libmspack up to 0.6 CHM Compression mspack/chmd.c TOLOWER calculation

Summaryinfo

A vulnerability was found in libmspack up to 0.6. It has been classified as critical. Affected by this vulnerability is the function TOLOWER of the file mspack/chmd.c of the component CHM Compression. The manipulation leads to calculation. This vulnerability is traded as CVE-2018-14682. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in libmspack up to 0.6. It has been rated as critical. This issue affects the function TOLOWER of the file mspack/chmd.c of the component CHM Compression. The manipulation with an unknown input leads to a calculation vulnerability. Using CWE to declare the problem leads to CWE-682. The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in mspack/chmd.c in libmspack before 0.7alpha. There is an off-by-one error in the TOLOWER() macro for CHM decompression.

The bug was discovered 02/07/2018. The weakness was shared 07/28/2018 (Website). The advisory is shared at openwall.com. The identification of this vulnerability is CVE-2018-14682 since 07/28/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 171 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 111521 (Debian DSA-4260-1 : libmspack - 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 171684 (SUSE Enterprise Linux Security Update for clamav (SUSE-SU-2018:3441-1)).

Upgrading to version 0.7alpha eliminates this vulnerability. A possible mitigation has been published 6 days after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (111521). The entries VDB-122306, VDB-122307, VDB-122308 and VDB-125323 are related to this item. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• libmspack

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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