#VU10256 Security restrictions bypass in AsusWRT - CVE-2018-6000

Vulnerability identifier: #VU10256

Vulnerability risk: Low

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:A/U:Clear]

CVE-ID: CVE-2018-6000

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
AsusWRT
Hardware solutions / Firmware

Vendor: Asus

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

The weakness exists due to a flaw in the do_vpnupload_post function in router/httpd/web.c in vpnupload.cgi. A remote attacker can send a specially crafted HTTP POST request and bypass security restrictions, set the admin password and launch an SSH daemon.

Mitigation
Update to version 3.0.0.4.384_10007 or later.

Vulnerable software versions

AsusWRT: 3.0.0.4.380.7743

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External links
https://blogs.securiteam.com/index.php/archives/3589

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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, a fully functional exploit for this vulnerability is available.