CVE-2019-8263 : Security Advisory and Response
Learn about CVE-2019-8263, a stack-based buffer overflow vulnerability in UltraVNC revision 1205, leading to a denial of service (DoS) situation. Find out how to mitigate and prevent this vulnerability.
UltraVNC revision 1205 has a stack-based buffer overflow vulnerability in the VNC client code, specifically in the ShowConnInfo routine, leading to a denial of service (DoS) situation. This CVE requires user interaction to trigger the attack and has been fixed in revision 1206.
Understanding CVE-2019-8263
This CVE involves a vulnerability in UltraVNC that could potentially lead to a DoS situation.
What is CVE-2019-8263?
- The vulnerability exists in the VNC client code of UltraVNC revision 1205, specifically in the ShowConnInfo routine.
- It is a stack-based buffer overflow vulnerability that can result in a denial of service (DoS) condition.
- The attack requires user interaction to be triggered.
The Impact of CVE-2019-8263
- Exploiting this vulnerability could lead to a denial of service (DoS) situation.
- The attack can be carried out through network connectivity but requires user interaction.
Technical Details of CVE-2019-8263
This section provides more technical insights into the vulnerability.
Vulnerability Description
- UltraVNC revision 1205 is susceptible to a stack-based buffer overflow in the VNC client code within the ShowConnInfo routine.
Affected Systems and Versions
- Product: UltraVNC
- Vendor: Kaspersky Lab
- Version: 1.2.2.3
Exploitation Mechanism
- The vulnerability can be exploited through network connectivity but necessitates user interaction to trigger the attack.
Mitigation and Prevention
Here are the steps to mitigate and prevent the exploitation of CVE-2019-8263.
Immediate Steps to Take
- Update UltraVNC to revision 1206 or a version that includes the fix.
- Educate users about the potential risks of interacting with unknown or untrusted VNC connections.
Long-Term Security Practices
- Regularly update and patch all software to the latest versions to address known vulnerabilities.
- Implement network segmentation to limit the impact of potential attacks.
Patching and Updates
- Ensure that all software, including UltraVNC, is regularly updated with the latest security patches to prevent exploitation of known vulnerabilities.