{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2024-31497", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2024-06-20T19:05:59.509465", "dateReserved": "2024-04-04T00:00:00", "datePublished": "2024-04-15T00:00:00"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2024-06-20T19:05:59.509465"}, "descriptions": [{"lang": "en", "value": "In PuTTY 0.68 through 0.80 before 0.81, biased ECDSA nonce generation allows an attacker to recover a user's NIST P-521 secret key via a quick attack in approximately 60 signatures. This is especially important in a scenario where an adversary is able to read messages signed by PuTTY or Pageant. 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Here, the rogue server operator (who would otherwise have no way to determine the victim's private key) can derive the victim's private key, and then use it for unauthorized access to those other services. If the other services include Git services, then again it may be possible to conduct supply-chain attacks on software maintained in Git. This also affects, for example, FileZilla before 3.67.0, WinSCP before 6.3.3, TortoiseGit before 2.15.0.1, and TortoiseSVN through 1.14.6."}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html"}, {"url": "https://filezilla-project.org/versions.php"}, {"url": "https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-p521-bias.html"}, {"url": "https://www.openwall.com/lists/oss-security/2024/04/15/6"}, {"url": "https://tartarus.org/~simon/putty-snapshots/htmldoc/Chapter9.html#pageant-forward"}, {"url": "https://docs.ccv.brown.edu/oscar/connecting-to-oscar/ssh/ssh-agent-forwarding/key-generation-and-agent-forwarding-with-putty"}, {"url": "https://news.ycombinator.com/item?id=40044665"}, {"url": "https://winscp.net/eng/news.php"}, {"url": "https://tortoisegit.org"}, {"url": "https://github.com/advisories/GHSA-6p4c-r453-8743"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2275183"}, {"url": "https://bugzilla.suse.com/show_bug.cgi?id=1222864"}, {"url": "https://security-tracker.debian.org/tracker/CVE-2024-31497"}, {"url": "https://twitter.com/lambdafu/status/1779969509522133272"}, {"url": "https://git.tartarus.org/?h=c193fe9848f50a88a4089aac647fecc31ae96d27&p=simon/putty.git"}, {"url": "https://www.reddit.com/r/sysadmin/comments/1c4wmoj/putty_vulnerability_affecting_v068_to_v08/"}, {"url": "https://github.com/daedalus/BreakingECDSAwithLLL"}, {"url": "https://www.bleepingcomputer.com/news/security/putty-ssh-client-flaw-allows-recovery-of-cryptographic-private-keys/"}, {"url": "https://twitter.com/CCBalert/status/1780229237569470549"}, {"url": "https://securityonline.info/cve-2024-31497-critical-putty-vulnerability-exposes-private-keys-immediate-action-required/"}, {"name": "FEDORA-2024-8401d42de6", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMJH7M663BVO3SY6MFAW2FAZWLLXAPRQ/"}, {"name": "FEDORA-2024-ff9a2fb31c", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MMHILY2K7HQGQRHOC375KRRG2M6625RD/"}, {"name": "FEDORA-2024-0489e7ba1e", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZS3B37GNGWOOV7QU7B7JFK76U4TOP4V/"}, {"name": "FEDORA-2024-08a4a5ead8", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WFDZBV7ZCAZ6AH3VCQ34SSY7L3J7VZXZ/"}, {"name": "FEDORA-2024-cba85cc558", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PUOTQVGC4DISVHQGSPUYGXO6TLDK65LA/"}, {"name": "[oss-security] 20240415 CVE-2024-31497: Secret Key Recovery of NIST P-521 Private Keys Through Biased ECDSA Nonces in PuTTY Client", "tags": ["mailing-list"], "url": "http://www.openwall.com/lists/oss-security/2024/04/15/6"}, {"name": "[debian-lts-announce] 20240620 [SECURITY] [DLA 3839-1] putty security update", "tags": ["mailing-list"], "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00014.html"}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-31497", "role": "CISA Coordinator", "options": [{"Exploitation": "None"}, {"Automatable": "No"}, {"Technical Impact": "Partial"}], "version": "2.0.3", "timestamp": "2024-04-19T04:01:10.059065Z"}}}], "affected": [{"cpes": ["cpe:2.3:a:putty:putty:-:*:*:*:*:*:*:*"], "vendor": "putty", "product": "putty", "versions": [{"status": "affected", "version": "0.68", "lessThan": "0.81", "versionType": "semver"}], "defaultStatus": "unknown"}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:37:17.161Z"}}]}, "dataVersion": "5.1"}

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Here, the rogue server operator (who would otherwise have no way to determine the victim's private key) can derive the victim's private key, and then use it for unauthorized access to those other services. If the other services include Git services, then again it may be possible to conduct supply-chain attacks on software maintained in Git. This also affects, for example, FileZilla before 3.67.0, WinSCP before 6.3.3, TortoiseGit before 2.15.0.1, and TortoiseSVN through 1.14.6."}, {"lang": "es", "value": "En PuTTY 0.68 a 0.80 antes de 0.81, la generaci\u00f3n nonce ECDSA sesgada permite a un atacante recuperar la clave secreta NIST P-521 de un usuario mediante un ataque r\u00e1pido en aproximadamente 60 firmas. Esto es especialmente importante en un escenario en el que un adversario puede leer mensajes firmados por PuTTY o Pageant. El conjunto requerido de mensajes firmados puede ser legible p\u00fablicamente porque est\u00e1n almacenados en un servicio p\u00fablico Git que admite el uso de SSH para la firma de confirmaci\u00f3n, y Pageant realiz\u00f3 las firmas a trav\u00e9s de un mecanismo de reenv\u00edo de agentes. En otras palabras, es posible que un adversario ya tenga suficiente informaci\u00f3n de firma para comprometer la clave privada de una v\u00edctima, incluso si no se utilizan m\u00e1s versiones vulnerables de PuTTY. Despu\u00e9s de un compromiso clave, un adversario puede realizar ataques a la cadena de suministro del software mantenido en Git. 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