Ubuntu alert USN-6407-1 (libx11)

From:
             
 
Marc Deslauriers <marc.deslauriers@canonical.com>
To:
             
 
"ubuntu-security-announce@lists.ubuntu.com" <ubuntu-security-announce@lists.ubuntu.com>
Subject:
             
 
[USN-6407-1] libx11 vulnerabilities
Date:
             
 
Tue, 03 Oct 2023 15:40:12 -0400
Message-ID:
             
 
<0040aa1e-67c4-cf26-c076-eef03cae9634@canonical.com>
==========================================================================
Ubuntu Security Notice USN-6407-1
October 03, 2023

libx11 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.04
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in libx11.

Software Description:
- libx11: X11 client-side library

Details:

Gregory James Duck discovered that libx11 incorrectly handled certain
keyboard symbols. If a user were tricked into connecting to a malicious X
server, a remote attacker could use this issue to cause libx11 to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2023-43785)

Yair Mizrahi discovered that libx11 incorrectly handled certain malformed
XPM image files. If a user were tricked into opening a specially crafted
XPM image file, a remote attacker could possibly use this issue to consume
memory, leading to a denial of service. (CVE-2023-43786)

Yair Mizrahi discovered that libx11 incorrectly handled certain malformed
XPM image files. If a user were tricked into opening a specially crafted
XPM image file, a remote attacker could use this issue to cause libx11 to
crash, leading to a denial of service, or possibly execute arbitrary code.
(CVE-2023-43787)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 23.04:
   libx11-6                        2:1.8.4-2ubuntu0.3

Ubuntu 22.04 LTS:
   libx11-6                        2:1.7.5-1ubuntu0.3

Ubuntu 20.04 LTS:
   libx11-6                        2:1.6.9-2ubuntu1.6

After a standard system update you need to reboot your computer to make all
the necessary changes.

References:
   https://ubuntu.com/security/notices/USN-6407-1
   CVE-2023-43785, CVE-2023-43786, CVE-2023-43787

Package Information:
   https://launchpad.net/ubuntu/+source/libx11/2:1.8.4-2ubun...
   https://launchpad.net/ubuntu/+source/libx11/2:1.7.5-1ubun...
   https://launchpad.net/ubuntu/+source/libx11/2:1.6.9-2ubun...