The Lotus Domino Web Server contains a flaw that could be exploited to cause a denial of service situation.
Sending a crafted GET request containing numerous unicode characters can trigger a server exception that will crash the Domino server. If qnc.exe is removed from the system, the crash will only affect the web server.
A server exception will crash the Domino server resulting in a denial of service.
Upgrade to Notes/Domino 5.0.7 or later. See <http://www.notes.net/qmrdown.nsf/QMRWelcome>.
Install an application layer filter to detect and block malicious requests.
Vendor| Status| Date Notified| Date Updated
Lotus| | 16 Oct 2000| 12 Jul 2001
If you are a vendor and your product is affected, let us know.
Group | Score | Vector
Base | N/A | N/A
Temporal | N/A | N/A
Environmental | N/A | N/A
Our thanks to Defcom Labs, who published an advisory on this and other problems, available at http://www.securityfocus.com/frames/?content=/templates/advisory.html?id=3208.
This document was written by Jason Rafail and is based on information obtained from a Defcom Labs Advisory.