Buffer Overflow in TOTOLINK A950RG IPv6 Module Enables Remote Exploit

Executive Summary

This vulnerability is a buffer overflow found in the TOTOLINK A950RG router firmware version V4.1.2cu.5204_B20210112. It occurs in the setRadvdCfg interface within the /lib/cste_modules/ipv6.so module. Specifically, the function does not properly check the length of the user-controlled parameter called radvdinterfacename, which allows a remote attacker to cause a stack buffer overflow.

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Impact Analysis

Exploiting this vulnerability could allow a remote attacker to execute arbitrary code or cause a denial of service on the affected device by triggering a stack buffer overflow. This could lead to unauthorized control over the router, disruption of network services, or compromise of the network environment.

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Detection Guidance

This vulnerability involves a buffer overflow in the setRadvdCfg interface of the /lib/cste_modules/ipv6.so module, specifically related to the radvdinterfacename parameter. Detection would typically involve monitoring for abnormal behavior or crashes related to this module or interface.

Since the vulnerability is triggered by a remote attacker sending a specially crafted radvdinterfacename parameter, detection could involve capturing and analyzing network traffic for suspicious packets targeting the setRadvdCfg interface.

Specific commands or tools to detect this vulnerability are not explicitly provided in the available resources.

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Mitigation Strategies

The provided information does not include explicit mitigation steps or patches for this vulnerability.

General best practices would include restricting access to the vulnerable interface, monitoring for suspicious activity, and applying any available firmware updates from the vendor once released.

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Compliance Impact

I don't know

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