A vulnerability classified as critical has been found in The Sleuth Kit up to 4.6.1. Affected is the function tsk_UTF16toUTF8 of the file libtskbase.a. The manipulation as part of a Unicode leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in libtskbase.a in The Sleuth Kit (TSK) from release 4.0.2 through to 4.6.1. An out-of-bounds read of a memory region was found in the function tsk_UTF16toUTF8 in tsk/base/tsk_unicode.c which could be leveraged by an attacker to disclose information or manipulated to read from unmapped memory causing a denial of service attack.

The bug was discovered 06/03/2018. The weakness was disclosed 06/05/2018 (Website). The advisory is available at github.com. This vulnerability is traded as CVE-2018-11740 since 06/05/2018. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277688 (Fedora Security Update for sleuthkit (FEDORA-2018-7270b39f50)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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• The Sleuth Kit

Version

• 4.6.0
• 4.6.1

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