CVE-2012-10060
📋 TL;DR
CVE-2012-10060 is a critical stack-based buffer overflow vulnerability in Sysax Multi Server's SSH service. Attackers can exploit this by sending an overly long username during authentication, potentially leading to remote code execution. Organizations running Sysax Multi Server versions before 5.55 are affected.
💻 Affected Systems
- Sysax Multi Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with remote code execution as the service account, potentially leading to full domain takeover, data exfiltration, or ransomware deployment.
Likely Case
Remote code execution leading to backdoor installation, credential theft, and lateral movement within the network.
If Mitigated
Attack blocked at network perimeter or detected before exploitation; no impact if proper patching and segmentation are in place.
🎯 Exploit Status
Multiple public exploits exist including Metasploit modules; exploitation requires no authentication and is straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.55 and later
Vendor Advisory: https://web.archive.org/web/20120302203344/http://www.pwnag3.com/2012/02/sysax-multi-server-ssh-username-exploit.html
Restart Required: Yes
Instructions:
1. Download Sysax Multi Server version 5.55 or later from vendor. 2. Install the update following vendor instructions. 3. Restart the Sysax Multi Server service.
🔧 Temporary Workarounds
Disable SSH Service
windowsTemporarily disable the SSH service if not required for operations.
sc stop "SysaxSSHServer"
sc config "SysaxSSHServer" start= disabled
Network Segmentation
windowsRestrict SSH access to trusted IP addresses only using firewall rules.
netsh advfirewall firewall add rule name="Restrict Sysax SSH" dir=in action=allow protocol=TCP localport=22 remoteip=192.168.1.0/24,10.0.0.0/8
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Sysax servers from critical assets
- Deploy intrusion prevention systems (IPS) with signatures for this specific exploit
🔍 How to Verify
Check if Vulnerable:
Check Sysax Multi Server version in application interface or registry: HKEY_LOCAL_MACHINE\SOFTWARE\Sysax\Multi Server\VersionCheck Version:
reg query "HKLM\SOFTWARE\Sysax\Multi Server" /v VersionVerify Fix Applied:
Verify version is 5.55 or higher and test with known exploit payloads in a controlled environment.📡 Detection & Monitoring
Log Indicators:
- Unusually long usernames in SSH authentication logs
- Multiple failed SSH connections with varying long usernames
Network Indicators:
- SSH connections with payloads exceeding normal username length
- Traffic patterns matching known exploit signatures
SIEM Query:
source="sysax.log" AND "ssh" AND username.length > 100🔗 References
- https://advisories.checkpoint.com/defense/advisories/public/2012/cpai-23-sepc.html
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ssh/sysax_ssh_username.rb
- https://web.archive.org/web/20120302203344/http://www.pwnag3.com/2012/02/sysax-multi-server-ssh-username-exploit.html
- https://www.exploit-db.com/exploits/18535
- https://www.exploit-db.com/exploits/18557
- https://www.sysax.com/
- https://www.vulncheck.com/advisories/sysax-multi-server-ssh-username-buffer-overflow
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ssh/sysax_ssh_username.rb
