CVE-2019-8261 Explained : Impact and Mitigation
Learn about CVE-2019-8261, a vulnerability in UltraVNC revision 1199 allowing an out-of-bounds read due to a multiplication overflow. Find out how to mitigate this issue and prevent potential exploitation.
UltraVNC revision 1199 has a vulnerability that allows an out-of-bounds read due to a multiplication overflow in the VNC code of the client CoRRE decoder. This CVE was published on March 1, 2019, and affects version 1.2.2.3 of UltraVNC.
Understanding CVE-2019-8261
This CVE identifies a specific vulnerability in UltraVNC that could be exploited by an attacker through network connectivity.
What is CVE-2019-8261?
The vulnerability in UltraVNC revision 1199 allows for an out-of-bounds read due to a multiplication overflow in the VNC code of the client CoRRE decoder.
The Impact of CVE-2019-8261
The vulnerability could be exploited by an attacker to potentially execute malicious code or gather sensitive information from the affected system.
Technical Details of CVE-2019-8261
UltraVNC revision 1199 is susceptible to an out-of-bounds read vulnerability in the VNC code within the client CoRRE decoder.
Vulnerability Description
The vulnerability is caused by a multiplication overflow, leading to an out-of-bounds read in the client CoRRE decoder of UltraVNC revision 1199.
Affected Systems and Versions
- Product: UltraVNC
- Vendor: UltraVNC
- Vulnerable Version: 1.2.2.3
Exploitation Mechanism
The vulnerability can be exploited by an attacker through network connectivity, potentially allowing unauthorized access to the system.
Mitigation and Prevention
It is crucial to take immediate steps to address and prevent exploitation of this vulnerability.
Immediate Steps to Take
- Update UltraVNC to revision 1200 or a later version that contains the fix for this vulnerability.
- Monitor network traffic for any suspicious activity that could indicate exploitation attempts.
Long-Term Security Practices
- Regularly update software and systems to ensure the latest security patches are applied.
- Implement network segmentation and access controls to limit the impact of potential attacks.
Patching and Updates
Ensure that all systems running UltraVNC are patched with the latest updates to mitigate the risk of exploitation.