ZDI-21-248: (Pwn2Own) NETGEAR R7800 udchpd DHCP_REQUEST Command Injection Remote Code Execution Vulnerability

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R7800. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the vendor_specific DHCP opcode. 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.

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• alias/ZDI-21-248
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• alias/CVE-2021-27252
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• canonical/netgear r7800