==========================================================================
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/libx11/2:1.8.4-2ubuntu0.3
   https://launchpad.net/ubuntu/+source/libx11/2:1.7.5-1ubuntu0.3
   https://launchpad.net/ubuntu/+source/libx11/2:1.6.9-2ubuntu1.6

Ubuntu 6407-1: libx11 vulnerabilities

October 3, 2023
Several security issues were fixed in libx11.

Summary

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

Severity
Ubuntu Security Notice USN-6407-1

Package Information

https://launchpad.net/ubuntu/+source/libx11/2:1.8.4-2ubuntu0.3 https://launchpad.net/ubuntu/+source/libx11/2:1.7.5-1ubuntu0.3 https://launchpad.net/ubuntu/+source/libx11/2:1.6.9-2ubuntu1.6

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