CVE-2022-23967 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://www.tightvnc.com/licensing-server-x11.php https://github.com/MaherAzzouzi/CVE-2022-23967

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8