Path traversal in TP-LINK WR740 and possibly others

Path traversal in TP-LINK WR740 and possibly others

Posted on Jun 18 2012   |  Plain text version

Summary

TP-Link WR740 routers are vulnerable to a path traversal vulnerability on the web administration interface. Unauthenticated users are able to read any file from the device.

Description

Models: WR740N, WR740ND and possibly others.
Update: People have been reporting on forums that models WR743ND,WR842ND,WA-901ND,WR941N,WR941ND,WR1043ND,WR2543ND,MR3220,MR3020,WR841N are also based on the same HTTP daemon but we haven't been able to test it ourselves.
Firmware: 3.12.11 Build 111130 Rel.55312n and possibly others
Date: 26/05/2012
Severity: High
Impact: Disclosure of configuration and password files.
Attack vector: Remote. No auth required.
Solution: N/A

The router TP-Link WR740ND/WR740N has a HTTP server running on port 80 handling the web management interface.

There exists a path traversal vulnerability in the URI "/help" that allows attackers to read any file including configurations.

It is possible to read other configuration files if the services have been configured previously. (No-IP, DyDNS, Samba, NFS)

POC

After further research we discovered that the URL was posted before on some russian forum, but not mentioned as a vulnerability and specifying another model.

Paulino Calderón
calderon()websec.mx


Latest Blog Entries

Panoptic
An overview of Panoptic, an open source penetration testing tool that automates the process of search and retrieval of common log and config files through LFI vulnerabilities.

Special discount code for "Nmap 6: Network Exploration and Security Auditing Cookbook"
PacktPub created a special discount code for our friends from HackerHalted

Mac2WepKey HHG5xx for iPhone
The famous app to obtain the default WiFi passwords for Huawei routers is now available for the iPhone iOS 5.

Latest News

Oct 01, 2013
Websec at DerbyCon 2013
A summary of Websec's participation at DerbyCon 2013 in Louisville, Kentucky.

Sep 16, 2013
Websec's participation at Black Hat, CSI and XCon
Websec is grateful to have been able to participate in the month of August at great conferences such as Black Hat, CSI and XCon.