Remote buffer overflow in D-Link DIR-850L

1) Stack-based buffer overflow

EUVDB-ID: #VU5931

Risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2017-3193

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when processing requests within the web administration interface HNAP service. A remote attacker can send a specially crafted HTTP POST request to http://<router-ip>/HNAP1/ address with modified HNAP_AUTH and SOAPAction headers, trigger stack-based buffer overflow and execute arbitrary code on the target system with root privileges.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable device.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability. As a temporary solution it is recommended to block access to management interface.

Vulnerability was reported in DIR-850L, firmware versions 1.14B07, 2.07.B05. Other versions may also be affected.

Vulnerable software versions

DIR-850L: Rev.B1 2.06 - 2.07.B05

CPE2.3

• cpe:2.3:h:d-link:dir-850l:Rev.B1 2.06:*:*:*:*:*:*:*
• cpe:2.3:h:d-link:dir-850l:Rev.B1 2.07:*:*:*:*:*:*:*
• cpe:2.3:h:d-link:dir-850l:1.14B07:*:*:*:*:*:*:*

External links

https://www.kb.cert.org/vuls/id/305448

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

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.