#VU15814 Infinite loop in libxkbcommon - CVE-2018-15856

Vulnerability identifier: #VU15814

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-2018-15856

CWE-ID: CWE-835

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 an infinite loop condition during insufficient validation of user-supplied input. A local attacker can submit a specially crafted keymap file that submits malicious input, trigger infinite loop 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/842e4351c2c97de6051cab6ce36b4a81e709a0e1

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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.