Vulnerable products : Linksys EA2700, EA3500, E4200, EA4500 using lighttpd 1.4.28 and Utopia on Linux 2.6.22
Firmware Version: 1.0.14 EA2700 Firmware Version: 1.0.30 EA3500 Firmware Version: 2.0.36 E4200 Firmware Version: 2.0.36 EA4500
Impact: - Major
Timeline: - Still awaiting word back from Linksys support. Partial disclosure at the present due to the impact; Full disclosure in near future if warranted.
Vulnerabilities: - Unauthenticated remote access to all pages of the router administration GUI, bypassing any credential prompts under certain common configurations (see below) - Direct access to several other critical files, unauthenticated as well
Vulnerability Conditions seen in all variations:
Although not the same symptoms as the bug that plagues most ASUS routers that are AiCloud enabled with WebDav, the utilization of both UPnP and SSL on lighttpd v 1.4.28 appears to be an extremely problematic combination, exposing certain vulnerabilities to the WAN side of the router.
Testing additional firmware is ongoing.