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Multiple Vulnerabilities in D-Link Routers Allows Hackers Gain Complete Control & Extract Sensitive Data

Set of 4 Vulnerabilities are discovered in D-Link DIR-620 firmware that allows an attacker to exploit with the hardcoded default credentials to gain high privileged access to the firmware.

D-Link routers are one of the biggest ISPs in Russia based on the Router login string contains hardcoded credentials with the name of the ISP.

The Vulnerabilities allow attack could gain the privileged access to the firmware that leads to extract the sensitive data such as Plain text Passwords.

It also affected the web interface that allows an attacker to run arbitrary commands in the router’s operating system and arbitrary JavaScript code in the user environment.

These vulnerabilities initially identified in firmware version 1.0.37 and the few vulnerabilities affected other versions( 1.3.1, 1.3.3, 1.4.0, 2.0.22) of the firmware.

D-Link Routers Vulnerabilities
There are 4 critical vulnerabilities are reporting and all the vulnerabilities contain the high severity rate that causes very serious damages.
  1. Reflected cross-site scripting (CVE-2018-6212)
  2. Default credentials for web dashboard (CVE-2018-6213)
  3. OS command injection  (CVE-2018-6211)
  4. Default credentials for Telnet (CVE-2018-6210)

Cross-site scripting(XSS)
Researchers discovered reflected cross-site scripting(XSS) vulnerability in one the D-link router field due to poor user data validation and incorrect processing of the XMLHttpRequest object.

This vulnerability was discovered in v.1.3.3 and other versions.
Default credentials for web Dashboard
D-Link contains default credentials for web dashboard which cannot be changed by administrators which leads to attacker gain the sensitive data from Vulnerable routers.

According to Kaspersky Researcher, I extracted strings from the web server binary (httpd), and my attention was immediately drawn to the “anonymous” string. I looked at the function where this string was being used.

OS Command Injection
An OS Command injection vulnerability discovered in D – v.1.0.3  that leads to processing incorrectly user’s input data.
Default Credentials for Telnet
This critical vulnerability allows an attacker to extract Telnet credentials. In this case, the attacker also gain the admin level access by using the default credentials.
Mitigation :
  • Restrict any access to the web dashboard using a whitelist of trusted IPs
  • Restrict any access to Telnet
  • Regularly change your router admin username and password
via gbhackers
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