GEN:SID 1:1920
Message FTP SITE NEWER overflow attempt
Summary This event is generated when an attempt is made to exploit a vulnerability associated with the FTP SITE NEWER command that may cause a denial of service or allow the upload of executable files.
Impact Remote access or denial of service.  A successful attack can cause a denial of service or allow the upload of executable files on the vulnerable FTP server.
Detailed Information This event is generated when an attempt is made to exploit a vulnerability associated with the WU-FTP server version of the SITE NEWER command. It is possible to cause a denial of service attack that consumes memory or upload files to execute arbitrary commands with the privileges of the process running the FTP server.
Affected Systems Hosts running WU-FTPD 2.5.0.  
Attack Scenarios An attacker can cause a denial of service or upload files to execute arbitrary commands on the vulnerable FTP server.
Ease of Attack Difficult.  No known exploits available.
Corrective Action Upgrade to the latest non-affected version of the software.
Additional References Bugtraq:
http://www.securityfocus.com/bid/737
Rule References bugtraq: 229
cve: 1999-0800