Title: Ipswitch WS_FTP Server 'STAT' Buffer Overflow Vulnerability
Severity: CRITICAL
Description:
WS_FTP Server, a popular FTP server for Microsoft Windows platforms, is vulnerable to a buffer overflow condition when a user submits a specially crafted legitimate FTP command. WS_FTP Server by default runs as a SYSTEM service.
The buffer overflow condition is exploitable when submitting the 'STAT' command. The 'STAT' command is used when a user requires the status of an operation in progress, the server will send a status response in the form of a reply.
If a logged in user submits a 'STAT' command along with arbitrary characters (approx 479 bytes) to a host running WS_FTP Server, this could result in the overwriting of stack variables, including the return address, and potentially the execution of arbitrary code with SYSTEM privileges.
It should be noted that the target buffer contains set variables that may vary from system to system. These variables have to be taken into consideration when attempting to overwrite stack variables and specifying the return address.
Successful exploitation of this vulnerability could lead to a complete compromise of the target host.
Affected Products:
- Ipswitch WS FTP Server 1.0.1
- Ipswitch WS FTP Server 1.0.2
- Ipswitch WS FTP Server 1.0.3
- Ipswitch WS FTP Server 1.0.4
- Ipswitch WS FTP Server 1.0.5
- Ipswitch WS FTP Server 2.0.0
- Ipswitch WS FTP Server 2.0.1
- Ipswitch WS FTP Server 2.0.2
- Ipswitch WS FTP Server 2.0.3
References:
- IPSwitch: WS FTP Server Support Homepage
- Ipswitch: WS_FTP Server 2.0.4 Upgrade Information
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