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.

CVSS v3.0 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3.0 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.5^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://www.tightvnc.com/licensing-server-x11.php	Vendor Advisory
https://github.com/MaherAzzouzi/CVE-2022-23967	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:tightvnc:tightvnc:1.3.10:*:*:*:*:*:*:*

Information

Published : 2022-01-26 21:15

Updated : 2022-02-02 23:06

NVD link : CVE-2022-23967

Mitre link : CVE-2022-23967

JSON object : View

Products Affected

tightvnc

tightvnc

CWE

CWE-787

Out-of-bounds Write

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