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CVE-2023-40184

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-6474-1
Posted Nov 13, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6474-1 - It was discovered that xrdp incorrectly handled validation of client-supplied data, which could lead to out-of-bounds reads. An attacker could possibly use this issue to crash the program or extract sensitive information. It was discovered that xrdp improperly handled session establishment errors. An attacker could potentially use this issue to bypass the OS-level session restrictions by PAM.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2022-23468, CVE-2022-23478, CVE-2022-23480, CVE-2022-23484, CVE-2022-23613, CVE-2023-40184, CVE-2023-42822
SHA-256 | 80f11e75bf9e200fb554e96ade8114b9c0c6defa3ccbc799491f881b3afd2f6a
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