CVE-2018-15856
First published: Sat Aug 25 2018(Updated: )
An infinite loop when reaching EOL unexpectedly in compose/parser.c (aka the keymap parser) in xkbcommon before 0.8.1 could be used by local attackers to cause a denial of service during parsing of crafted keymap files.
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 | |
| dbus-common | <0.8.1 | |
| Ubuntu Linux | =14.04 | |
| Ubuntu Linux | =16.04 | |
| Ubuntu Linux | =18.04 | |
| 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/842e4351c2c97de6051cab6ce36b4a81e709a0e1
- 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-2018-15856
- https://access.redhat.com/security/cve/cve-2018-15856
- https://bugzilla.redhat.com/show_bug.cgi?id=1623018
- https://security-tracker.debian.org/tracker/CVE-2018-15856
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15856
- https://nvd.nist.gov/vuln/detail/CVE-2018-15856
- https://ubuntu.com/security/CVE-2018-15856
Frequently Asked Questions
What is the severity of CVE-2018-15856?
CVE-2018-15856 is classified as a denial of service vulnerability due to an infinite loop in the xkbcommon keymap parser.
How do I fix CVE-2018-15856?
To fix CVE-2018-15856, update the libxkbcommon package to version 0.8.1 or higher.
Which systems are affected by CVE-2018-15856?
CVE-2018-15856 affects libxkbcommon versions below 0.8.1 on various Linux distributions including Red Hat and Debian.
How can CVE-2018-15856 be exploited?
CVE-2018-15856 can be exploited by local attackers through the use of crafted keymap files that trigger an infinite loop.
What should I do if I cannot update my system to fix CVE-2018-15856?
If you cannot update, consider implementing security controls to limit file access to keymap files from untrusted users.
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