Vulnerability identifier: #VU14159

Vulnerability risk: Low

CVSSv3.1: 7.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-14681

CWE-ID: CWE-121

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 gain elevated privileges on the target system.

The vulnerability exists due to stack-based buffer overflow in the kwajd_read_headers function, as defined in the mspack/kwajd.c source code file. A local attacker can send a specially crafted request that submits malicious input, trigger memory corruption and cause the service to crash or execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

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/0b0ef9344255ff5acfac6b7af09198ac9c9756c8

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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.