Overview:
LSsec has discovered a vulnerability in Computer Associates BrightStor ARCserve Backup, which could be exploited by an anonymous attacker in order to execute arbitrary code with SYSTEM privileges on an affected system. The flaw specifically exists within the Message Engine (msgeng.exe) due to incorrect handling of RPC requests on TCP port 6503. The interface is identified by
dc246bf0-7a7a-11ce-9f88-00805fe43838. Opnum 45 specifies the vulnerable operation within this interface.

Advisory:

http://www.lssec.com/advisories/LS-20060330.pdf