PuTTY vulnerability vuln-p521-bias

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Home FAQ Feedback Licence Updates Mirrors Keys Links TeamDownload: Stable · Snapshot Docs Changes Wishlistsummary: NIST P521 private keys are exposed by biased signature generationclass: vulnerability: This is a security vulnerability.priority: high: This should be fixed in the next release.absent-in: 0.67present-in: 0.68 0.69 0.70 0.71 0.72 0.73 0.74 0.75 0.76 0.77 0.78 0.79 0.80fixed-in: c193fe9848f50a88a4089aac647fecc31ae96d27 (0.81)Every version of the PuTTY tools from 0.68 to 0.80 inclusive has a critical vulnerability in the code that generates signatures from ECDSA private keys which use the NIST P521 curve. (PuTTY, or Pageant, generates a signature from a key when using it to authenticate you to an SSH server.)This vulnerability has been assigned CVE-2024-31497. It was discovered by Fabian Bäumer and Marcus Brinkmann of the Ruhr University Bochum.The bad news: the effect of the vulnerability is to compromise the private key. An attacker in possession of a…