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RUSTSEC-2022-0065

X.509 Email Address Variable Length Buffer Overflow

Reported
Issued
Package
openssl-src (crates.io)
Type
Vulnerability
Categories
Aliases
References
Patched
  • >=300.0.11
Unaffected
  • <300.0.0

Description

A buffer overrun can be triggered in X.509 certificate verification, specifically in name constraint checking. Note that this occurs after certificate chain signature verification and requires either a CA to have signed a malicious certificate or for an application to continue certificate verification despite failure to construct a path to a trusted issuer. An attacker can craft a malicious email address in a certificate to overflow an arbitrary number of bytes containing the . character (decimal 46) on the stack. This buffer overflow could result in a crash (causing a denial of service).

In a TLS client, this can be triggered by connecting to a malicious server. In a TLS server, this can be triggered if the server requests client authentication and a malicious client connects.

Advisory available under CC0-1.0 license.