Justin Seitz has discovered a vulnerability in Ipswitch WS_FTP Server, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to an error within the FTP Log Server (ftplogsrv.exe) when handling certain messages. This can be exploited to crash a server by sending specially crafted datagrams to the vulnerable service (default port 5151/UDP).
The vulnerability is confirmed in FTP Log Server (ftplogsrv.exe) version 184.108.40.206 included in WS_FTP Server 6. Other versions may also be affected.
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Subject: Ipswitch WS_FTP Server FTP Log Server Denial of Service Vulnerability
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