Submit #561141: PCMan FTP Server 2.0.7 Buffer Overflow

This technique works well against Windows XP Professional Service Pack 2 and 3.
For this exploit, I tried several strategies to increase the reliability of the Poc - Proof Of Concept.
Sending an excessive amount of data through the "BELL" command, the application crashes, indicating the Buffer Overflow condition.
Then, the offset amount was identified by using msf-pattern_create -l 3000
And then by using msf-pattern_offset -q to discover the offset amount.
After discovering the offset amount, it was necessary to adjust the data in the stack.
To advance in the exploit , mona was used, together with the command !mona jmp -r esp -n to discover a JMP ESP address, in this case it was 0x74e32fd9.
Then I used the removal of the main badchars: 0x00\0x0a\0x0d I did not perform a search for badchars through bytearray, because I already knew the environment I was working in.
Finally, I added 20 nops and generated the shellcode with msfvenom
Successful exploitation of these issues could allow attackers to obtain a remote shell on the system.

• Source: ⚠️ https://fitoxs.com/exploit/exploit-e99a18c428cb38d5f260853678922e03.txt
• User: Fernando Mengali (UID 83791)
• Submission: 04/17/2025 18:10 (1 Year ago)
• Moderation: 05/01/2025 14:44 (14 days later)
• Status: Accepted
• VulDB entry: 306800 [PCMan FTP Server 2.0.7 BELL Command buffer overflow]
• Points: 20