Nytro Posted January 26, 2022 Report Posted January 26, 2022 CVE-2022-23967 In TightVNC 1.3.10, there is an integer signedness error and resultant heap-based buffer overflow in InitialiseRFBConnection in rfbproto.c (for the vncviewer component). There is no check on the size given to malloc, e.g., -1 is accepted. This allocates a chunk of size zero, which will give a heap pointer. However, one can send 0xffffffff bytes of data, which can have a DoS impact or lead to remote code execution. [Vulnerability Type] Buffer Overflow [Vendor of Product] TightVNC [Affected Product Code Base] vncviewer - 1.3.10 [Affected Component] file : rfbproto.c, function : InitialiseRFBConnection , line of code : 307 [Attack Type] Remote [Impact Denial of Service] true [Attack Vectors] You just need to setup a fake server, to interact with the vulnerable client. [Discoverer] Maher Azzouzi [Reference] https://www.tightvnc.com/licensing-server-x11.php Use CVE-2022-23967. Sursa: https://github.com/MaherAzzouzi/CVE-2022-23967 Quote
