PCMan FTP Server Buffer Overflow Vulnerability in SIZE Command Handler

A critical buffer overflow vulnerability has been identified in PCMan FTP Server version 2.0.7. This issue arises in the SIZE command handler, where unknown code is susceptible to remote exploitation. The vulnerability has been publicly disclosed and is actively exploitable.

Impact

Exploitation of this vulnerability leads to a buffer overflow, which can commonly result in arbitrary code execution or causing a crash, depending on how the overflow is handled.

Reproduction

The vulnerability can be reproduced by sending a crafted SIZE command that includes a payload designed to overflow the buffer. This can be done using a FTP client or a script that automates the process. The payload should be carefully crafted to include the desired shellcode and overwrite the return address with a location that will execute the shellcode, such as a JMP ESP instruction.