Description
Sysax Multi Server versions prior to 5.55 contain a stack-based buffer overflow in its SSH service. When a remote attacker supplies an overly long username during authentication, the server copies the input to a fixed-size stack buffer without proper bounds checking. This allows remote code execution under the context of the service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Sysax Software | Multi Server | < 5.55 | 5.55 |
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
-
Sysax 5.53 SSH Username Buffer Overflow
exploit/windows/ssh/sysax_ssh_username
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/exploits/windows/ssh/sysax_ssh_username.rb exploit
- https://www.exploit-db.com/exploits/18535 exploit
- https://www.exploit-db.com/exploits/18557 exploit
- https://web.archive.org/web/20120302203344/http://www.pwnag3.com/2012/02/sysax-multi-server-ssh-username-exploit.html technical-description exploit
- https://advisories.checkpoint.com/defense/advisories/public/2012/cpai-23-sepc.html third-party-advisory
- https://www.sysax.com/ product
- https://www.vulncheck.com/advisories/sysax-multi-server-ssh-username-buffer-overflow third-party-advisory