[FD] Grawlix 1.0.3: Code Execution

Security Advisory - Curesec Research Team 1. Introduction Affected Product: Grawlix 1.0.3 Fixed in: not fixed Fixed Version Link: n/a Vendor Website: http://ift.tt/1Yxrde6 Vulnerability Type: Code Execution Remote Exploitable: Yes Reported to vendor: 11/17/2015 Disclosed to public: 12/21/2015 Release mode: Full Disclosure CVE: n/a Credits Tim Coen of Curesec GmbH 2. Overview CVSS High 9.0 AV:N/AC:L/Au:S/C:C/I:C/A:C Description Grawlix is a CMS for publishing comics, which is written in PHP. When uploading an image icon for a link, neither the file type nor the file extension are checked, leading to code execution. It should be noted that admin credentials are required to upload an icon, and that because of a bug when uploading icons, the upload only works if Grawlix is installed in the root directory. 3. Proof of Concept