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Who: Belkin International, Inc. http://www.belkin.com
What: Belkin BullDog Plus UPS Management Software v4.0.2 Build 1219
UPS-Service.exe v184.108.40.206 dated 12/19/2006
How: The UPS management software contains a built-in web server which allows for remote management of the UPS. The management interface is protected by a username and password. Authentication is performed via Basic authentication.
There is a small stack-based overflow in the base64 decoding routine which handled the Basic authentication data.
Caveats: The web server is not enabled by default.
Exploit: The size of the buffer is too small for shellcode, however, this can be stored in the GET request, which sits at esp+0x58.
Fix: I was unable to locate any security contact information for this vendor, so I attempted to contact their support department, which turned out to be waste of time.
Workaround: As previously stated, the web server is not enabled by default. If you do need to use it, use a firewall or OS port filtering capabilities to restrict access.
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