Remote code execution in DrayTek Vigor routers

Published: 2022-08-05

Risk	High
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2022-32548
CWE-ID	CWE-119
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Vigor 3910 Hardware solutions / Routers for home users Vigor 1000B Hardware solutions / Routers for home users Vigor 2962 Hardware solutions / Routers for home users Vigor 2927 Hardware solutions / Routers for home users Vigor 2915 Hardware solutions / Routers for home users Vigor 2952P Hardware solutions / Routers for home users Vigor 2620 Hardware solutions / Routers for home users Vigor 200n Hardware solutions / Routers for home users Vigor 167 Hardware solutions / Routers for home users Vigor 165 Hardware solutions / Routers for home users Vigor 166 Hardware solutions / Routers for home users Vigor 2135 Hardware solutions / Routers for home users Vigor 2765 Hardware solutions / Routers for home users Vigor 2766 Hardware solutions / Routers for home users Vigor 2865 Hardware solutions / Routers for home users Vigor 2866 Hardware solutions / Routers for home users Vigor 2952 Hardware solutions / Routers & switches, VoIP, GSM, etc Vigor 3220 Hardware solutions / Routers & switches, VoIP, GSM, etc Vigor 2926 Hardware solutions / Routers & switches, VoIP, GSM, etc Vigor 2862 Hardware solutions / Routers & switches, VoIP, GSM, etc Vigor 2133 Hardware solutions / Routers & switches, VoIP, GSM, etc Vigor 2762 Hardware solutions / Routers & switches, VoIP, GSM, etc Vigor 130 Hardware solutions / Routers & switches, VoIP, GSM, etc VigorNIC 132 Hardware solutions / Routers & switches, VoIP, GSM, etc Vigor 2832 Hardware solutions / Security hardware applicances
Vendor

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Buffer overflow

EUVDB-ID: #VU66126

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-32548

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target device.

The vulnerability exists due to a boundary error in the login page at "/cgi-bin/wlogin.cgi" script within the web management interface. A remote attacker can send a specially crafted base64-encoded payload via HTTP POST request to the affected script, trigger memory corruption and execute arbitrary code on the device.

Mitigation

Install updates from vendor's website. As a temporary solution disable access to the web management interface.

Vulnerable software versions

Vigor 3910: before 4.3.1.1

Vigor 1000B: before 4.3.1.1

Vigor 2962: before 4.3.1.1

Vigor 2927: before 4.4.0

Vigor 2915: before 4.3.3.2

Vigor 2952: before 3.9.7.2

Vigor 2952P: before 3.9.7.2

Vigor 3220: before 3.9.7.2

Vigor 2926: before 3.9.8.1

Vigor 2862: before 3.9.8.1

Vigor 2620: before 3.9.8.1

Vigor 200n: before 3.9.8.1

Vigor 2133: before 3.9.6.4

Vigor 2762: before 3.9.6.4

Vigor 167: before 5.1.1

Vigor 130: before 3.8.5

VigorNIC 132: before 3.8.5

Vigor 165: before 4.2.4

Vigor 166: before 4.2.4

Vigor 2135: before 4.4.2

Vigor 2765: before 4.4.2

Vigor 2766: before 4.4.2

Vigor 2832: before 3.9.6

Vigor 2865: before 4.4.0

Vigor 2866: before 4.4.0

External links

http://www.trellix.com/en-us/about/newsroom/stories/threat-labs/rce-in-dratyek-routers.html

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.