A vulnerability classified as problematic has been found in Less Compiler. Affected is some unknown functionality of the file Less.js of the component Javascript Compiler. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability.

The bug was discovered 03/18/2016. The weakness was released 11/24/2016 with RedTeam Pentesting GmbH as [RT-SA-2016-003] Less.js: Compilation of Untrusted LESS Files May Lead to Code Execution through the JavaScript Less Compiler as confirmed mailinglist post (Full-Disclosure). The advisory is shared for download at seclists.org. The public release was coordinated with the vendor. The exploitability is told to be easy. The attack needs to be approached locally. A authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability was handled as a non-public zero-day exploit for at least 251 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 3.0 eliminates this vulnerability.

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• Less Compiler

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