321 lines
15 KiB
JSON
321 lines
15 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2026-50722",
|
|
"assignerOrgId": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "libreswan",
|
|
"dateReserved": "2026-06-05T16:10:05.751Z",
|
|
"datePublished": "2026-07-02T21:34:41.413Z",
|
|
"dateUpdated": "2026-07-07T17:02:06.722Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
|
|
"shortName": "libreswan",
|
|
"dateUpdated": "2026-07-02T21:34:41.413Z"
|
|
},
|
|
"title": "IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payload",
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"supportingMedia": [
|
|
{
|
|
"base64": false,
|
|
"type": "text/html",
|
|
"value": "<p>Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER encoding of the ASN.1 digest when the IKEv2 AUTH payload was encoded using RSASSA-PKCS1-v1_5 (RFC 8017). A remote attacker can use a variation on the Bleichenbacher attack to forge the AUTH payload when small public exponents are used (e.g., e=3), leading to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the AUTH payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of the remote IKE peer are not affected.</p>"
|
|
}
|
|
],
|
|
"value": "Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER encoding of the ASN.1 digest when the IKEv2 AUTH payload was encoded using RSASSA-PKCS1-v1_5 (RFC 8017). A remote attacker can use a variation on the Bleichenbacher attack to forge the AUTH payload when small public exponents are used (e.g., e=3), leading to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the AUTH payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of the remote IKE peer are not affected."
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"vendor": "The Libreswan Project",
|
|
"product": "libreswan",
|
|
"packageName": "libreswan",
|
|
"collectionURL": "https://github.com/libreswan/libreswan",
|
|
"repo": "https://github.com/libreswan/libreswan",
|
|
"versions": [
|
|
{
|
|
"version": "0",
|
|
"status": "affected",
|
|
"lessThanOrEqual": "5.3",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.3.1",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
}
|
|
],
|
|
"defaultStatus": "unaffected",
|
|
"programRoutines": [
|
|
{
|
|
"name": "RSA_authenticate_hash_signature_pkcs1_1_5_rsa"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"problemTypes": [
|
|
{
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"type": "CWE",
|
|
"cweId": "CWE-347",
|
|
"description": "CWE-347: Improper Verification of Cryptographic Signature"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"type": "CWE",
|
|
"cweId": "CWE-617",
|
|
"description": "CWE-617: Reachable Assertion"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"impacts": [
|
|
{
|
|
"capecId": "CAPEC-463",
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "Denial of Service via assertion failure in pluto daemon when processing malformed RSA PKCS#1 v1.5 AUTH payloads"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"capecId": "CAPEC-473",
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "Authentication bypass via Bleichenbacher-style signature forgery when weak RSA exponents (e.g., e=3) are in use"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"format": "CVSS",
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "GENERAL"
|
|
}
|
|
],
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
|
|
"baseScore": 7.5,
|
|
"baseSeverity": "HIGH",
|
|
"attackVector": "NETWORK",
|
|
"attackComplexity": "LOW",
|
|
"privilegesRequired": "NONE",
|
|
"userInteraction": "NONE",
|
|
"scope": "UNCHANGED",
|
|
"confidentialityImpact": "NONE",
|
|
"integrityImpact": "NONE",
|
|
"availabilityImpact": "HIGH"
|
|
}
|
|
},
|
|
{
|
|
"format": "CVSS",
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "Weak RSA exponent (e=3) in use, enabling Bleichenbacher signature forgery"
|
|
}
|
|
],
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
|
|
"baseScore": 8.1,
|
|
"baseSeverity": "HIGH",
|
|
"attackVector": "NETWORK",
|
|
"attackComplexity": "HIGH",
|
|
"privilegesRequired": "NONE",
|
|
"userInteraction": "NONE",
|
|
"scope": "UNCHANGED",
|
|
"confidentialityImpact": "HIGH",
|
|
"integrityImpact": "HIGH",
|
|
"availabilityImpact": "HIGH"
|
|
}
|
|
},
|
|
{
|
|
"other": {
|
|
"type": "vendorSeverity",
|
|
"content": {
|
|
"value": "MEDIUM",
|
|
"description": "Vendor-assessed severity: Medium. Authentication bypass requires weak RSA exponents (e=3) which have been disallowed by most cryptographic libraries for over a decade. DoS is mitigated by automatic daemon restart."
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"workarounds": [
|
|
{
|
|
"lang": "en",
|
|
"supportingMedia": [
|
|
{
|
|
"base64": false,
|
|
"type": "text/html",
|
|
"value": "<p>If Windows support is not needed, configure <code>authby=ecdsa</code> or <code>authby=rsa-sha2</code> (or both via <code>authby=ecdsa,rsa-sha2</code>) to disallow the fallback of RSA PKCS#1 1.5. The <code>leftauth=</code> and <code>rightauth=</code> settings can be updated similarly if those are in use instead of <code>authby</code>.</p>"
|
|
}
|
|
],
|
|
"value": "If Windows support is not needed, configure authby=ecdsa or authby=rsa-sha2 (or both via authby=ecdsa,rsa-sha2) to disallow the fallback of RSA PKCS#1 1.5. The leftauth= and rightauth= settings can be updated similarly if those are in use instead of authby."
|
|
}
|
|
],
|
|
"solutions": [
|
|
{
|
|
"lang": "en",
|
|
"supportingMedia": [
|
|
{
|
|
"base64": false,
|
|
"type": "text/html",
|
|
"value": "<p>Upgrade to libreswan 5.3.1 or later. Patches for libreswan 4.15 and 5.3 are available at <a href=\"https://libreswan.org/security/CVE-2026-50722/\">https://libreswan.org/security/CVE-2026-50722/</a></p>"
|
|
}
|
|
],
|
|
"value": "Upgrade to libreswan 5.3.1 or later. Patches for libreswan 4.15 and 5.3 are available at https://libreswan.org/security/CVE-2026-50722/"
|
|
}
|
|
],
|
|
"exploits": [
|
|
{
|
|
"lang": "en",
|
|
"value": "No known exploitation in the wild. The authentication bypass requires the target to use RSA keys with weak exponents (e=3), which have been disallowed by most cryptographic libraries for at least a decade. The denial-of-service attack is exploitable against any IKEv2 configuration using default authby= settings that permit RSA PKCS#1 v1.5 fallback."
|
|
}
|
|
],
|
|
"configurations": [
|
|
{
|
|
"lang": "en",
|
|
"value": "Any server or client that accepts RSA-based IKEv2 connections via the default authby= settings is vulnerable to denial of service. Authentication bypass additionally requires the use of RSA keys with weak exponents (e=3). IKEv2 by default allows ECDSA, RSA-SSA-PSS, and RSA PKCS#1 1.5 as fallback due to Microsoft Windows not supporting RSASSA-PSS."
|
|
}
|
|
],
|
|
"credits": [
|
|
{
|
|
"lang": "en",
|
|
"type": "finder",
|
|
"value": "Yeonghyeon Choi"
|
|
},
|
|
{
|
|
"lang": "en",
|
|
"type": "finder",
|
|
"value": "Duyeong Kim"
|
|
},
|
|
{
|
|
"lang": "en",
|
|
"type": "analyst",
|
|
"value": "Andrew Cagney (The Libreswan Team)"
|
|
}
|
|
],
|
|
"source": {
|
|
"discovery": "EXTERNAL",
|
|
"defects": [
|
|
"CVE-2026-50722"
|
|
]
|
|
},
|
|
"references": [
|
|
{
|
|
"name": "Libreswan Security Advisory CVE-2026-50722",
|
|
"url": "https://libreswan.org/security/CVE-2026-50722/CVE-2026-50722.txt",
|
|
"tags": [
|
|
"vendor-advisory"
|
|
]
|
|
},
|
|
{
|
|
"name": "Libreswan CVE-2026-50722 Patches",
|
|
"url": "https://libreswan.org/security/CVE-2026-50722/",
|
|
"tags": [
|
|
"patch"
|
|
]
|
|
},
|
|
{
|
|
"name": "Related: CVE-2026-50721 (IKEv1 variant)",
|
|
"url": "https://libreswan.org/security/CVE-2026-50721/CVE-2026-50721.txt",
|
|
"tags": [
|
|
"related"
|
|
]
|
|
},
|
|
{
|
|
"name": "RFC 8017 - PKCS #1: RSA Cryptography Specifications Version 2.2",
|
|
"url": "https://www.rfc-editor.org/rfc/rfc8017",
|
|
"tags": [
|
|
"technical-description"
|
|
]
|
|
}
|
|
],
|
|
"timeline": [
|
|
{
|
|
"time": "2026-03-24T00:00:00.000Z",
|
|
"lang": "en",
|
|
"value": "Libreswan notified of the issue via security@libreswan.org"
|
|
},
|
|
{
|
|
"time": "2026-06-16T00:00:00.000Z",
|
|
"lang": "en",
|
|
"value": "Advanced notice given to supported customers and distributions"
|
|
},
|
|
{
|
|
"time": "2026-06-24T00:00:00.000Z",
|
|
"lang": "en",
|
|
"value": "Public announcement and release of libreswan 5.3.1"
|
|
}
|
|
],
|
|
"taxonomyMappings": [
|
|
{
|
|
"taxonomyName": "ATT&CK",
|
|
"taxonomyVersion": "15.1",
|
|
"taxonomyRelations": [
|
|
{
|
|
"taxonomyId": "T1499.004",
|
|
"relationshipName": "maps to",
|
|
"relationshipValue": "Application or System Exploitation (DoS)"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"x_generator": {
|
|
"engine": "cvelib 1.8.0"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"timestamp": "2026-07-06T18:12:19.317302Z",
|
|
"id": "CVE-2026-50722",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "yes"
|
|
},
|
|
{
|
|
"Technical Impact": "partial"
|
|
}
|
|
],
|
|
"role": "CISA Coordinator",
|
|
"version": "2.0.3"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2026-07-07T17:02:06.722Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |