Zero-day vulnerability in Dir-100

Security bypass

Vulnerability details

Advisory: SB2013101201 - Backdoor in D-Link routers

Vulnerable component: Dir-100

CVE-ID: CVE-2013-6026

CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

CWE-ID: CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting')


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.