{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-40918", "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "state": "PUBLISHED", "assignerShortName": "CPANSec", "dateReserved": "2025-04-16T09:05:34.361Z", "datePublished": "2025-07-16T14:00:12.777Z", "dateUpdated": "2025-08-07T09:08:47.396Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "Authen-SASL", "product": "Authen::SASL::Perl::DIGEST_MD5", "programFiles": ["DIGEST_MD5.pm"], "repo": "https://github.com/gbarr/perl-authen-sasl", "vendor": "EHUELS", "versions": [{"lessThanOrEqual": "2.1800", "status": "affected", "version": "2.04", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<div>Authen::SASL::Perl::DIGEST_MD5 versions 2.04 through 2.1800 for Perl generates the cnonce insecurely.</div><div>The cnonce (client nonce) is generated from an MD5 hash of the PID, the epoch time and the built-in rand function. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.</div><div>According to RFC 2831, <q>The cnonce-value is an opaque quoted string value provided by the client and used by both client and server to avoid chosen plaintext attacks, and to provide mutual authentication. The security of the implementation\n depends on a good choice. It is RECOMMENDED that it contain at least 64 bits of entropy.</q></div>"}], "value": "Authen::SASL::Perl::DIGEST_MD5 versions 2.04 through 2.1800 for Perl generates the cnonce insecurely.\n\nThe cnonce (client nonce) is generated from an MD5 hash of the PID, the epoch time and the built-in rand function. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.\n\nAccording to RFC 2831, The cnonce-value is an opaque quoted string value provided by the client and used by both client and server to avoid chosen plaintext attacks, and to provide mutual authentication. The security of the implementation\n depends on a good choice. It is RECOMMENDED that it contain at least 64 bits of entropy."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-340", "description": "CWE-340 Generation of Predictable Numbers or Identifiers", "lang": "en", "type": "CWE"}, {"cweId": "CWE-338", "description": "CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "shortName": "CPANSec", "dateUpdated": "2025-08-07T09:08:47.396Z"}, "references": [{"url": "https://metacpan.org/release/EHUELS/Authen-SASL-2.1900/changes"}, {"url": "https://metacpan.org/dist/Authen-SASL/source/lib/Authen/SASL/Perl/DIGEST_MD5.pm#L263"}, {"url": "https://datatracker.ietf.org/doc/html/rfc2831"}, {"tags": ["patch"], "url": "https://security.metacpan.org/patches/A/Authen-SASL/2.1800/CVE-2025-40918-r1.patch"}, {"tags": ["issue-tracking"], "url": "https://github.com/gbarr/perl-authen-sasl/pull/22"}], "solutions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<div>Users should upgrade to version 2.1900 or later.</div>"}], "value": "Users should upgrade to version 2.1900 or later."}], "source": {"discovery": "UNKNOWN"}, "title": "Authen::SASL::Perl::DIGEST_MD5 versions 2.04 through 2.1800 for Perl generates the cnonce insecurely", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2025-07-16T20:48:38.205622Z", "id": "CVE-2025-40918", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"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": "2025-07-16T20:48:52.853Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Authen::SASL::Perl::DIGEST_MD5 versions 2.04 through 2.1800 for Perl generates the cnonce insecurely.\n\nThe cnonce (client nonce) is generated from an MD5 hash of the PID, the epoch time and the built-in rand function. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.\n\nAccording to RFC 2831, The cnonce-value is an opaque quoted string value provided by the client and used by both client and server to avoid chosen plaintext attacks, and to provide mutual authentication. The security of the implementation\n depends on a good choice. It is RECOMMENDED that it contain at least 64 bits of entropy."}, {"lang": "es", "value": "Authen::SASL::Perl::DIGEST_MD5, versiones 2.04 a 2.1800 para Perl, genera el cnonce de forma insegura. El cnonce (nonce del cliente) se genera a partir de un hash MD5 del PID, la fecha de la \u00e9poca y la funci\u00f3n rand integrada. El PID se obtendr\u00e1 de un peque\u00f1o conjunto de n\u00fameros, y la fecha de la \u00e9poca puede ser inferida si no se filtra del encabezado HTTP Date. La funci\u00f3n rand integrada no es adecuada para uso criptogr\u00e1fico. Seg\u00fan la RFC 2831, el valor cnonce es una cadena opaca entre comillas proporcionada por el cliente y utilizada tanto por el cliente como por el servidor para evitar ataques de texto plano y proporcionar autenticaci\u00f3n mutua. La seguridad de la implementaci\u00f3n depende de una buena elecci\u00f3n. Se recomienda que contenga al menos 64 bits de entrop\u00eda."}], "id": "CVE-2025-40918", "lastModified": "2025-08-07T10:15:36.860", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2025-07-16T14:15:25.350", "references": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://datatracker.ietf.org/doc/html/rfc2831"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://github.com/gbarr/perl-authen-sasl/pull/22"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://metacpan.org/dist/Authen-SASL/source/lib/Authen/SASL/Perl/DIGEST_MD5.pm#L263"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://metacpan.org/release/EHUELS/Authen-SASL-2.1900/changes"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://security.metacpan.org/patches/A/Authen-SASL/2.1800/CVE-2025-40918-r1.patch"}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-338"}, {"lang": "en", "value": "CWE-340"}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary"}]}

{"bugzilla": {"description": "authen-sasl: Authen::SASL::Perl::DIGEST_MD5 insecure cnonce generation", "id": "2380942", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2380942"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "(CWE-338|CWE-340)", "details": ["A client nonce (cnonce) generation flaw has been discovered in Authen::SASL::Perl::DIGEST_MD5. The cnonce is generated from an MD5 hash of the PID, the epoch time, and the built-in rand function. The PID will come from a small set of numbers, and the epoch time may be guessed if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2025-40918", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "perl-Authen-SASL", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "perl-Authen-SASL", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "perl-Authen-SASL", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "perl-Authen-SASL", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "perl-Authen-SASL", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-07-16T14:00:12Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40918\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40918\nhttps://datatracker.ietf.org/doc/html/rfc2831\nhttps://github.com/gbarr/perl-authen-sasl/pull/22\nhttps://metacpan.org/dist/Authen-SASL/source/lib/Authen/SASL/Perl/DIGEST_MD5.pm#L263\nhttps://security.metacpan.org/patches/A/Authen-SASL/2.1800/CVE-2025-40918-r1.patch"], "threat_severity": "Moderate"}