Vulnerability CVE-2022-23967


Published: 2022-01-26

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.

Type:

CWE-787

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.5/10
6.4/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Tightvnc -> Tightvnc 

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

Copyright 2024, cxsecurity.com

 

Back to Top