CVE-2023-40184

Name	CVE-2023-40184
Description	xrdp is an open source remote desktop protocol (RDP) server. In versions prior to 0.9.23 improper handling of session establishment errors allows bypassing OS-level session restrictions. The `auth_start_session` function can return non-zero (1) value on, e.g., PAM error which may result in in session restrictions such as max concurrent sessions per user by PAM (ex ./etc/security/limits.conf) to be bypassed. Users (administrators) don't use restrictions by PAM are not affected. This issue has been addressed in release version 0.9.23. Users are advised to upgrade. There are no known workarounds for this issue.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1051061

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
xrdp (PTS)	bullseye (security), bullseye	0.9.21.1-1~deb11u1	vulnerable
	bookworm	0.9.21.1-1	vulnerable
	sid, trixie	0.10.1-3	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
xrdp	source	experimental	0.9.24-1
xrdp	source	(unstable)	0.9.24-2			1051061

Notes

[bookworm] - xrdp <no-dsa> (Minor issue)
[bullseye] - xrdp <no-dsa> (Minor issue)
[buster] - xrdp <no-dsa> (Minor issue)
https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-f489-557v-47jq
https://github.com/neutrinolabs/xrdp/commit/25a1fab5b6c5ef2a8bb109232b765cb8b332ce5e