Computer Repair Service

An exploit has been found in the NetUSB module on many home routers. Most manufacturers have released a firmware update to fix the issue. However NetGear has stated that there is no fix for many of there router. NetUSB suffers from a remotely exploitable kernel stack buffer overflow. Because of insufficient input validation, an overly long computer name can be used to overflow the “computer name” kernel stack buffer. This results in memory corruption which can be turned into arbitrary remote code execution.

The attacker would have to have access to your local network to effect this exploit. If your router is one of the effected and you provide public Wifi service you should upgrade your firmware if a update is available or replace your router.

The vulnerability has been verified to exist in most recent firmware versions of the following devives:

TP-Link TL-WDR4300 V1
TP-Link WR1043ND v2
NETGEAR WNDR4500

Furthermore we’ve identified NetUSB in the most recent firmware version of the
following products (list is not necessarily complete!):

D-Link DIR-615 C
NETGEAR AC1450
NETGEAR CENTRIA (WNDR4700/4720)
NETGEAR D6100
NETGEAR D6200
NETGEAR D6300
NETGEAR D6400
NETGEAR DC112A
NETGEAR DC112A (Zain)
NETGEAR DGND4000
NETGEAR EX6200
NETGEAR EX7000
NETGEAR JNR3000
NETGEAR JNR3210
NETGEAR JR6150
NETGEAR LG6100D
NETGEAR PR2000
NETGEAR R6050
NETGEAR R6100
NETGEAR R6200
NETGEAR R6200v2
NETGEAR R6220
NETGEAR R6250
NETGEAR R6300v1
NETGEAR R6300v2
NETGEAR R6700
NETGEAR R7000
NETGEAR R7500
NETGEAR R7900
NETGEAR R8000
NETGEAR WN3500RP
NETGEAR WNDR3700v5
NETGEAR WNDR4300
NETGEAR WNDR4300v2
NETGEAR WNDR4500
NETGEAR WNDR4500v2
NETGEAR WNDR4500v3
NETGEAR XAU2511
NETGEAR XAUB2511
TP-LINK Archer C2 V1.0 (Fix planned before 2015/05/22)
TP-LINK Archer C20 V1.0 (Not affected)
TP-LINK Archer C20i V1.0 (Fix planned before 2015/05/25)
TP-LINK Archer C5 V1.2 (Fix planned before 2015/05/22)
TP-LINK Archer C5 V2.0 (Fix planned before 2015/05/30)
TP-LINK Archer C7 V1.0 (Fix planned before 2015/05/30)
TP-LINK Archer C7 V2.0 (Fix already released)
TP-LINK Archer C8 V1.0 (Fix planned before 2015/05/30)
TP-LINK Archer C9 V1.0 (Fix planned before 2015/05/22)
TP-LINK Archer D2 V1.0 (Fix planned before 2015/05/22)
TP-LINK Archer D5 V1.0 (Fix planned before 2015/05/25)
TP-LINK Archer D7 V1.0 (Fix planned before 2015/05/25)
TP-LINK Archer D7B V1.0 (Fix planned before 2015/05/31)
TP-LINK Archer D9 V1.0 (Fix planned before 2015/05/25)
TP-LINK Archer VR200v V1.0 (Fix already released)
TP-LINK TD-VG3511 V1.0 (End-Of-Life)
TP-LINK TD-VG3631 V1.0 (Fix planned before 2015/05/30)
TP-LINK TD-VG3631 V1.0 (Fix planned before 2015/05/31)
TP-LINK TD-W1042ND V1.0 (End-Of-Life)
TP-LINK TD-W1043ND V1.0 (End-Of-Life)
TP-LINK TD-W8968 V1.0 (Fix planned before 2015/05/30)
TP-LINK TD-W8968 V2.0 (Fix planned before 2015/05/30)
TP-LINK TD-W8968 V3.0 (Fix planned before 2015/05/25)
TP-LINK TD-W8970 V1.0 (Fix planned before 2015/05/30)
TP-LINK TD-W8970 V3.0 (Fix already released)
TP-LINK TD-W8970B V1.0 (Fix planned before 2015/05/30)
TP-LINK TD-W8980 V3.0 (Fix planned before 2015/05/25)
TP-LINK TD-W8980B V1.0 (Fix planned before 2015/05/30)
TP-LINK TD-W9980 V1.0 (Fix already released)
TP-LINK TD-W9980B V1.0 (Fix planned before 2015/05/30)
TP-LINK TD-WDR4900 V1.0 (End-Of-Life)
TP-LINK TL-WR1043ND V2.0 (Fix planned before 2015/05/30)
TP-LINK TL-WR1043ND V3.0 (Fix planned before 2015/05/30)
TP-LINK TL-WR1045ND V2.0 (Fix planned before 2015/05/30)
TP-LINK TL-WR3500 V1.0 (Fix planned before 2015/05/22)
TP-LINK TL-WR3600 V1.0 (Fix planned before 2015/05/22)
TP-LINK TL-WR4300 V1.0 (Fix planned before 2015/05/22)
TP-LINK TL-WR842ND V2.0 (Fix planned before 2015/05/30)
TP-LINK TL-WR842ND V1.0 (End-Of-Life)
TP-LINK TX-VG1530(GPON) V1.0 (Fix planned before 2015/05/31)
Trendnet TE100-MFP1 (v1.0R)
Trendnet TEW-632BRP (A1.0R)
Trendnet TEW-632BRP (A1.1R/A1.2R)
Trendnet TEW-632BRP (A1.1R/A1.2R/A1.3R)
Trendnet TEW-634GRU (v1.0R)
Trendnet TEW-652BRP (V1.0R)
Trendnet TEW-673GRU (v1.0R)
Trendnet TEW-811DRU (v1.0R)
Trendnet TEW-812DRU (v1.0R)
Trendnet TEW-812DRU (v2.xR)
Trendnet TEW-813DRU (v1.0R)
Trendnet TEW-818DRU (v1.0R)
Trendnet TEW-823DRU (v1.0R)
Trendnet TEW-MFP1 (v1.0R)
Zyxel NBG-419N v2
Zyxel NBG4615 v2
Zyxel NBG5615
Zyxel NBG5715

Based on information embedded in KCodes drivers we believe the following vendors are affected:
Allnet
Ambir Technology
AMIT
Asante
Atlantis
Corega
Digitus
D-Link
EDIMAX
Encore Electronics
Engenius
Etop
Hardlink
Hawking
IOGEAR
LevelOne
Longshine
NETGEAR
PCI
PROLiNK
Sitecom
Taifa
TP-LINK
TRENDnet
Western Digital
ZyXEL

Workaround:
———–
Sometimes NetUSB can be disabled via the web interface, but at least on NETGEAR devices this does not mitigate the vulnerability. NETGEAR told us, that there is no workaround available, the TCP port can’t be firewalled nor is there a way to disable the service on their devices.

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