libmspack up to 0.6 CHM Filename mspack/chmd.c Blank Filename input validation

Summaryinfo

A vulnerability has been found in libmspack up to 0.6 and classified as critical. This impacts an unknown function of the file mspack/chmd.c of the component CHM Filename Handler. Performing a manipulation as part of Blank Filename results in input validation. This vulnerability is reported as CVE-2018-14680. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in libmspack up to 0.6. It has been classified as critical. This affects an unknown part of the file mspack/chmd.c of the component CHM Filename Handler. The manipulation as part of a Blank Filename leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. The summary by CVE is:

An issue was discovered in mspack/chmd.c in libmspack before 0.7alpha. It does not reject blank CHM filenames.

The bug was discovered 05/12/2018. The weakness was disclosed 07/28/2018 (Website). It is possible to read the advisory at openwall.com. This vulnerability is uniquely identified as CVE-2018-14680 since 07/28/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. 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 77 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-122308, VDB-122309 and VDB-125323 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• libmspack

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6

License

• open-source

CPE 2.3info

• 🔍
• 🔍
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CPE 2.2info

• 🔍
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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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