CVE-2023-40184

Improper handling of session establishment errors in xrdp

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.

Category

2.6
CVSS
Severity: Low
CVSS 3.1 •
EPSS 0.08%
Vendor Advisory github.com
Affected: neutrinolabs xrdp
Published at:
Updated at:

References

Link Tags
https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-f489-557v-47jq vendor advisory
https://github.com/neutrinolabs/xrdp/commit/a111a0fdfe2421ef600e40708b5f0168594cfb23 patch
https://github.com/neutrinolabs/xrdp/blame/9bbb2ec68f390504c32f2062847aa3d821a0089a/sesman/sesexec/session.c#L571C5-L571C19 product
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U5IXMQODV3OIJ7DRQBUQV7PUKNT7SH36/ mailing list
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SOT237TIHTHPX5YNIWLVNINOEYC7WMG2/ mailing list
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/URO3FKTFBPNKFARAQBEJLI4MH6YS35P5/ mailing list

Frequently Asked Questions

What is the severity of CVE-2023-40184?
CVE-2023-40184 has been scored as a low severity vulnerability.
How to fix CVE-2023-40184?
To fix CVE-2023-40184, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-40184 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-40184 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-40184?
CVE-2023-40184 affects neutrinolabs xrdp.
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