A vulnerability was found in Blender 3d Creation Suite 2.78c (Image Processing Software) and classified as critical. Affected by this issue is some unknown functionality of the component Polygon Handler. 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. CVE summarizes:

An exploitable integer overflow exists in the way that the Blender open-source 3d creation suite v2.78c converts curves to polygons. A specially crafted .blend file can cause an integer overflow resulting in a buffer overflow which can allow for code execution under the context of the application. An attacker can convince a user to open the file or use the file as a library in order to trigger this vulnerability.

The bug was discovered 01/11/2018. The weakness was shared 04/24/2018 (Website). The advisory is available at debian.org. This vulnerability is handled as CVE-2017-12102 since 07/31/2017. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available.

The vulnerability was handled as a non-public zero-day exploit for at least 103 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 111140 (Debian DSA-4248-1 : blender - 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 176431 (Debian Security Update for blender (DSA 4248-1)).

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

The vulnerability is also documented in the vulnerability database at Tenable (111140).

Productinfo

Type

• Image Processing Software

Vendor

• Blender

Name

• 3d Creation Suite

Version

• 2.78c

License

• open-source

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