Description
ZEN Load Balancer versions 2.0 and 3.0-rc1 contain a command injection vulnerability in content2-2.cgi. The filelog parameter is passed directly into a backtick-delimited exec() call without sanitation. An authenticated attacker can inject arbitrary shell commands, resulting in remote code execution as the root user. ZEN Load Balancer is the predecessor of ZEVENET and SKUDONET. The affected versions (2.0 and 3.0-rc1) are no longer supported. SKUDONET CE is the current community-maintained successor.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ZEN Load Balancer | ZEN Load Balancer | 2.0, 3.0-rc1 | — |
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.
Metasploit 1 module
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ZEN Load Balancer Filelog Command Execution
exploit/linux/http/zen_load_balancer_exec
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- https://web.archive.org/web/20221203195056/https://itsecuritysolutions.org/2012-09-21-ZEN-Load-Balancer-v2.0-and-v3.0-rc1-multiple-vulnerabilities/ technical-description exploit
- https://web.archive.org/web/20111015031540/http://www.zenloadbalancer.com/ product
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/linux/http/zen_load_balancer_exec.rb exploit
- https://www.exploit-db.com/exploits/21849 exploit
- https://www.fortiguard.com/encyclopedia/ips/33335/zen-load-balancer-filelog-command-execution third-party-advisory