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FreeBSD: VID-C9FF1150-5D63-11EE-BBAE-1C61B4739AC9 (CVE-2023-40184): xrdp -- Improper handling of session establishment errors allows bypassing OS-level session restrictions

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FreeBSD: VID-C9FF1150-5D63-11EE-BBAE-1C61B4739AC9 (CVE-2023-40184): xrdp -- Improper handling of session establishment errors allows bypassing OS-level session restrictions

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
08/30/2023
Created
09/30/2023
Added
09/28/2023
Modified
09/28/2023

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.

Solution(s)

  • freebsd-upgrade-package-xrdp

References

  • CVE-2023-40184

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