{"id":"CVE-2025-40923","state":"PUBLISHED","title":"Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely","description":"Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely.\n\nThe default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. 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\nPredicable session ids could allow an attacker to gain access to systems.","publishedAt":"2025-07-16T13:05:03.782Z","updatedAt":"2025-11-04T21:10:20.704Z","severity":{"score":7.3,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","source":"CISA-ADP"},"assigner":"CPANSec","products":["MIYAGAWA Plack::Middleware::Session"],"affected":[{"vendor":"MIYAGAWA","product":"Plack::Middleware::Session","packageName":"Plack-Middleware-Session","defaultStatus":"unaffected","versions":[{"version":"0.01","status":"affected","lessThan":"0.35","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","programFiles":["lib/Plack/Session/State.pm"],"repo":"https://github.com/plack/Plack-Middleware-Session"}],"references":["https://metacpan.org/release/MIYAGAWA/Plack-Middleware-Session-0.34/source/lib/Plack/Session/State.pm#L22","https://github.com/plack/Plack-Middleware-Session/pull/52","https://github.com/plack/Plack-Middleware-Session/commit/1fbfbb355e34e7f4b3906f66cf958cedadd2b9be.patch","https://security.metacpan.org/docs/guides/random-data-for-security.html","http://www.openwall.com/lists/oss-security/2025/07/16/4"],"weaknesses":["CWE-340","CWE-338"],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/40xxx/CVE-2025-40923.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40923","state":"PUBLISHED","datePublished":"2025-07-16T13:05:03.782Z","dateUpdated":"2025-11-04T21:10:20.704Z","assignerShortName":"CPANSec","assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateReserved":"2025-04-16T09:05:34.362Z"},"containers":{"cna":{"title":"Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely","descriptions":[{"lang":"en","value":"Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely.\n\nThe default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. 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\nPredicable session ids could allow an attacker to gain access to systems."}],"affected":[{"vendor":"MIYAGAWA","product":"Plack::Middleware::Session","packageName":"Plack-Middleware-Session","defaultStatus":"unaffected","versions":[{"version":"0.01","status":"affected","lessThan":"0.35","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","programFiles":["lib/Plack/Session/State.pm"],"repo":"https://github.com/plack/Plack-Middleware-Session"}],"references":[{"url":"https://metacpan.org/release/MIYAGAWA/Plack-Middleware-Session-0.34/source/lib/Plack/Session/State.pm#L22"},{"url":"https://github.com/plack/Plack-Middleware-Session/pull/52"},{"url":"https://github.com/plack/Plack-Middleware-Session/commit/1fbfbb355e34e7f4b3906f66cf958cedadd2b9be.patch","tags":["patch"]},{"url":"https://security.metacpan.org/docs/guides/random-data-for-security.html"}],"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":{"shortName":"CPANSec","orgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateUpdated":"2025-07-16T13:05:03.782Z"},"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<div>Users are advised to upgrade to Plack-Middleware-Session v0.35 or later.</div>"}],"value":"Users are advised to upgrade to Plack-Middleware-Session v0.35 or later."}],"source":{"discovery":"UNKNOWN"},"workarounds":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<div>Users who are unable to upgrade are advised to change the sid_generator attribute of Plack::Session::State to a function that returns a securely generated session id based on a secure source of entropy from the system.</div>"}],"value":"Users who are unable to upgrade are advised to change the sid_generator attribute of Plack::Session::State to a function that returns a securely generated session id based on a secure source of entropy from the system."}],"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.3,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","integrityImpact":"LOW","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"NONE","confidentialityImpact":"LOW"}},{"other":{"type":"ssvc","content":{"timestamp":"2025-07-16T20:47:49.157521Z","id":"CVE-2025-40923","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-07-16T20:48:17.516Z"}},{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2025/07/16/4"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-04T21:10:20.704Z"}}]}}}