ZDI-CAN-21671: ZDI-23-1337: D-Link DIR-3040 HTTP Request Processing Referer Heap-Based Buffer Overflow Remote Code Execution Vulnerability
First published: Thu Sep 07 2023(Updated: )
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DIR-3040 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the prog.cgi binary, which handles HNAP requests made to the lighttpd webserver listening on TCP ports 80 and 443. The issue results from the lack of proper validation of a user-supplied string before copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of root.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| D-Link DIR-3040 Firmware |
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Reference Links
Frequently Asked Questions
What is the severity of ZDI-CAN-21671?
The severity of ZDI-CAN-21671 is critical due to the ability for network-adjacent attackers to execute arbitrary code without authentication.
How do I fix ZDI-CAN-21671?
To fix ZDI-CAN-21671, update your D-Link DIR-3040 router firmware to the latest version provided by D-Link.
Who is affected by ZDI-CAN-21671?
ZDI-CAN-21671 affects installations of the D-Link DIR-3040 router.
What type of attacks can be performed using ZDI-CAN-21671?
ZDI-CAN-21671 allows attackers to execute arbitrary code on the router, potentially giving them control over the device.
Is authentication required to exploit ZDI-CAN-21671?
No, authentication is not required to exploit ZDI-CAN-21671, making it easily exploitable by network-adjacent attackers.
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