TightVNC Vulnerability.

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Security related resources CVE-2022-23967
Overview

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.

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Comments
  • CVE-2022-23967 duplicate of CVE-2019-15679?

    CVE-2022-23967 duplicate of CVE-2019-15679?

    @MaherAzzouzi, while triaging the issue assigned as CVE-2022-23967:

    Is this not a duplicate of CVE-2019-15679? For details on CVE-2019-15679 see

    • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15679
    • in particular https://www.openwall.com/lists/oss-security/2018/12/10/5 The last reference as well mentions from the reporter back then that upstream did decline to patch the 1.x version. Were you able to contact upstream about your issue? Is it the same as the one reported by Pavel Cheremushkin?
    opened by carnil 2
Owner
MaherAzzouzi
Binary Analysis / Reverse engineering / Exploit development. Analyzing binaries on a daily basis.
MaherAzzouzi
GitHub
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