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CVE-2023-40184— Improper handling of session establishment errors in xrdp

Quick assessment

Affected
neutrinolabs xrdp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

xrdp是Neutrinolabs实验室的一款开源远程桌面协议服务器。 xrdp 0.9.23之前版本存在安全漏洞，该漏洞源于 xrdp-sesman 内部处理不当，导致会话限制被绕过。

CVSS 2.6 · Low EPSS 0.73% · P51

Possible ATT&CK Techniques 2 AI

T1078 · Valid Accounts T1562
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I. Basic Information for CVE-2023-40184

Vulnerability Information
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Vulnerability Title
Improper handling of session establishment errors in xrdp
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件的处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
xrdp 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
xrdp是Neutrinolabs实验室的一款开源远程桌面协议服务器。 xrdp 0.9.23之前版本存在安全漏洞，该漏洞源于 xrdp-sesman 内部处理不当，导致会话限制被绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
neutrinolabs xrdp < 0.9.23 -

II. Public POCs for CVE-2023-40184

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III. Intelligence Information for CVE-2023-40184

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Patches & Fixes for CVE-2023-40184 (1)

Vendor Advisories for CVE-2023-40184 (1)

Mailing List Discussions for CVE-2023-40184 (3)

Other References for CVE-2023-40184 (1)

IV. Related Vulnerabilities

Same product: xrdp
Same vendor: neutrinolabs
Same weakness: CWE-755

V. Comments for CVE-2023-40184

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