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CVE-2023-3138

Status Candidate

Overview

A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.

Related Files

Red Hat Security Advisory 2023-7029-01
Posted Nov 15, 2023
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2023-7029-01 - An update for libX11 is now available for Red Hat Enterprise Linux 8. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow
systems | linux, redhat
advisories | CVE-2023-3138
SHA-256 | 447164a193df5540fd8b76b86bd489e01cb94e26da736efe2a8fc6df793ec2db
Red Hat Security Advisory 2023-6497-01
Posted Nov 13, 2023
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2023-6497-01 - An update for libX11 is now available for Red Hat Enterprise Linux 9. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow
systems | linux, redhat
advisories | CVE-2023-3138
SHA-256 | 0d211b39acba6895c476f4fef45f1daf9511ddb2ef337703181beaab2e8c3a67
Debian Security Advisory 5433-1
Posted Jun 21, 2023
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5433-1 - Gregory James Duck reported that missing input validation in various functions provided by libx11, the X11 client-side library, may result in denial of service.

tags | advisory, denial of service
systems | linux, debian
advisories | CVE-2023-3138
SHA-256 | 99cc65c1ad12a278a4a4e25bf0b90ba31d13ff5fd3f7e054cbc9ea208033a4a4
Ubuntu Security Notice USN-6168-2
Posted Jun 21, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6168-2 - USN-6168-1 fixed a vulnerability in libx11. This update provides the corresponding update for Ubuntu 14.04 ESM, Ubuntu 16.04 ESM, and Ubuntu 18.04 ESM. Gregory James Duck discovered that libx11 incorrectly handled certain Request, Event, or Error IDs. If a user were tricked into connecting to a malicious X Server, a remote attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2023-3138
SHA-256 | cfbed00d12ce5e17e808411a3087316dc771868a1016244059c6b0aef5d4d9c7
Ubuntu Security Notice USN-6168-1
Posted Jun 16, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6168-1 - Gregory James Duck discovered that libx11 incorrectly handled certain Request, Event, or Error IDs. If a user were tricked into connecting to a malicious X Server, a remote attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2023-3138
SHA-256 | fb33b3eca8869ce783b685384acb922fd56dd96e3d27a63f58e05c1b89544187
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