Vulnerability identifier: #VU27057

Vulnerability risk: Low

CVSSv3.1: 8.3 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C]

CVE-ID: CVE-2020-9278

CWE-ID: CWE-284

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
DSL-2640B
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: D-Link

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in "rebootinfo.cgi", "ppppasswordinfo.cgi", "qosqueue.cmd?action=savReboot" and "restoreinfo.cgi" URLs. A remote attacker on the local network can access a specific URL, bypass implemented security restrictions and reset the device to its default configuration.

This vulnerability affects devices with the following versions:

• Hardware version: B2
• Firmware version: ver.4.01

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

DSL-2640B: 4.01

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External links
http://raelize.com/advisories/CVE-2020-9278_D-Link-DSL-2640B_Unauthenticated-configuration-reset_v1.0.txt
http://raelize.com/posts/d-link-dsl-2640b-security-advisories/
http://www.dlink.com/en/security-bulletin

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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 local network (LAN).

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.