Description
Amlib’s NetOpacs webquery.dll contains a stack-based buffer overflow vulnerability triggered by improper handling of HTTP GET parameters. Specifically, the application fails to enforce bounds on input supplied to the app parameter, allowing excessive data to overwrite memory structures including the Structured Exception Handler (SEH). Additionally, malformed parameter names followed by an equals sign may result in unintended control flow behavior. This vulnerability is exposed through IIS and affects legacy Windows deployments
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Amlib | Amlibweb Library Management System | — | — |
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
-
Amlibweb NetOpacs webquery.dll Stack Buffer Overflow
exploit/windows/http/amlibweb_webquerydll_app
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/http/amlibweb_webquerydll_app.rb exploit
- https://www.exploit-db.com/exploits/16793 exploit
- https://www.fortiguard.com/encyclopedia/ips/24002 third-party-advisory
- https://advisories.checkpoint.com/defense/advisories/public/2013/cpai-2013-1344.html third-party-advisory
- https://www.amlib.co.uk/product/product.aspx?menuId=top_products product
- https://www.vulncheck.com/advisories/amlibweb-netopacs-stack-buffer-overflow third-party-advisory