Debian alert DLA-4166-1 (xrdp)

From:
             
 
Abhijith PA <abhijith@debian.org>
To:
             
 
debian-lts-announce@lists.debian.org
Subject:
             
 
[SECURITY] [DLA 4166-1] xrdp security update
Date:
             
 
Fri, 16 May 2025 20:36:42 +0530
Message-ID:
             
 
<aCdUgoVjFwQh9uVG@debian.org>
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Debian LTS Advisory DLA-4166-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                          Abhijith PA
May 16, 2025                                  https://wiki.debian.org/LTS
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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
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