CVE-2000-0453: Medium severity Xfree86 Project X11r6 vulnerability
XFree86 3.3.x and 4.0 allows a user to cause a denial of service via a negative counter value in a malformed TCP packet that is sent to port 6000.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Remove
Remove
XFree86 X Serverfrom your environment.Uninstall XFree86 X Server if it is not required on the system to eliminate exposure.
- Configuration
Disable the X server from accepting TCP connections so it does not listen on port 6000 (prevent incoming TCP packets to the X server).
XFree86 X Server TCP listening = disabled - Compensating control
Block or restrict TCP access to port 6000 at the network perimeter and host-based firewalls (allow only trusted hosts or deny access entirely) to prevent malformed packets from reaching the X server.
Event History
Frequently Asked Questions
What is the severity of CVE-2000-0453?
CVE-2000-0453 is classified as a denial of service vulnerability.
How do I fix CVE-2000-0453?
To fix CVE-2000-0453, update to the latest version of XFree86 that addresses the vulnerability.
Which versions are affected by CVE-2000-0453?
CVE-2000-0453 affects XFree86 versions 3.3.5, 3.3.6, and 4.0.
Can CVE-2000-0453 be exploited remotely?
Yes, CVE-2000-0453 can be exploited remotely by sending malformed TCP packets to port 6000.
What systems are vulnerable to CVE-2000-0453?
Systems running vulnerable versions of XFree86 X Server are at risk of CVE-2000-0453.