GEN:SID 1:2428
Message NNTP ihave overflow attempt
Summary This event is generated when an attempt is made to exploit a known
vulnerability in ISC INN Usenet/NNTP server.
Impact Execution of arbitrary code is possible.
Detailed Information A vulnerability exists in the network news transport protocol server
from ISC. It may be possible for a remote attacker to exploit a buffer
overflow condition in the software to execute code of the attackers
choosing with the privileges of the user running the daemon.
Affected Systems ISC INN 2.4 .0
Attack Scenarios An attacker may send specially crafted packets to a vulnerable system to
cause the overflow condition to occur. Once successful the attacker may
attempt to escalate privileges by using further local exploits.
Ease of Attack Moderate.
Corrective Action Upgrade to the latest non-affected version of the software.

Apply the appropriate vendor supplied patches
Additional References  
Rule References bugtraq: 9382
cve: 2004-0045