Advisory Details

May 4th, 2023

D-Link DIR-2640 PrefixLen Command Injection Remote Code Execution Vulnerability

ZDI-23-542
ZDI-CAN-19547

CVE ID CVE-2023-32150
CVSS SCORE 6.8, AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS D-Link
AFFECTED PRODUCTS DIR-2640
VULNERABILITY DETAILS

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DIR-2640 routers. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed.

The specific flaw exists within the handling of the PrefixLen parameter provided to the HNAP1 endpoint. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root.

ADDITIONAL DETAILS D-Link has issued an update to correct this vulnerability. More details can be found at:
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10323
DISCLOSURE TIMELINE
  • 2022-12-22 - Vulnerability reported to vendor
  • 2023-05-04 - Coordinated public release of advisory
CREDIT Anonymous
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