CVE-2023-40184

Publication date 30 August 2023

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
xrdp	24.04 LTS noble	Needs evaluation
	23.10 mantic	Ignored
	23.04 lunar	Ignored
	22.04 LTS jammy	Fixed 0.9.17-2ubuntu2+esm1 Ubuntu Pro
	20.04 LTS focal	Fixed 0.9.12-1ubuntu0.1+esm1 Ubuntu Pro
	18.04 LTS bionic	Fixed 0.9.5-2ubuntu0.1~esm2 Ubuntu Pro
	16.04 LTS xenial	Fixed 0.6.1-2ubuntu0.3+esm3 Ubuntu Pro
	14.04 LTS trusty	Fixed 0.6.0-1ubuntu0.1+esm3 Ubuntu Pro

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Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-6474-1
xrdp vulnerabilities
8 November 2023