I WILL NOT MANUALLY UPDATE THIS REPOSITORY ANYMORE
If you want to add a router in the list, please make a pull-request, also remember to USE THE POC and paste the result in your pull-request. Telnet clients and other solutions may not be relevant (some false negative / positive reported).
Some random code/data about the backdoor I found in my Linksys WAG200G (TCP/32764).
The backdoor may be present in other hardware, I'll update this readme accordingly. :)
Possible fix :
- if it's listening on the internet: add a firewall rule in the web UI (@domainzero)
- it also seems to work on the LAN side. (issue 35)
- but apparently, not for every body (issue 57) so use the PoC again after adding the rule to make sure the firewall does its job.
- install an open source firmware (for example OpenWRT or Tomato) this is NOT magical, OpenWAG200 is vuln: http://sourceforge.net/projects/openwag200/files/OpenWAG200/1.4/
- kill the backdoor after each reboot (issue 61 & TCP-32764-First-Aid)
- use this alternative firmware: amod (thank you pidocchio and nremond)
- redirect the port traffic in your router firewall to a local unused IP and done ([@osisecurite])
Probable source of the backdoor:
- SerComm https://news.ycombinator.com/item?id=6998258 (nice finding :) )
- Confirmed by a header (socket_header.h) in cisco gpl sources (thank you Andreas Fett!)
Backdoor LISTENING ON THE INTERNET confirmed in :
- Linksys WAG120N (@p_w999)
- Netgear DG834B V5.01.14 (@domainzero)
- Netgear DGN2000 1.1.1, 1.1.11.0, 1.3.10.0, 1.3.11.0, 1.3.12.0 (issue 44)
- Netgear WPNT834 (issue 79)
- OpenWAG200 maybe a little bit TOO open ;) (issue 49)
Backdoor confirmed in:
- Cisco RVS4000 fwv 2.0.3.2 & 1.3.0.5 (issue 57)
- Cisco WAP4410N (issue 11)
- Cisco WRVS4400N
- Cisco WRVS4400N (issue 36)
- Diamond DSL642WLG / SerComm IP806Gx v2 TI (https://news.ycombinator.com/item?id=6998682)
- LevelOne WBR3460B (http://www.securityfocus.com/archive/101/507219/30/0/threaded)
- Linksys RVS4000 Firmware V1.3.3.5 (issue 55)
- Linksys WAG120N (issue 58)
- Linksys WAG160n v1 and v2 (@xxchinasaurxx @saltspork)
- Linksys WAG200G
- Linksys WAG320N (http://zaufanatrzeciastrona.pl/post/smieszna-tylna-furtka-w-ruterach-linksysa-i-prawdopodobnie-netgeara/)
- Linksys WAG54G2 (@_xistence)
- Linksys WAG54GS (@henkka7)
- Linksys WRT350N v2 fw 2.00.19 (issue 39)
- Linksys WRT300N fw 2.00.17 (issue 34)
- Netgear DG834[∅, GB, N, PN, GT] version < 5 (issue 19 & issue 25 & issue 62 & jd & Burn2 Dev)
- Netgear DGN1000 (don't know if there is a difference with the others N150 ones... issue 27)
- Netgear DGN1000[B] N150 (issue 3)
- Netgear DGN2000B (issue 26)
- Netgear DGN3500 (issue 13)
- Netgear DGND3300 (issue 56)
- Netgear DGND3300Bv2 fwv 2.1.00.53_1.00.53GR (issue 59)
- Netgear DM111Pv2 (@eguaj)
- Netgear JNR3210 (issue 37)
Backdoor may be present in:
- all SerComm manufactured devices (https://news.ycombinator.com/item?id=6998258)
- Linksys WAG160N (http://zaufanatrzeciastrona.pl/post/smieszna-tylna-furtka-w-ruterach-linksysa-i-prawdopodobnie-netgeara/)
- Netgear DG934 probability: probability: 99.99% (http://codeinsecurity.wordpress.com/category/reverse-engineering/)
- Netgear WG602, WGR614 (v3 doesn't work, maybe others...) (http://zaufanatrzeciastrona.pl/post/smieszna-tylna-furtka-w-ruterach-linksysa-i-prawdopodobnie-netgeara/)
Backdoor is not working in:
- Belkin F5D7230-4 6000 (SerComm manufactured product) (issue 51)
- Belkin F9K1002 v3 (SerComm manufactured product)
- Cisco E2000 fwv 1.0.02 (issue 17)
- Cisco Linksys E4200 V1 fwv 1.0.05 (issue 18)
- Cisco Linksys X2000 (issue 40)
- Cisco EPC3925
- Cisco RV082 v03 fw4.2.2.08 (issue 94)
- Linksys E2500 (@Antoniojojojo)
- Linksys E3000 fwv 1.0.04 (issue 16)
- Linksys E3200 Firmware Version: 1.0.04 (Build 1)
- Linksys E4200 Firmware Version: 2.0.26 (issue 53)
- Linksys RV082 v02 fw2.0.2.01-tm (issue 94)
- Linksys WAG354G V.2 EU (issue 69)
- Linksys WRT100 fwv 1.0.00 (Issue 71)
- Linksys WRT110 fwv 1.0.07 (issue 70)
- Linksys WRT120N fwv 1.0.07 (@viniciuskmax)
- Linksys WRT160Nv2 (issue 43)
- Linksys WRT160Nv3
- Linksys WRT320N (issue 31)
- Linksys WRT54GL(v1.1) Firmware v4.30.16
- Linksys WRT54GS v1.52.8 build 001 (thanks Helmut Tessarek)
- Linksys WRT600N running 1.01.36 build 3 (@shanetheclassic & issue 46)
- Linksys WRT610N V1 fwv 1.00.03 B15 (issue 60)
- Netgear CG3100 (issue 6)
- Netgear CG3700EMR as provided by ComHem Sweden (issue 20)
- Netgear DG834G v5 (manufactured by Foxconn as opposed to the previous versions, nice finding anthologist issue 28)
- Netgear DGN2200Bv3 (V1.1.00.23_1.00.23) (issue 41)
- Netgear DGN3500 (amod 9.3.1 based on official 1.1.00.34 - http://alfie.altervista.org/amod)
- Netgear DGND3700 (issue 33)
- Netgear DGND4000 (V1.1.00.14_1.00.14) (issue 67)
- Netgear ProSafe FVS318G fwv 3.1.1-14 (thank you Jason Leake :) )
- Netgear R4500 firmware V1.0.0.4_1.0.3 (issue 64)
- Netgear R6300 (issue 15)
- Netgear R7000 (@LRFLEW)
- Netgear RP614v[4,2] V1.0.8_02.02 (issue 22 & issue 24)
- Netgear VMDG480 (aka. VirginMedia SuperHub) swv 2.38.01 (issue 16)
- Netgear VMDG485 (aka. VirginMedia SuperHub 2) swv1.01.26 (issue 16)
- Netgear WGR614v3 (issue 8)
- Netgear WGR614v7 (thanks "Martin from germany" [your e-mail doesn't work])
- Netgear WGR614v9 (issue 7)
- Netgear WN2500RP (issue 15)
- Netgear WNDR3700 (@juliengrenier)
- Netgear WNDR4000 (issue 10)
- Netgear WNDR4500 (@TechnicalRah)
- Netgear WNR2000v3 (issue 43)
- Netgear WNR3500L firmware V1.2.2.30_34.0.37 (issue 65)
- Netgear WNR3500Lv2
- Sercomm AD81ABA
Some clarifications: I didn't want to waste my time in writing a full report, it's a very simple backdoor that really doesn't deserve more than some crappy slides. Moreover, my English is quite bad.
I had a lot of fun in writing / drawing the slides, all the necessary information is in them. If people don't understand them or find them "too full of meme" then - well - it's too bad for them. :)