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Debian dla-4166 : xrdp - security update

critical Nessus Plugin ID 236872

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4166 advisory.

 - ------------------------------------------------------------------------- Debian LTS Advisory DLA-4166-1 [email protected] https://www.debian.org/lts/security/ Abhijith PA May 16, 2025 https://wiki.debian.org/LTS
 - -------------------------------------------------------------------------

 Package : xrdp Version : 0.9.21.1-1~deb11u2 CVE ID : CVE-2023-40184 CVE-2023-42822 CVE-2024-39917

 Several vulnerabilities were discovered in xrdp, a Remote Desktop Protocol (RDP) server


 CVE-2023-40184

 improper handling of session establishment errors allows bypassing OS-level session restrictions. The `auth_start_session` function can return non-zero on PAM error which may result in in session restrictions such as max concurrent sessions per user by PAM.

 CVE-2023-42822

 Access to the font glyphs in xrdp_painter.c is not bounds-checked . Since some of this data is controllable by the user, this can result in an out-of-bounds read within the xrdp executable. The vulnerability allows an out-of-bounds read within a potentially privileged process.

 CVE-2024-39917

 a vulnerability that allows attackers to make an infinite number of login attempts. The number of max login attempts is supposed to be limited by a configuration parameter `MaxLoginRetry` in `/etc/xrdp/sesman.ini`. However, this mechanism was not effectively working. As a result, xrdp allows an infinite number of login attempts.

 For Debian 11 bullseye, these problems have been fixed in version 0.9.21.1-1~deb11u2.

 We recommend that you upgrade your xrdp packages.

 For the detailed security status of xrdp please refer to its security tracker page at:
 https://security-tracker.debian.org/tracker/xrdp

 Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the xrdp packages.

See Also

https://security-tracker.debian.org/tracker/source-package/xrdp

https://security-tracker.debian.org/tracker/CVE-2023-40184

https://security-tracker.debian.org/tracker/CVE-2023-42822

https://security-tracker.debian.org/tracker/CVE-2024-39917

https://packages.debian.org/source/bullseye/xrdp

Plugin Details

Severity: Critical

ID: 236872

File Name: debian_DLA-4166.nasl

Version: 1.1

Type: local

Agent: unix

Published: 5/16/2025

Updated: 5/16/2025

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2024-39917

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:xrdp

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 5/16/2025

Vulnerability Publication Date: 8/30/2023

Reference Information

CVE: CVE-2023-40184, CVE-2023-42822, CVE-2024-39917