Description
Solar FTP Server fails to properly handle format strings passed to the USER command. When a specially crafted string containing format specifiers is sent, the server crashes due to a read access violation in the __output_1() function of sfsservice.exe. This results in a denial of service (DoS) condition.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Flexbyte Software | Solar FTP Server | ≤ 2.1.1 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Metasploit 1 module
-
Solar FTP Server Malformed USER Denial of Service
auxiliary/dos/windows/ftp/solarftp_user
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/dos/windows/ftp/solarftp_user.rb exploit
- https://www.exploit-db.com/exploits/16204 exploit
- https://web.archive.org/web/20111102141514/https://solarftp.com/ product
- https://web.archive.org/web/20111009122553/http://solarftp.com/blog/news/solar-ftp-server-2-1-2.html vendor-advisory patch
- https://www.vulncheck.com/advisories/solar-ftp-server-malformed-user-dos third-party-advisory