Symantec’s AntiVirus 9 Corporate Edition security software can be used by unauthorised users to take control of company servers.
A flaw reported on the Bugtraq security mailing list, and acknowledged by Symantec, allows local attackers to view server log-in usernames and passwords in clear text.
The information is posted to a log file generated by AntiVirus 9 as it connects to and downloads updates from Symantec's LiveUpdate system.
The log also includes the server name, the IP address, the subnet and subnet mask, as well as the connection protocol.
Symantec said it is aware of the problem and is investigating the matter.