IRC connection tracking helper module in the netfilter subsystem for
Linux 2.4.18-pre9 and earlier does not properly set the mask for
conntrack expectations for incoming DCC connections, which could allow
remote attackers to bypass intended firewall restrictions.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
BUGTRAQ:20020227 security advisory linux 2.4.x ip_conntrack_irc
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