CVE-2021-34862: D-Link DAP-2020 webproc var:menu Stack-based Buffer Overflow Remote Code Execution Vulnerability
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 1.01rc001 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the var:menu parameter provided to the webproc endpoint. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-13270.
Other sources
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the var:menu parameter provided to the webproc endpoint. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is CVE-2021-34862?
CVE-2021-34862 is a vulnerability that allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 1.01rc001 routers.
How severe is CVE-2021-34862?
CVE-2021-34862 has a severity score of 8.8 (high).
What is the affected software of CVE-2021-34862?
The affected software is D-Link DAP-2020 1.01rc001 routers.
Is authentication required to exploit CVE-2021-34862?
No, authentication is not required to exploit this vulnerability.
How can I fix CVE-2021-34862?
Apply the security patch provided by D-Link for the DAP-2020 1.01rc001 routers.