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HIGH

libX11: Out of Bounds write in XListExtensions in ListExt.c

Published Aug 24, 2018

Description

An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.

Affected products

Remediation

Red Hat statement

To exploit the vulnerability an attacker would need to have already compromised the X server used by your applications. Normally, the X client that runs libX11 and the X server runs on the same machine, thus if an attacker can trigger this flaw he has already compromised the X server, which runs as root, and he has already full control on the system. If the X client runs on another system than the X server (e.g. DISPLAY environment variable is used and it points to an X server on another system) then exploiting this vulnerability would only gain the privileges of the client, which should not be run with high privileges. For the above reasons, this flaw was rated as Moderate Impact.

Weaknesses (1)

CWE-787

Out-of-bounds Write

References (16)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Aug 24, 2018
Updated Aug 5, 2024
Reserved Jul 26, 2018
Link CVE-2018-14600
CISA Vulnrichment
Updated n/a
NVD
Status Modified
Modified Jun 17, 2026
Link CVE-2018-14600
Red Hat
Severity Moderate
Public date Aug 21, 2018
Links CVE-2018-14600 - Bugzilla
ENISA EUVD
Assigner mitre
Published Aug 24, 2018
Updated Aug 5, 2024
Exploited since n/a
Link EUVD-2018-6507
EUVD-2018-6507