CVE-2018-15857: Use After Free
First published: Sat Aug 25 2018(Updated: )
An invalid free in ExprAppendMultiKeysymList in xkbcomp/ast-build.c in xkbcommon before 0.8.1 could be used by local attackers to crash xkbcommon keymap parsers or possibly have unspecified other impact by supplying a crafted keymap file.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/libxkbcommon | <0.8.1 | 0.8.1 |
| debian/libxkbcommon | 1.0.3-2 1.5.0-1 1.6.0-1 | |
| libxkbcommon-dev | <0.8.1 | |
| dbus-common | <0.8.1 | |
| Ubuntu Linux | =14.04 | |
| Ubuntu Linux | =16.04 | |
| Ubuntu Linux | =18.04 | |
| Ubuntu Libxkbcommon0 | <0.8.1 | |
| Ubuntu | =14.04 | |
| Ubuntu | =16.04 | |
| Ubuntu | =18.04 |
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Reference Links
- https://access.redhat.com/errata/RHSA-2019:2079
- https://github.com/xkbcommon/libxkbcommon/commit/c1e5ac16e77a21f87bdf3bc4dea61b037a17dddb
- https://lists.freedesktop.org/archives/wayland-devel/2018-August/039232.html
- https://security.gentoo.org/glsa/201810-05
- https://usn.ubuntu.com/3786-1/
- https://usn.ubuntu.com/3786-2/
- https://launchpad.net/bugs/cve/CVE-2018-15857
- https://access.redhat.com/security/cve/cve-2018-15857
- https://bugzilla.redhat.com/show_bug.cgi?id=1623022
- https://security-tracker.debian.org/tracker/CVE-2018-15857
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15857
- https://nvd.nist.gov/vuln/detail/CVE-2018-15857
- https://ubuntu.com/security/CVE-2018-15857
Frequently Asked Questions
What is the severity of CVE-2018-15857?
CVE-2018-15857 is considered of medium severity as it can be exploited to crash xkbcommon keymap parsers.
How do I fix CVE-2018-15857?
To fix CVE-2018-15857, upgrade libxkbcommon to version 0.8.1 or later for affected Red Hat systems, or to versions 1.0.3-2, 1.5.0-1, or 1.6.0-1 for Debian systems.
Who is affected by CVE-2018-15857?
CVE-2018-15857 affects local users running systems with versions of libxkbcommon prior to 0.8.1.
What type of vulnerability is CVE-2018-15857?
CVE-2018-15857 is a memory management vulnerability due to an invalid free operation in the libxkbcommon library.
Can CVE-2018-15857 lead to remote attacks?
CVE-2018-15857 is primarily a local vulnerability and does not directly allow for remote attacks.
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