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Research > Zero-Day Tracker > 20131012

Multiple Routers (D-Link/Planex) Coded Backdoor

Date Disclosed:
10/12/2013

Date Patched:
11/6/2013

Vendor:
D-Link, Planex

Affected Software:
See D-Link Advisory for more details.

D-Link:
DIR-100
DIR-120
DI-624S
DI-524UP
DI-604S
DI-604UP
DI-604+
TM-G5240

Planex:
BRL-04R
BRL-04UR
BRL-04CW

Description:
Multiple routers from D-Link and Planex share firmware code, which contains a backdoor that has been hardcoded into the firmware. The firmware contains an authentication routine that is bypassed when a user-agent, "xmlset_roodkcableoj28840ybtide", makes a request. This allows an attacker to manipulate the router at will, if they change their user-agent to "xmlset_roodkcableoj28840ybtide". Additionally, this backdoor makes a stack-based overflow available to a remote attacker, which may allow an attacker to arbitrarily execute code on the router.

Severity:
High

Code Execution:
Yes.

Impact:
Authentication Bypass/Remote Code Execution
Remote attackers may be able to modify settings on vulnerable routers by changing their user-agents to "xmlset_roodkcableoj28840ybtide", which bypasses authentication. Additionally, a proof of concept has been released that demonstrates the availability of a vulnerability exposed by the authentication bypass, that allows for remote code execution within an affected router. This may allow a remote attacker to re-write the firmware of a vulnerable router, allowing an attacker to re-route traffic or perform other malicious actions on a vulnerable device. 

Mitigation:
See D-Link Advisory for more details regarding patched D-Link firmwares.

Protection:
BeyondTrust's Retina® Network Security Scanner scans devices to detect for this vulnerability.

  • 31467 - Multiple Routers Hardcoded Backdoor (20131012) - Remote

Links:

Status:
2013-10-12 - Original research/advisory released.

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