Advisory Details

August 22nd, 2023

NETGEAR RAX30 Telnet CLI passwd Stack-based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2023-40478
CVSS SCORE	8.0, AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	NETGEAR
AFFECTED PRODUCTS	RAX30
VULNERABILITY DETAILS	This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR RAX30 routers. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the telnet CLI service, which listens on TCP port 23. 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.
ADDITIONAL DETAILS	NETGEAR has issued an update to correct this vulnerability. More details can be found at: https://kb.netgear.com/000065649/Security-Advisory-for-Post-authentication-Buffer-Overflow-on-the-RAX30-PSV-2023-0002
DISCLOSURE TIMELINE	2023-01-04 - Vulnerability reported to vendor 2023-08-22 - Coordinated public release of advisory
CREDIT	Dmitry "InfoSecDJ" Janushkevich of Trend Micro Zero Day Initiative

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