]; then
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if [ "$fp_backup_fix" = 1 ] && [ "$cpu_ucode_zenbleed" = 1 ]; then
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# this should never happen, but if it does, it's interesting to know
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pvulnstatus $cve OK "Both your CPU microcode and kernel are mitigating Zenbleed"
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elif [ "$cpu_ucode_zenbleed" = 1 ]; then
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pvulnstatus $cve OK "Your CPU microcode mitigates Zenbleed"
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elif [ "$fp_backup_fix" = 1 ]; then
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pvulnstatus $cve OK "Your kernel mitigates Zenbleed"
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else
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pvulnstatus $cve VULN "Your kernel is too old to mitigate Zenbleed and your CPU microcode doesn't mitigate it either"
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fi
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else
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if [ "$cpu_ucode_zenbleed" = 1 ]; then
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pvulnstatus $cve OK "Your CPU microcode mitigates Zenbleed"
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elif [ -n "$kernel_zenbleed" ]; then
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pvulnstatus $cve OK "Your kernel mitigates Zenbleed"
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else
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pvulnstatus $cve VULN "Your kernel is too old to mitigate Zenbleed and your CPU microcode doesn't mitigate it either"
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fi
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fi
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else
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pvulnstatus $cve "$status" "$msg"
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fi
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}
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#######################
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# END OF VULNS SECTIONS
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@ -5850,7 +6056,7 @@ exit 0 # ok
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# The builtin version follows, but the user can download an up-to-date copy (to be stored in his $HOME) by using --update-fwdb
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# To update the builtin version itself (by *modifying* this very file), use --update-builtin-fwdb
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# %%% MCEDB v266+i20230512
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# %%% MCEDB v270+i20230614
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# I,0x00000611,0x00000B27,19961218
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# I,0x00000612,0x000000C6,19961210
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# I,0x00000616,0x000000C6,19961210
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@ -6286,8 +6492,8 @@ exit 0 # ok
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# A,0x00A10F01,0x0A100104,20220207
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# A,0x00A10F0B,0x0A100B07,20220610
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# A,0x00A10F10,0x0A101020,20220913
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# A,0x00A10F11,0x0A101116,20230127
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# A,0x00A10F12,0x0A101203,20230125
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# A,0x00A10F11,0x0A101135,20230509
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# A,0x00A10F12,0x0A101235,20230509
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# A,0x00A20F00,0x0A200025,20200121
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# A,0x00A20F10,0x0A201025,20211014
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# A,0x00A20F12,0x0A20120A,20211014
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@ -6299,5 +6505,5 @@ exit 0 # ok
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# A,0x00A60F11,0x0A601114,20220712
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# A,0x00A60F12,0x0A601203,20220715
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# A,0x00AA0F00,0x0AA00009,20221006
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# A,0x00AA0F01,0x0AA00107,20230127
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# A,0x00AA0F02,0x0AA00205,20230202
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# A,0x00AA0F01,0x0AA00112,20230510
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# A,0x00AA0F02,0x0AA0020E,20230510
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