Netgear RAX30 Telnet CLI stack-based overflow

Summaryinfo

A vulnerability categorized as critical has been discovered in Netgear RAX30. Affected by this issue is some unknown functionality of the component Telnet CLI. Such manipulation leads to stack-based overflow. This vulnerability is traded as CVE-2023-40478. Access to the local network is required for this attack to succeed. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Netgear RAX30 (Wireless LAN Software) (affected version unknown). Affected by this issue is an unknown functionality of the component Telnet CLI. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability. CVE summarizes:

NETGEAR RAX30 Telnet CLI passwd Stack-based Buffer Overflow Remote Code Execution Vulnerability. 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. Was ZDI-CAN-20009.

The weakness was shared 08/23/2023 as ZDI-23-1163. The advisory is available at zerodayinitiative.com. This vulnerability is handled as CVE-2023-40478 since 08/14/2023. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 01/03/2025).

Upgrading eliminates this vulnerability. The upgrade is hosted for download at kb.netgear.com.

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Productinfo

Type

• Wireless LAN Software

Vendor

• Netgear

Name

• RAX30

License

• commercial

Website

• Vendor: https://www.netgear.com/

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