CVE-2022-3786

Name	CVE-2022-3786
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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
openssl (PTS)	bullseye	1.1.1w-0+deb11u1	fixed
	bullseye (security)	1.1.1w-0+deb11u2	fixed
	bookworm	3.0.15-1~deb12u1	fixed
	bookworm (security)	3.0.14-1~deb12u2	fixed
	sid, trixie	3.3.2-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version
openssl	source	buster	(not affected)
openssl	source	bullseye	(not affected)
openssl	source	(unstable)	3.0.7-1

Notes

[bullseye] - openssl <not-affected> (Only affects 3.x)
[buster] - openssl <not-affected> (Only affects 3.x)
https://www.openssl.org/news/secadv/20221101.txt
https://www.openssl.org/blog/blog/2022/11/01/email-address-overflows/
https://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=c42165b5706e42f67ef8ef4c351a9a4c5d21639a (openssl-3.0.7)