200 lines
8.4 KiB
JSON
200 lines
8.4 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-6420",
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"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
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"state": "PUBLISHED",
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"assignerShortName": "redhat",
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"dateReserved": "2026-04-16T06:03:46.656Z",
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"datePublished": "2026-05-06T10:19:39.121Z",
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"dateUpdated": "2026-11-05T21:55:40.613Z"
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},
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"containers": {
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"cna": {
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"title": "Keylime: keylime: security bypass due to hardcoded tpm quote nonce",
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"metrics": [
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{
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"other": {
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"content": {
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"value": "Moderate",
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"namespace": "https://access.redhat.com/security/updates/classification/"
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},
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"type": "Red Hat severity rating"
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}
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},
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{
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"cvssV3_1": {
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"attackComplexity": "LOW",
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"attackVector": "LOCAL",
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"availabilityImpact": "LOW",
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"baseScore": 6.3,
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"baseSeverity": "MEDIUM",
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"confidentialityImpact": "HIGH",
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"integrityImpact": "HIGH",
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"privilegesRequired": "HIGH",
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"scope": "UNCHANGED",
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"userInteraction": "NONE",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L",
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"version": "3.1"
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},
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"format": "CVSS"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"value": "A flaw was found in Keylime. An attacker with root access on an enrolled monitored machine, where the Keylime agent runs, can exploit a vulnerability in the Keylime verifier. The verifier uses a hardcoded challenge nonce for Trusted Platform Module (TPM) quote attestation instead of a cryptographically random value. This allows the attacker to stockpile valid TPM quotes and replay them to evade detection after compromising the system. This issue affects only the push model deployment."
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}
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],
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"affected": [
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{
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"versions": [
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{
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"status": "affected",
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"version": "7.14.0",
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"lessThan": "7.14.2",
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"versionType": "semver"
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}
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],
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"packageName": "keylime",
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"collectionURL": "https://github.com/keylime/keylime",
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"defaultStatus": "unaffected"
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},
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{
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"vendor": "Red Hat",
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"product": "Red Hat Enterprise Linux 10",
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"packageName": "keylime",
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"defaultStatus": "affected",
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"versions": [
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{
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"version": "0:7.14.1-5.el10_2.1",
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"lessThan": "*",
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"versionType": "rpm",
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"status": "unaffected"
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}
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],
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"cpes": [
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"cpe:/o:redhat:enterprise_linux:10.2"
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]
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},
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{
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"vendor": "Red Hat",
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"product": "Red Hat Enterprise Linux 9",
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"packageName": "keylime",
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"defaultStatus": "affected",
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"cpes": [
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"cpe:/a:redhat:enterprise_linux:9"
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]
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}
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],
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"references": [
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{
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"url": "https://access.redhat.com/errata/RHSA-2026:28582",
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"name": "RHSA-2026:28582",
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"tags": [
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"vendor-advisory",
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"x_refsource_REDHAT"
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]
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},
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{
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"url": "https://access.redhat.com/security/cve/CVE-2026-6420",
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"tags": [
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"vdb-entry",
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"x_refsource_REDHAT"
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]
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},
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{
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458889",
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"name": "RHBZ#2458889",
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"tags": [
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"issue-tracking",
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"x_refsource_REDHAT"
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]
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}
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],
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"datePublic": "2026-05-06T10:00:00.000Z",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-1241",
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"description": "Use of Predictable Algorithm in Random Number Generator",
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"lang": "en",
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"type": "CWE"
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}
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]
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}
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],
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"x_redhatCweChain": "CWE-1241: Use of Predictable Algorithm in Random Number Generator",
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"workarounds": [
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{
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"lang": "en",
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"value": "Primary fix (one-line change in keylime/models/verifier/evidence.py):\nBefore (vulnerable):\ndef generate_challenge(self, bit_length):\n\nself.challenge = Nonce.generate(bit_length)\n self.challenge = bytes.fromhex(\"49beed365aac777dae23564f5ad0ec\")\n\nAfter (fixed):\ndef generate_challenge(self, bit_length):\nself.challenge = Nonce.generate(bit_length)\n\nExisting partial mitigations (already active):\n\n1. TPM clock monotonicity check: limits each quote to one replay.\n2. Push attestation timeout (default 10s): constrains the quote generation window, but TPM throughput allows 50-200 quotes to be stockpiled in that time."
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}
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],
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"timeline": [
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{
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"lang": "en",
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"time": "2026-04-16T06:01:38.993Z",
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"value": "Reported to Red Hat."
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},
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{
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"lang": "en",
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"time": "2026-05-06T10:00:00.000Z",
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"value": "Made public."
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}
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],
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"credits": [
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{
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"lang": "en",
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"value": "Red Hat would like to thank Keylime developers for reporting this issue."
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}
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],
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"providerMetadata": {
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"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
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"shortName": "redhat",
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"dateUpdated": "2026-11-05T21:55:40.613Z"
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},
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"x_generator": {
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"engine": "cvelib 1.8.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-05-06T13:54:45.881598Z",
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"id": "CVE-2026-6420",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-05-06T15:24:21.052Z"
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}
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}
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]
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}
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} |