A vulnerability was found in pkgconf 1.5.0/1.5.1/1.5.2. It has been classified as critical. Affected is the function dequote of the component PC File Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

pkgconf version 1.5.0 to 1.5.2 contains a Buffer Overflow vulnerability in dequote() that can result in dequote() function returns 1-byte allocation if initial length is 0, leading to buffer overflow. This attack appear to be exploitable via specially crafted .pc file. This vulnerability appears to have been fixed in 1.5.3.

The bug was discovered 07/29/2018. The weakness was shared 08/20/2018 as confirmed git commit (GIT Repository). The advisory is available at git.dereferenced.org. This vulnerability is traded as CVE-2018-1000221 since 08/20/2018. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 22 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 1.5.3 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.dereferenced.org. The best possible mitigation is suggested to be upgrading to the latest version.

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