Vulnerability identifier: #VU27055

Vulnerability risk: Low

CVSSv3.1: 6.2 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:U/RC:C]

CVE-ID: CVE-2020-9275

CWE-ID: CWE-200

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 access to potentially sensitive information.

The vulnerability exists due to and error in a cfm UDP service listening on port 65002. A remote attacker on the local network can send a specific UDP packet and cause unauthenticated exfiltration of administrative credentials.

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-2020-9275_D-Link-DSL-2640B_Remote-Credentials-Exfiltration_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.