CVE-2022-3786: fedoraproject fedora Classic Buffer Overflow

Vulnerability summary

CVE-2022-3786 is a high (CVSS 7.5) Classic Buffer Overflow vulnerability in fedoraproject fedora. EPSS estimates a 92.49% chance of exploitation in the next 30 days, higher than 99.8% of scored vulnerabilities.

Timeline

1. 01-11-2022
   PublishedVulnerability first disclosed.
2. 14-04-2026
   Last modifiedVulnerability information updated.

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.

• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.