NULL Pointer Dereference Affecting xorg-x11-server-source package, versions <0:1.20.4-7.el7
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-RHEL7-XORGX11SERVERSOURCE-1511991
- published26 Jul 2021
- disclosed26 Jun 2017
Introduced: 26 Jun 2017
CVE-2018-15863 (opens in a new tab)How to fix?
Upgrade RHEL:7 xorg-x11-server-source to version 0:1.20.4-7.el7 or higher.
This issue was patched in RHSA-2019:2079.
NVD Description
Note: Versions mentioned in the description apply only to the upstream xorg-x11-server-source package and not the xorg-x11-server-source package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
Unchecked NULL pointer usage in ResolveStateAndPredicate in xkbcomp/compat.c in xkbcommon before 0.8.2 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap file with a no-op modmask expression.
References
- https://access.redhat.com/security/cve/CVE-2018-15863
- https://security.gentoo.org/glsa/201810-05
- https://github.com/xkbcommon/libxkbcommon/commit/96df3106d49438e442510c59acad306e94f3db4d
- https://lists.freedesktop.org/archives/wayland-devel/2018-August/039243.html
- https://access.redhat.com/errata/RHSA-2019:2079
- https://usn.ubuntu.com/3786-1/
- https://usn.ubuntu.com/3786-2/