Vulnerabilities > CVE-2023-40184 - Improper Handling of Exceptional Conditions vulnerability in Neutrinolabs Xrdp
Attack vector
NETWORK Attack complexity
LOW Privileges required
LOW Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
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.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
References
- https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-f489-557v-47jq
- https://github.com/neutrinolabs/xrdp/commit/a111a0fdfe2421ef600e40708b5f0168594cfb23
- https://github.com/neutrinolabs/xrdp/blame/9bbb2ec68f390504c32f2062847aa3d821a0089a/sesman/sesexec/session.c#L571C5-L571C19
- https://lists.fedoraproject.org/archives/list/[email protected]/message/U5IXMQODV3OIJ7DRQBUQV7PUKNT7SH36/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/SOT237TIHTHPX5YNIWLVNINOEYC7WMG2/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/URO3FKTFBPNKFARAQBEJLI4MH6YS35P5/