Friday, January 11, 2013

DefenseCode Security Advisory (UPCOMING): Cisco Linksys Remote Preauth 0day Root Exploit

Story behind the vulnerability...

Months ago, we've contacted Cisco about a remote preauth (root access) vulnerability
in default installation of their Linksys routers that we've discovered. We gave them
detailed vulnerability description along with the PoC exploit for the vulnerability.

They said that this vulnerability was already fixed in latest firmware release...
Well, not this particular vulnerability, since the latest official Linksys firmware -
4.30.14, and all previous versions are still vulnerable.

Exploit shown in this video has been tested on Cisco Linksys WRT54GL, but other 
Linksys versions/models are probably also affected.
Cisco Linksys is a very popular router with more than 70,000,000 routers sold.
That's why we think that this vulnerability deserves attention.

According to our vulnerability disclosure policy, the vulnerability details will be
disclosed in following 2 weeks on , BugTraq and
Full Disclosure.
Due to the severity of this vulnerability, once again we would like to urge Cisco
to fix this vulnerability.

The vulnerability is demonstrated in the following video:

Kind Regards,


  1. Thanks for doing this valuable research. I hope you will also think of the free software community and help them too by verifying if these issues are applicable to other firmware such as OpenWRT, DD-WRT and Tomato when you fully disclose.

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