CoKi has reported a vulnerability in Citadel/UX, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially compromise a vulnerable system.
The vulnerability is caused due to boundary error within the citadel service when processing "USER" commands. This can be exploited to cause a stack-based buffer overflow by passing an overly long argument (about 94 bytes) to the "USER" command.
Successful exploitation may allow execution of arbitrary code.
The vulnerability has been reported in version 6.23 and prior.
Solution: A patch is available in the CVS repository and will be included in the next release.
Provided and/or discovered by: CoKi
Original Advisory: http://www.nosystem.com.ar/advisories/advisory-04.txt
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