CVE-2021-36367
Vulnerability from cvelistv5
Published
2021-07-09 00:00
Modified
2024-08-04 00:54
Severity ?
EPSS score ?
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
{ containers: { adp: [ { affected: [ { cpes: [ "cpe:2.3:a:putty:putty:-:*:*:*:*:*:*:*", ], defaultStatus: "unknown", product: "putty", vendor: "putty", versions: [ { lessThanOrEqual: "0.75", status: "affected", version: "-", versionType: "custom", }, ], }, ], metrics: [ { cvssV3_1: { 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", }, }, { other: { content: { id: "CVE-2021-36367", options: [ { Exploitation: "none", }, { Automatable: "no", }, { "Technical Impact": "total", }, ], role: "CISA Coordinator", timestamp: "2024-02-22T20:07:50.029818Z", version: "2.0.3", }, type: "ssvc", }, }, ], problemTypes: [ { descriptions: [ { cweId: "CWE-345", description: "CWE-345 Insufficient Verification of Data Authenticity", lang: "en", type: "CWE", }, ], }, ], providerMetadata: { dateUpdated: "2024-06-04T17:13:16.563Z", orgId: "134c704f-9b21-4f2e-91b3-4a467353bcc0", shortName: "CISA-ADP", }, title: "CISA ADP Vulnrichment", }, { providerMetadata: { dateUpdated: "2024-08-04T00:54:51.472Z", orgId: "af854a3a-2127-422b-91ae-364da2661108", shortName: "CVE", }, references: [ { tags: [ "x_transferred", ], url: "https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html", }, { tags: [ "x_transferred", ], url: "https://git.tartarus.org/?p=simon/putty.git%3Ba=commit%3Bh=1dc5659aa62848f0aeb5de7bd3839fecc7debefa", }, { name: "DSA-5588", tags: [ "vendor-advisory", "x_transferred", ], url: "https://www.debian.org/security/2023/dsa-5588", }, { name: "[debian-lts-announce] 20240425 [SECURITY] [DLA 3794-1] putty security update", tags: [ "mailing-list", "x_transferred", ], url: "https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html", }, ], title: "CVE Program Container", }, ], cna: { affected: [ { product: "n/a", vendor: "n/a", versions: [ { status: "affected", version: "n/a", }, ], }, ], 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).", }, ], problemTypes: [ { descriptions: [ { description: "n/a", lang: "en", type: "text", }, ], }, ], providerMetadata: { dateUpdated: "2024-04-25T22:05:53.574730", orgId: "8254265b-2729-46b6-b9e3-3dfca2d5bfca", shortName: "mitre", }, references: [ { url: "https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html", }, { url: "https://git.tartarus.org/?p=simon/putty.git%3Ba=commit%3Bh=1dc5659aa62848f0aeb5de7bd3839fecc7debefa", }, { name: "DSA-5588", tags: [ "vendor-advisory", ], url: "https://www.debian.org/security/2023/dsa-5588", }, { name: "[debian-lts-announce] 20240425 [SECURITY] [DLA 3794-1] putty security update", tags: [ "mailing-list", ], url: "https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html", }, ], }, }, cveMetadata: { assignerOrgId: "8254265b-2729-46b6-b9e3-3dfca2d5bfca", assignerShortName: "mitre", cveId: "CVE-2021-36367", datePublished: "2021-07-09T00:00:00", dateReserved: "2021-07-09T00:00:00", dateUpdated: "2024-08-04T00:54:51.472Z", state: "PUBLISHED", }, dataType: "CVE_RECORD", dataVersion: "5.1", "vulnerability-lookup:meta": { nvd: "{\"cve\":{\"id\":\"CVE-2021-36367\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2021-07-09T21:15:08.540\",\"lastModified\":\"2024-11-21T06:13:36.733\",\"vulnStatus\":\"Modified\",\"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)\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":5.2},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":5.2}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:N/C:P/I:P/A:N\",\"baseScore\":5.8,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":8.6,\"impactScore\":4.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":true}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-345\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-345\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"0.75\",\"matchCriteriaId\":\"1159EB89-B30E-4381-8879-B40F5C935B62\"}]}]}],\"references\":[{\"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\"},{\"url\":\"https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Release Notes\",\"Third Party Advisory\"]},{\"url\":\"https://www.debian.org/security/2023/dsa-5588\",\"source\":\"cve@mitre.org\"},{\"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\"},{\"url\":\"https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Release Notes\",\"Third Party Advisory\"]},{\"url\":\"https://www.debian.org/security/2023/dsa-5588\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}", vulnrichment: { containers: "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.tartarus.org/?p=simon/putty.git%3Ba=commit%3Bh=1dc5659aa62848f0aeb5de7bd3839fecc7debefa\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://www.debian.org/security/2023/dsa-5588\", \"name\": \"DSA-5588\", \"tags\": [\"vendor-advisory\", \"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html\", \"name\": \"[debian-lts-announce] 20240425 [SECURITY] [DLA 3794-1] putty security update\", \"tags\": [\"mailing-list\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T00:54:51.472Z\"}}, {\"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 8.1, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-36367\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-02-22T20:07:50.029818Z\"}}}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:putty:putty:-:*:*:*:*:*:*:*\"], \"vendor\": \"putty\", \"product\": \"putty\", \"versions\": [{\"status\": \"affected\", \"version\": \"-\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"0.75\"}], \"defaultStatus\": \"unknown\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-345\", \"description\": \"CWE-345 Insufficient Verification of Data Authenticity\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-04-29T17:39:23.035Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"affected\": [{\"vendor\": \"n/a\", \"product\": \"n/a\", \"versions\": [{\"status\": \"affected\", \"version\": \"n/a\"}]}], \"references\": [{\"url\": \"https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html\"}, {\"url\": \"https://git.tartarus.org/?p=simon/putty.git%3Ba=commit%3Bh=1dc5659aa62848f0aeb5de7bd3839fecc7debefa\"}, {\"url\": \"https://www.debian.org/security/2023/dsa-5588\", \"name\": \"DSA-5588\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html\", \"name\": \"[debian-lts-announce] 20240425 [SECURITY] [DLA 3794-1] putty security update\", \"tags\": [\"mailing-list\"]}], \"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).\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"n/a\"}]}], \"providerMetadata\": {\"orgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"shortName\": \"mitre\", \"dateUpdated\": \"2024-04-25T22:05:53.574730\"}}}", cveMetadata: "{\"cveId\": \"CVE-2021-36367\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-04T00:54:51.472Z\", \"dateReserved\": \"2021-07-09T00:00:00\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2021-07-09T00:00:00\", \"assignerShortName\": \"mitre\"}", dataType: "CVE_RECORD", dataVersion: "5.1", }, }, }
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Nomenclature
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