CVE-2024-31497
Vulnerability from cvelistv5
Published
2024-04-15 00:00
Modified
2024-08-19 07:48
Severity ?
Summary
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. The required set of signed messages may be publicly readable because they are stored in a public Git service that supports use of SSH for commit signing, and the signatures were made by Pageant through an agent-forwarding mechanism. In other words, an adversary may already have enough signature information to compromise a victim's private key, even if there is no further use of vulnerable PuTTY versions. After a key compromise, an adversary may be able to conduct supply-chain attacks on software maintained in Git. A second, independent scenario is that the adversary is an operator of an SSH server to which the victim authenticates (for remote login or file copy), even though this server is not fully trusted by the victim, and the victim uses the same private key for SSH connections to other services operated by other entities. 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.
References
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2024/04/15/6Mailing List, Third Party Advisory
cve@mitre.orghttps://bugzilla.redhat.com/show_bug.cgi?id=2275183Issue Tracking
cve@mitre.orghttps://bugzilla.suse.com/show_bug.cgi?id=1222864Issue Tracking
cve@mitre.orghttps://docs.ccv.brown.edu/oscar/connecting-to-oscar/ssh/ssh-agent-forwarding/key-generation-and-agent-forwarding-with-puttyProduct
cve@mitre.orghttps://filezilla-project.org/versions.phpRelease Notes
cve@mitre.orghttps://git.tartarus.org/?h=c193fe9848f50a88a4089aac647fecc31ae96d27&p=simon/putty.gitMailing List, Patch
cve@mitre.orghttps://github.com/advisories/GHSA-6p4c-r453-8743Third Party Advisory
cve@mitre.orghttps://github.com/daedalus/BreakingECDSAwithLLLThird Party Advisory
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2024/06/msg00014.html
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZS3B37GNGWOOV7QU7B7JFK76U4TOP4V/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MMHILY2K7HQGQRHOC375KRRG2M6625RD/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PUOTQVGC4DISVHQGSPUYGXO6TLDK65LA/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WFDZBV7ZCAZ6AH3VCQ34SSY7L3J7VZXZ/Mailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMJH7M663BVO3SY6MFAW2FAZWLLXAPRQ/Mailing List, Third Party Advisory
cve@mitre.orghttps://news.ycombinator.com/item?id=40044665Issue Tracking
cve@mitre.orghttps://security-tracker.debian.org/tracker/CVE-2024-31497Third Party Advisory
cve@mitre.orghttps://securityonline.info/cve-2024-31497-critical-putty-vulnerability-exposes-private-keys-immediate-action-required/Press/Media Coverage
cve@mitre.orghttps://tartarus.org/~simon/putty-snapshots/htmldoc/Chapter9.html#pageant-forwardProduct
cve@mitre.orghttps://tortoisegit.orgThird Party Advisory
cve@mitre.orghttps://twitter.com/CCBalert/status/1780229237569470549Press/Media Coverage
cve@mitre.orghttps://twitter.com/lambdafu/status/1779969509522133272Press/Media Coverage
cve@mitre.orghttps://winscp.net/eng/news.phpThird Party Advisory
cve@mitre.orghttps://www.bleepingcomputer.com/news/security/putty-ssh-client-flaw-allows-recovery-of-cryptographic-private-keys/Press/Media Coverage
cve@mitre.orghttps://www.chiark.greenend.org.uk/~sgtatham/putty/changes.htmlRelease Notes, Vendor Advisory
cve@mitre.orghttps://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-p521-bias.htmlVendor Advisory
cve@mitre.orghttps://www.openwall.com/lists/oss-security/2024/04/15/6Mailing List, Third Party Advisory
cve@mitre.orghttps://www.reddit.com/r/sysadmin/comments/1c4wmoj/putty_vulnerability_affecting_v068_to_v08/Press/Media Coverage
Impacted products
n/an/a
Show details on NVD website

To clipboard 

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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. Un segundo escenario independiente es que el adversario sea un operador de un servidor SSH en el que la v\u00edctima se autentica (para inicio de sesi\u00f3n remoto o copia de archivos), aunque la v\u00edctima no conf\u00ede plenamente en este servidor y la v\u00edctima utilice la misma clave privada. para conexiones SSH a otros servicios operados por otras entidades. Aqu\u00ed, el operador del servidor fraudulento (que de otro modo no tendr\u00eda forma de determinar la clave privada de la v\u00edctima) puede obtener la clave privada de la v\u00edctima y luego usarla para acceder no autorizado a esos otros servicios. Si los otros servicios incluyen servicios Git, nuevamente es posible realizar ataques a la cadena de suministro del software mantenido en Git. 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  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.