gsd-2024-31497
Vulnerability from gsd
Modified
2024-04-11 05:03
Details
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.
Aliases


To clipboard 

{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2024-31497"
      ],
      "details": "In PuTTY 0.68 through 0.80 before 0.81, biased ECDSA nonce generation allows an attacker to recover a user\u0027s 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\u0027s 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\u0027s private key) can derive the victim\u0027s 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.",
      "id": "GSD-2024-31497",
      "modified": "2024-04-11T05:03:20.811992Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@mitre.org",
        "ID": "CVE-2024-31497",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "n/a",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "n/a"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "n/a"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "In PuTTY 0.68 through 0.80 before 0.81, biased ECDSA nonce generation allows an attacker to recover a user\u0027s 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\u0027s 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\u0027s private key) can derive the victim\u0027s 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."
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html",
            "refsource": "MISC",
            "url": "https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html"
          },
          {
            "name": "https://filezilla-project.org/versions.php",
            "refsource": "MISC",
            "url": "https://filezilla-project.org/versions.php"
          },
          {
            "name": "https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-p521-bias.html",
            "refsource": "CONFIRM",
            "url": "https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-p521-bias.html"
          },
          {
            "name": "https://www.openwall.com/lists/oss-security/2024/04/15/6",
            "refsource": "MISC",
            "url": "https://www.openwall.com/lists/oss-security/2024/04/15/6"
          },
          {
            "name": "https://tartarus.org/~simon/putty-snapshots/htmldoc/Chapter9.html#pageant-forward",
            "refsource": "MISC",
            "url": "https://tartarus.org/~simon/putty-snapshots/htmldoc/Chapter9.html#pageant-forward"
          },
          {
            "name": "https://docs.ccv.brown.edu/oscar/connecting-to-oscar/ssh/ssh-agent-forwarding/key-generation-and-agent-forwarding-with-putty",
            "refsource": "MISC",
            "url": "https://docs.ccv.brown.edu/oscar/connecting-to-oscar/ssh/ssh-agent-forwarding/key-generation-and-agent-forwarding-with-putty"
          },
          {
            "name": "https://news.ycombinator.com/item?id=40044665",
            "refsource": "MISC",
            "url": "https://news.ycombinator.com/item?id=40044665"
          },
          {
            "name": "https://winscp.net/eng/news.php",
            "refsource": "MISC",
            "url": "https://winscp.net/eng/news.php"
          },
          {
            "name": "https://tortoisegit.org",
            "refsource": "MISC",
            "url": "https://tortoisegit.org"
          },
          {
            "name": "https://github.com/advisories/GHSA-6p4c-r453-8743",
            "refsource": "MISC",
            "url": "https://github.com/advisories/GHSA-6p4c-r453-8743"
          },
          {
            "name": "https://bugzilla.redhat.com/show_bug.cgi?id=2275183",
            "refsource": "MISC",
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2275183"
          },
          {
            "name": "https://bugzilla.suse.com/show_bug.cgi?id=1222864",
            "refsource": "MISC",
            "url": "https://bugzilla.suse.com/show_bug.cgi?id=1222864"
          },
          {
            "name": "https://security-tracker.debian.org/tracker/CVE-2024-31497",
            "refsource": "MISC",
            "url": "https://security-tracker.debian.org/tracker/CVE-2024-31497"
          },
          {
            "name": "https://twitter.com/lambdafu/status/1779969509522133272",
            "refsource": "MISC",
            "url": "https://twitter.com/lambdafu/status/1779969509522133272"
          },
          {
            "name": "https://git.tartarus.org/?h=c193fe9848f50a88a4089aac647fecc31ae96d27\u0026p=simon/putty.git",
            "refsource": "MISC",
            "url": "https://git.tartarus.org/?h=c193fe9848f50a88a4089aac647fecc31ae96d27\u0026p=simon/putty.git"
          },
          {
            "name": "https://www.reddit.com/r/sysadmin/comments/1c4wmoj/putty_vulnerability_affecting_v068_to_v08/",
            "refsource": "MISC",
            "url": "https://www.reddit.com/r/sysadmin/comments/1c4wmoj/putty_vulnerability_affecting_v068_to_v08/"
          },
          {
            "name": "https://github.com/daedalus/BreakingECDSAwithLLL",
            "refsource": "MISC",
            "url": "https://github.com/daedalus/BreakingECDSAwithLLL"
          },
          {
            "name": "https://www.bleepingcomputer.com/news/security/putty-ssh-client-flaw-allows-recovery-of-cryptographic-private-keys/",
            "refsource": "MISC",
            "url": "https://www.bleepingcomputer.com/news/security/putty-ssh-client-flaw-allows-recovery-of-cryptographic-private-keys/"
          },
          {
            "name": "https://twitter.com/CCBalert/status/1780229237569470549",
            "refsource": "MISC",
            "url": "https://twitter.com/CCBalert/status/1780229237569470549"
          },
          {
            "name": "https://securityonline.info/cve-2024-31497-critical-putty-vulnerability-exposes-private-keys-immediate-action-required/",
            "refsource": "MISC",
            "url": "https://securityonline.info/cve-2024-31497-critical-putty-vulnerability-exposes-private-keys-immediate-action-required/"
          },
          {
            "name": "FEDORA-2024-8401d42de6",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WMJH7M663BVO3SY6MFAW2FAZWLLXAPRQ/"
          },
          {
            "name": "FEDORA-2024-ff9a2fb31c",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MMHILY2K7HQGQRHOC375KRRG2M6625RD/"
          },
          {
            "name": "FEDORA-2024-0489e7ba1e",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IZS3B37GNGWOOV7QU7B7JFK76U4TOP4V/"
          },
          {
            "name": "FEDORA-2024-08a4a5ead8",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WFDZBV7ZCAZ6AH3VCQ34SSY7L3J7VZXZ/"
          },
          {
            "name": "FEDORA-2024-cba85cc558",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PUOTQVGC4DISVHQGSPUYGXO6TLDK65LA/"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "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\u0027s 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\u0027s 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\u0027s private key) can derive the victim\u0027s 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. 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. Esto tambi\u00e9n afecta, por ejemplo, a FileZilla anterior a 3.67.0, WinSCP anterior a 6.3.3, TortoiseGit anterior a 2.15.0.1 y TortoiseSVN hasta 1.14.6."
          }
        ],
        "id": "CVE-2024-31497",
        "lastModified": "2024-04-26T02:15:06.197",
        "metrics": {},
        "published": "2024-04-15T20:15:11.077",
        "references": [
          {
            "source": "cve@mitre.org",
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2275183"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://bugzilla.suse.com/show_bug.cgi?id=1222864"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://docs.ccv.brown.edu/oscar/connecting-to-oscar/ssh/ssh-agent-forwarding/key-generation-and-agent-forwarding-with-putty"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://filezilla-project.org/versions.php"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://git.tartarus.org/?h=c193fe9848f50a88a4089aac647fecc31ae96d27\u0026p=simon/putty.git"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://github.com/advisories/GHSA-6p4c-r453-8743"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://github.com/daedalus/BreakingECDSAwithLLL"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZS3B37GNGWOOV7QU7B7JFK76U4TOP4V/"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MMHILY2K7HQGQRHOC375KRRG2M6625RD/"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PUOTQVGC4DISVHQGSPUYGXO6TLDK65LA/"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WFDZBV7ZCAZ6AH3VCQ34SSY7L3J7VZXZ/"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMJH7M663BVO3SY6MFAW2FAZWLLXAPRQ/"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://news.ycombinator.com/item?id=40044665"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://security-tracker.debian.org/tracker/CVE-2024-31497"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://securityonline.info/cve-2024-31497-critical-putty-vulnerability-exposes-private-keys-immediate-action-required/"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://tartarus.org/~simon/putty-snapshots/htmldoc/Chapter9.html#pageant-forward"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://tortoisegit.org"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://twitter.com/CCBalert/status/1780229237569470549"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://twitter.com/lambdafu/status/1779969509522133272"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://winscp.net/eng/news.php"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://www.bleepingcomputer.com/news/security/putty-ssh-client-flaw-allows-recovery-of-cryptographic-private-keys/"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-p521-bias.html"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://www.openwall.com/lists/oss-security/2024/04/15/6"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://www.reddit.com/r/sysadmin/comments/1c4wmoj/putty_vulnerability_affecting_v068_to_v08/"
          }
        ],
        "sourceIdentifier": "cve@mitre.org",
        "vulnStatus": "Awaiting Analysis"
      }
    }
  }
}


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