CVE-2023-27538

Name	CVE-2023-27538
Description	An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3398-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
curl (PTS)	buster	7.64.0-4+deb10u2	vulnerable
	buster (security)	7.64.0-4+deb10u9	fixed
	bullseye (security), bullseye	7.74.0-1.3+deb11u11	fixed
	bookworm, bookworm (security)	7.88.1-10+deb12u5	fixed
	trixie	8.5.0-2	fixed
	sid	8.7.1-2	fixed

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

Package	Type	Release	Fixed Version	Origin
curl	source	buster	7.64.0-4+deb10u6	DLA-3398-1
curl	source	bullseye	7.74.0-1.3+deb11u8
curl	source	(unstable)	7.88.1-7

https://curl.se/docs/CVE-2023-27538.html
Fixed by: https://github.com/curl/curl/commit/af369db4d3833272b8ed443f7fcc2e757a0872eb (curl-8_0_0)