In PuTTY 0.68 up to and including 0.80 prior to 0.81, biased ECDSA nonce generation allows an malicious user 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 prior to 3.67.0, WinSCP prior to 6.3.3, TortoiseGit prior to 2.15.0.1, and TortoiseSVN up to and including 1.14.6.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
|---|---|---|
putty putty |
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filezilla-project filezilla client |
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winscp winscp |
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tortoisegit tortoisegit |
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tigris tortoisesvn |
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fedoraproject fedora 38 |
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fedoraproject fedora 39 |
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fedoraproject fedora 40 |
Citrix warns admins to manually mitigate PuTTY SSH client bug By Sergiu Gatlan May 9, 2024 03:27 PM 0 Citrix notified customers this week to manually mitigate a PuTTY SSH client vulnerability that could allow attackers to steal a XenCenter admin's private SSH key. XenCenter helps manage Citrix Hypervisor environments from a Windows desktop, including deploying and monitoring virtual machines. The security flaw (tracked as CVE-2024-31497) impacts multiple versions of XenCenter for Citrix Hypervis...
PuTTY SSH client flaw allows recovery of cryptographic private keys By Bill Toulas April 16, 2024 11:01 AM 0 A vulnerability tracked as CVE-2024-31497 in PuTTY 0.68 through 0.80 could potentially allow attackers with access to 60 cryptographic signatures to recover the private key used for their generation. PuTTY is a popular open-source terminal emulator, serial console, and network file transfer application that supports SSH (Secure Shell), Telnet, SCP (Secure Copy Protocol), and SFTP (SSH Fil...
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