qpopper 4.01 with PAM based authentication on Red Hat systems generates different error messages when an invalid username is provided instead of a valid name, which allows remote attackers to determine valid usernames on the system.
Link | Tags |
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http://www.securityfocus.com/bid/3242 | vdb entry patch vendor advisory |
https://exchange.xforce.ibmcloud.com/vulnerabilities/7047 | vdb entry |
http://archives.neohapsis.com/archives/bugtraq/2001-08/0363.html | mailing list exploit vendor advisory |