A vulnerability was found in GNU Libextractor up to 1.6. It has been declared as critical. Affected by this vulnerability is the function ec_read_file_func of the file unzip.c. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

GNU Libextractor before 1.7 has a stack-based buffer overflow in ec_read_file_func (unzip.c).

The bug was discovered 07/12/2018. The weakness was presented 07/17/2018 (Website). It is possible to read the advisory at lists.gnu.org. This vulnerability is known as CVE-2018-14346 since 07/17/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 112127 (Debian DLA-1478-1 : libextractor security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176473 (Debian Security Update for libextractor (DSA 4290-1)).

Upgrading to version 1.7 eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (112127). See VDB-121544 and VDB-123554 for similar entries. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• GNU

Name

• Libextractor

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6

License

• open-source

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