D-Link DIR-645 Authentication Bypass

Type packetstorm
Reporter Roberto Paleari
Modified 2013-02-28T00:00:00


                                            `Unauthenticated remote access to D-Link DIR-645 devices  
Title: Unauthenticated remote access to D-Link DIR-645 devices  
Discovery date: 20/02/2013  
Release date: 27/02/2013  
Credits: Roberto Paleari (roberto@greyhats.it, twitter: @rpaleari)  
Class: Authentication bypass  
This security vulnerability affects the following products and firmware  
* D-Link DIR-645, firmware version < 1.03  
Other products and firmware versions could also be vulnerable, but they were  
not checked.  
The web interface of D-Link DIR-645 routers expose several pages accessible  
with no authentication. These pages can be abused to access sensitive  
information concerning the device configuration, including the clear-text  
password for the administrative user. In other words, by exploiting this  
vulnerability unauthenticated remote attackers can retrieve the administrator  
password and then access the device with full privileges.  
More in detail, the following HTTP request fetches the administrator password:  
curl -d SERVICES=DEVICE.ACCOUNT http://<device ip>/getcfg.php  
For those that are not familiar with "curl" syntax, the above command-line  
requests the "getcfg.php" page, supplying the HTTP POST data  
The lack of proper authentication checks is not limited to the "getcfg.php" web  
page. As an example, the following requests can also be performed with no  
1. Read system log  
curl http://<device ip>/log_get.php  
2. Get DDNS statistics  
curl -d act=getreport http://<device ip>/ddns_act.php  
3. Dump device details  
curl http://<device ip>/DevInfo.php  
D-Link has released an updated firmware version (1.03) that addresses this  
issue. The firmware is already available on D-Link web site, and introduces  
additional restrictions to forbid unauthenticated access to page "getcfg.php".  
The author is not responsible for the misuse of the information provided in  
this security advisory. The advisory is a service to the professional security  
community. There are NO WARRANTIES with regard to this information. Any  
application or distribution of this information constitutes acceptance AS IS,  
at the user's own risk. This information is subject to change without notice.