#VU80197 Security features bypass in xrdp - CVE-2023-40184

Vulnerability identifier: #VU80197

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-40184

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
xrdp
Other software / Other software solutions

Vendor: neutrinolabs

Description

The vulnerability allows a remote user to bypass implemented security restrictions.

The vulnerability exists due to improper handling of session restrictions inside the xrdp-sesman. A remote user can bypass session restrictions, such as max concurrent sessions per user enforced by PAM.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

xrdp: 0.6.0 - 0.9.22.1

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External links
https://github.com/neutrinolabs/xrdp/releases/tag/v0.9.23
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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.