Executive Summary

This Alert is flagged as TOP 25 Common Weakness Enumeration from CWE/SANS. For more information, you can read this.
Title DrayTek Vigor 2700 ADSL router contains a command injection vulnerability
Name VU#101462 First vendor Publication 2013-10-22
Vendor VU-CERT Last vendor Modification 2013-10-22
Severity (Vendor) N/A Revision M

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:P/I:P/A:P)
Cvss Base Score 6.8 Attack Range Network
Cvss Impact Score 6.4 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


Vulnerability Note VU#101462

DrayTek Vigor 2700 ADSL router contains a command injection vulnerability

Original Release date: 22 Oct 2013 | Last revised: 22 Oct 2013


DrayTek Vigor 2700 ADSL router version 2.8.3 and possibly earlier versions contain a command injection vulnerability via malicious SSID (CWE-77).


CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')

DrayTek Vigor 2700 ADSL router version 2.8.3 contains a command injection vulnerability. The Vigor router stores discovered SSIDs of surrounding access points into the sWlessSurvey variable inside variables.js, which is a list of multiple variables used by the web administration console. An attacker can utilize JavaScript code in the SSID value of a malicious nearby access point which will cause the DrayTek router to execute the command when it adds the SSID into the variables.js list.


An attacker within range of the DrayTek Vigor ADSL router can edit the SSID on their malicious access point to corrupt the variables.js file. This may cause the DrayTek router to call external scripts or make unauthorized changes to the settings, which may include poisoning the DNS cache.

The attacker may continue changing the SSID value of their rogue access point, causing JavaScript alert messages to be sent to the web console, thus preventing administration to the DrayTek router.

This attack requires the victim to manually scan for SSID values from the web administration page. Conversely, the device will automatically scan for any SSIDs in range when it is first powered on.


We are currently unaware of a practical solution to this problem.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate Updated
DrayTek CorporationAffected06 Sep 201310 Oct 2013
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)



  • http://cwe.mitre.org/data/definitions/77.html
  • http://www.draytek.com/index.php?option=com_k2&view=item&layout=item&id=2553&Itemid=452&lang=en


Thanks to Juraj Kosik for reporting this vulnerability.

This document was written by Adam Rauf.

Other Information

  • CVE IDs:CVE-2013-5703
  • Date Public:22 Oct 2013
  • Date First Published:22 Oct 2013
  • Date Last Updated:22 Oct 2013
  • Document Revision:25


If you have feedback, comments, or additional information about this vulnerability, please send us email.

Original Source

Url : http://www.kb.cert.org/vuls/id/101462

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-78 Improper Sanitization of Special Elements used in an OS Command ('OS Command Injection') (CWE/SANS Top 25)

CPE : Common Platform Enumeration

Hardware 1
Os 1

Alert History

If you want to see full details history, please login or register.
Date Informations
2013-11-11 13:36:15
  • Multiple Updates
2013-10-23 13:23:56
  • Multiple Updates
2013-10-22 17:19:28
  • First insertion