Vulnerability identifier: #VU6514

Vulnerability risk: Low

CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-6549

CWE-ID: CWE-592

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
RT-AC53
Hardware solutions / Routers for home users
RT-N600
Hardware solutions / Routers for home users
RT-N300
Hardware solutions / Routers for home users
RT-N66W
Hardware solutions / Routers for home users
RT-N66U
Hardware solutions / Routers for home users
RT-N66R
Hardware solutions / Routers for home users
RT-N56U
Hardware solutions / Routers for home users
RT-N16
Hardware solutions / Routers for home users
RT-N12E
Hardware solutions / Routers for home users
RT-N12+
Hardware solutions / Routers for home users
RT-N12
Hardware solutions / Routers for home users
RT-N11P
Hardware solutions / Routers for home users
RT-AC5300
Hardware solutions / Routers for home users
RT-AC3200
Hardware solutions / Routers for home users
RT-AC3100
Hardware solutions / Routers for home users
RT-AC1750
Hardware solutions / Routers for home users
RT-AC1200
Hardware solutions / Routers for home users
RT-AC88U
Hardware solutions / Routers for home users
RT-AC87U
Hardware solutions / Routers for home users
RT-AC87R
Hardware solutions / Routers for home users
RT-AC68R
Hardware solutions / Routers for home users
RT-AC68P
Hardware solutions / Routers for home users
RT-AC68W
Hardware solutions / Routers for home users
RT-AC66W
Hardware solutions / Routers for home users
RT-AC68UF
Hardware solutions / Routers for home users
RT-AC68U
Hardware solutions / Routers for home users
RT-AC66U
Hardware solutions / Routers for home users
RT-AC56U
Hardware solutions / Routers for home users
RT-AC56S
Hardware solutions / Routers for home users
RT-AC56R
Hardware solutions / Routers for home users
RT-AC55U
Hardware solutions / Routers for home users
RT-AC52U B1
Hardware solutions / Routers for home users
RT-AC51U
Hardware solutions / Routers for home users

Vendor: Asus

Description
The vulnerability allows a remote unauthenticated user to hijack any active admin session.

The weakness exists due to improper input validation. A remote attacker can send cgi_logout and asusrouter-Windows-IFTTT-1.0 in certain HTTP headers and gain the session cookies to hijack the valid user's session.

Successful exploitation of the vulnerability leads to session steal.

Mitigation
Install update from vendor's website.

Vulnerable software versions

RT-AC53: 3.0.0.4.380.6038

RT-N600: All versions

RT-N300: All versions

RT-N66W: All versions

RT-N66U: B1

RT-N66R: All versions

RT-N56U: All versions

RT-N16: All versions

RT-N12E: All versions

RT-N12+: All versions

RT-N12: D1

RT-N11P: All versions

RT-AC5300: All versions

RT-AC3200: All versions

RT-AC3100: All versions

RT-AC1750: All versions

RT-AC1200: All versions

RT-AC88U: All versions

RT-AC87U: All versions

RT-AC87R: All versions

RT-AC68R: All versions

RT-AC68P: All versions

RT-AC68W: All versions

RT-AC66W: All versions

RT-AC68UF: All versions

RT-AC68U: All versions

RT-AC66U: All versions

RT-AC56U: All versions

RT-AC56S: All versions

RT-AC56R: All versions

RT-AC55U: All versions

RT-AC52U B1: All versions

RT-AC51U: All versions

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External links
http://bierbaumer.net/security/asuswrt/#cross-site-scripting-xss

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.