TP-Link Archer AX21 tmpServer Command stack-based overflow

Summaryinfo

A vulnerability, which was classified as critical, has been found in TP-Link Archer AX21. Affected is an unknown function of the component tmpServer Command Handler. This manipulation causes stack-based overflow. This vulnerability is registered as CVE-2023-27333. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in TP-Link Archer AX21 (affected version unknown). It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component tmpServer Command Handler. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is 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). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

TP-Link Archer AX21 tmpServer Command 0x422 Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link Archer AX21 routers. Authentication is required to exploit this vulnerability. The specific flaw exists within the handling of command 0x422 provided to the tmpServer service. 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-19905.

The weakness was published 03/30/2023. It is possible to read the advisory at zerodayinitiative.com. This vulnerability is known as CVE-2023-27333 since 02/28/2023. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/18/2024).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• TP-Link

Name

• Archer AX21

License

• commercial

Website

• Vendor: https://www.tp-link.com/

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