Vulnerability identifier: #VU14161

Vulnerability risk: Low

CVSSv3.1: 5 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-14680

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

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

Vendor: Stuart Caie

Description

The vulnerability allows a local attacker to cause DoS condition on the target system.

The vulnerability exists due to the chmd_read_headers() function, as defined in the mspack/chmd.c source code file of the affected software, does not reject blank CHM filenames. A local attacker can submit a CHM file with a blank filename and cause the service to crash.

Mitigation
Update to version 0.7.

Vulnerable software versions

libmspack: 0.4 - 0.6

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External links
http://github.com/kyz/libmspack/commit/72e70a921f0f07fee748aec2274b30784e1d312a

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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. However, proof of concept for this vulnerability is available.