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omoc writes:

A very recent firmware analysis (PDF) from the reverse engineer Eloi Vanderbeken shows that NETGEAR didn't fix the backdoor on port 32764 but instead implemented a knocking feature that is now required to unlock the service.

Summary from the slides: The knocking feature is initiated when a "packet type == 0x201" arrived at "ft_tool" that listens to the Ethernet packets. It only works with EtherType 0x8888 and the payload has to be "45d1bb339b07a6618b2114dbc0d7783e" which is the MD5-hash of the model number DGN1000. If such a packet arrives, the backdoor service /usr/bin/scfgmgr f- is launched.

Ars Technica reports:

The nature of the change, which leverages the same code as was used in the old firmware to provide administrative access over the concealed port, suggests that the backdoor is an intentional feature of the firmware and not just a mistake made in coding. "It's DELIBERATE," Vanderbecken asserted in his presentation.

1. "omoc" - http://soylentnews.org/~omoc/
2. "firmware analysis" - http://www.synacktiv.com/ressources/TCP32764_backdoor_again.pdf
3. "Ars Technica reports" - http://arstechnica.com/security/2014/04/easter-egg-dsl-router-patch-merely-hides-backdoor-instead-of-closing-it/

printed from SoylentNews, Netgear Hides Router Backdoor Instead of Fixing It on 2024-04-20 00:24:51