Executive Summary

This vulnerability exists in the ping diagnostic handler of the /bin/httpd_clientside component in ALTICE LABS / SFR France GR140DG and GR140IG fibre routers. It occurs because user input is inserted directly into a system() call without proper sanitization or validation. Authenticated remote attackers can exploit this by crafting malicious destAddr parameters that use shell command substitution, allowing them to execute arbitrary commands with root privileges on the device.

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Impact Analysis

Exploiting this vulnerability can lead to full device compromise. An attacker with authentication can execute arbitrary commands as root, which may result in credential theft, modification of device configuration, and tampering with the network. This can severely impact the security and functionality of the affected routers.

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Detection Guidance

This vulnerability involves an authenticated root command injection via the ping diagnostic handler in /bin/httpd_clientside on affected ALTICE LABS / SFR France GR140DG and GR140IG routers.

Detection can focus on monitoring for unusual or unauthorized use of the ping diagnostic feature, especially requests to /bin/httpd_clientside with crafted destAddr parameters that include shell command substitution characters.

Since the vulnerability requires authentication, checking WebUI access logs for suspicious activity or unexpected commands executed as root can help detect exploitation attempts.

Specific commands to detect exploitation attempts are not provided in the available resources.

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Mitigation Strategies

• Apply the firmware update to version 3GN8020803R0B or later, which contains the fix for this vulnerability.
• Restrict WebUI access to the local area network (LAN) only to prevent remote exploitation.
• Rotate all credentials used for accessing the device to prevent unauthorized access.
• Disable remote management features to reduce the attack surface.

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Compliance Impact

This vulnerability allows authenticated remote attackers to execute arbitrary commands as root on affected devices, leading to full device compromise, credential theft, configuration modification, and network tampering.

Such impacts can result in unauthorized access to sensitive data and disruption of network security controls, which may lead to non-compliance with common standards and regulations like GDPR and HIPAA that require protection of personal and sensitive information.

However, the provided information does not explicitly discuss compliance implications or specific regulatory impacts.

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