A security issue and a vulnerability have been reported in UnrealIRCd, which can be exploited by malicious people to cause a DoS (Denial of Service) or compromise a vulnerable system.
1) The security issue is caused due to certain files being distributed via e.g. the project's mirrors containing a backdoor. This can be exploited to e.g. execute arbitrary shell commands by sending specially crafted packets to the service.
Note: The backdoor is reported in the source code file of version 188.8.131.52 (e.g. "Unreal184.108.40.206.tar.gz") with an MD5 checksum of 752e46f2d873c1679fa99de3f52a274d. The MD5 checksum of legitimate copies is 7b741e94e867c0a7370553fd01506c66.
2) A boundary error in the user authentication can be exploited to cause a buffer overflow via an overly long username.
Successful exploitation of this vulnerability requires that "allow::options::noident" is used (not used by default).
Solution: Ensure that you've installed a legitimate copy of UnrealIRCd version 220.127.116.11. Please see the vendor's advisories for additional details.
Provided and/or discovered by: Reported by the vendor.
Original Advisory: http://www.unrealircd.com/txt/unrealsecadvisory.20090413.txt
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Subject: UnrealIRCd Backdoor Security Issue and User Authentication Buffer Overflow
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