#VU15753 Input validation error in libxkbcommon - CVE-2018-15853

Vulnerability identifier: #VU15753

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-15853

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
libxkbcommon
Universal components / Libraries / Libraries used by multiple products

Vendor: xkbcommon

Description

The vulnerability allows a local attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to endless recursion exists in xkbcomp/expr.c during insufficient validation of user-supplied input. A local attacker can supply a specially crafted keymap file, trigger boolean negation and cause the application to crash.

Mitigation
Update to version 0.8.1.

Vulnerable software versions

libxkbcommon: 0.2 - 0.8

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External links
https://github.com/xkbcommon/libxkbcommon/commit/1f9d1248c07cda8aaff762429c0dce146de8632a

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.