Zero-day Vulnerability Database

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Zero-day vulnerabilities discovered: 1

Backdoor in D-Link routers
CVE-2013-6026

Security bypass

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to an error in the alpha_auth_check() function. By setting the user agent string to xmlset_roodkcableoj28840ybtide, an attacker can send an HTTP request to bypass authentication and obtain administrative access to the device.

Successful exploitation of the vulnerability results in full access to the vulnerable system.

Note: the vulnerability was being actively exploited.

Software: Dir-100

Links:

http://www.devttys0.com/2013/10/reverse-engineering-a-d-link-backdoor/
https://packetstormsecurity.com/files/123848/D-Link-Backdoor-Czechr.html
http://www.securityspace.com/smysecure/catid.html?id=1.3.6.1.4.1.25623.1.0.103810
https://www.symantec.com/security_response/attacksignatures/detail.jsp?asid=27130
https://krebsonsecurity.com/2013/12/important-security-update-for-d-link-routers/

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About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.