libcaca 0.99.beta19 caca/dither.c get_rgba_default integer overflow

Summaryinfo

A vulnerability was found in libcaca 0.99.beta19. It has been rated as critical. Affected by this vulnerability is the function get_rgba_default of the file caca/dither.c. The manipulation leads to integer overflow. This vulnerability is listed as CVE-2018-20546. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, has been found in libcaca 0.99.beta19. This issue affects the function get_rgba_default of the file caca/dither.c. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

There is an illegal READ memory access at caca/dither.c (function get_rgba_default) in libcaca 0.99.beta19 for the default bpp case.

The bug was discovered 12/28/2018. The weakness was presented 12/28/2018 (Website). The advisory is shared at bugzilla.redhat.com. The identification of this vulnerability is CVE-2018-20546 since 12/27/2018. 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 scanner Nessus provides a plugin with the ID 121212 (Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 18.10 : libcaca vulnerabilities (USN-3860-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197344 (Ubuntu Security Notification for Libcaca Vulnerabilities (USN-3860-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (121212). See VDB-128416, VDB-128511, VDB-128512 and VDB-128514 for similar entries. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• libcaca

Version

• 0.99.beta19

License

• open-source

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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