OpenSSL Security Advisory [01 November 2022]

Two high risk security vulnerabilities have been reported which affect OpenSSL versions 3.0 to 3.06. 

The advisory for both may be found here: https://www.openssl.org/news/secadv/20221101.txt 

RedShield customers are protected from exploitation of this vulnerability on all shielded applications.  

X.509 Email Address 4-byte Buffer Overflow (CVE-2022-3602)

Severity: High

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 the malicious certificate or for the application to continue certificate verification despite failure to construct a path to a trusted issuer. An attacker can craft a malicious email address to overflow four attacker-controlled bytes on the stack. This buffer overflow could result in a crash (causing a denial of service) or potentially remote code execution.

X.509 Email Address Variable Length Buffer Overflow (CVE-2022-3786)

Severity: High

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).

RedShield Support

If you have any questions relating to this please contact support@redshield.co.