Finding DrayTek Vigor routers
The Trellix Threat Labs Vulnerability Research team recently published vulnerability details affecting almost 30 models of DrayTek Vigor routers. This vulnerability resides in the management interface login page and is trivial to exploit via buffer overflow. An unauthenticated attacker can easily gain control over vulnerable Vigor devices, doing so remotely if the management interface is exposed to the Internet.
Tracked as CVE-2022-32548 with a CVSS “critical” maximum score of 10, successful attackers can potentially leverage device control to execute code, establish a foothold on the network for further exploration, exfiltrate sensitive data, add the device to a botnet, and more. Trellix researchers found over 200k vulnerable Vigor devices with management interfaces exposed to the Internet, putting them at risk of remote exploitation. Even with external access to the management interface disabled, vulnerable devices are still susceptible to exploitation via the local network.
DrayTek has provided patched firmware for affected Vigor devices. Admins should ensure that affected models are updated to the latest firmware version. The Trellix research team also provided additional mitigation recommendations, including disabling public-facing access to the management interface (see Recommendations).
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