fkie_cve-2021-36367
Vulnerability from fkie_nvd
Published
2021-07-09 21:15
Modified
2024-11-21 06:13
Severity ?
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Summary
PuTTY through 0.75 proceeds with establishing an SSH session even if it has never sent a substantive authentication response. This makes it easier for an attacker-controlled SSH server to present a later spoofed authentication prompt (that the attacker can use to capture credential data, and use that data for purposes that are undesired by the client user).
References
{ configurations: [ { nodes: [ { cpeMatch: [ { criteria: "cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:*", matchCriteriaId: "1159EB89-B30E-4381-8879-B40F5C935B62", versionEndIncluding: "0.75", vulnerable: true, }, ], negate: false, operator: "OR", }, ], }, ], cveTags: [], descriptions: [ { lang: "en", value: "PuTTY through 0.75 proceeds with establishing an SSH session even if it has never sent a substantive authentication response. This makes it easier for an attacker-controlled SSH server to present a later spoofed authentication prompt (that the attacker can use to capture credential data, and use that data for purposes that are undesired by the client user).", }, { lang: "es", value: "PuTTY versiones hasta 0.75, procede con establecer una sesión SSH incluso si nunca ha enviado una respuesta de autenticación sustantiva. Esto facilita a un servidor SSH controlado por un atacante presentar una petición de autenticación falsa posterior (que el atacante puede usar para capturar los datos de las credenciales, y usar esos datos para fines no deseados por el usuario cliente)", }, ], id: "CVE-2021-36367", lastModified: "2024-11-21T06:13:36.733", metrics: { cvssMetricV2: [ { acInsufInfo: false, baseSeverity: "MEDIUM", cvssData: { accessComplexity: "MEDIUM", accessVector: "NETWORK", authentication: "NONE", availabilityImpact: "NONE", baseScore: 5.8, confidentialityImpact: "PARTIAL", integrityImpact: "PARTIAL", vectorString: "AV:N/AC:M/Au:N/C:P/I:P/A:N", version: "2.0", }, exploitabilityScore: 8.6, impactScore: 4.9, obtainAllPrivilege: false, obtainOtherPrivilege: false, obtainUserPrivilege: false, source: "nvd@nist.gov", type: "Primary", userInteractionRequired: true, }, ], cvssMetricV31: [ { cvssData: { attackComplexity: "LOW", attackVector: "NETWORK", availabilityImpact: "NONE", baseScore: 8.1, baseSeverity: "HIGH", confidentialityImpact: "HIGH", integrityImpact: "HIGH", privilegesRequired: "NONE", scope: "UNCHANGED", userInteraction: "REQUIRED", vectorString: "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N", version: "3.1", }, exploitabilityScore: 2.8, impactScore: 5.2, source: "nvd@nist.gov", type: "Primary", }, { cvssData: { attackComplexity: "LOW", attackVector: "NETWORK", availabilityImpact: "NONE", baseScore: 8.1, baseSeverity: "HIGH", confidentialityImpact: "HIGH", integrityImpact: "HIGH", privilegesRequired: "NONE", scope: "UNCHANGED", userInteraction: "REQUIRED", vectorString: "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N", version: "3.1", }, exploitabilityScore: 2.8, impactScore: 5.2, source: "134c704f-9b21-4f2e-91b3-4a467353bcc0", type: "Secondary", }, ], }, published: "2021-07-09T21:15:08.540", references: [ { source: "cve@mitre.org", url: "https://git.tartarus.org/?p=simon/putty.git%3Ba=commit%3Bh=1dc5659aa62848f0aeb5de7bd3839fecc7debefa", }, { source: "cve@mitre.org", url: "https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html", }, { source: "cve@mitre.org", tags: [ "Release Notes", "Third Party Advisory", ], url: "https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html", }, { source: "cve@mitre.org", url: "https://www.debian.org/security/2023/dsa-5588", }, { source: "af854a3a-2127-422b-91ae-364da2661108", url: "https://git.tartarus.org/?p=simon/putty.git%3Ba=commit%3Bh=1dc5659aa62848f0aeb5de7bd3839fecc7debefa", }, { source: "af854a3a-2127-422b-91ae-364da2661108", url: "https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html", }, { source: "af854a3a-2127-422b-91ae-364da2661108", tags: [ "Release Notes", "Third Party Advisory", ], url: "https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html", }, { source: "af854a3a-2127-422b-91ae-364da2661108", url: "https://www.debian.org/security/2023/dsa-5588", }, ], sourceIdentifier: "cve@mitre.org", vulnStatus: "Modified", weaknesses: [ { description: [ { lang: "en", value: "CWE-345", }, ], source: "nvd@nist.gov", type: "Primary", }, { description: [ { lang: "en", value: "CWE-345", }, ], source: "134c704f-9b21-4f2e-91b3-4a467353bcc0", type: "Secondary", }, ], }
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