Unauthenticated Command Injection in Router Diagnostic Handler

The ping diagnostic handler in /bin/httpd_clientside for ALTICE LABS / SFR France GR140DG and GR140IG fibre CPE/Router/Gateway, inserts unsanitized user input into a system() call, allowing authenticated remote attackers to execute arbitrary commands as root via crafted destAddr parameters using shell command substitution.

Casky was already ahead

This CVE exploits attack patterns that Casky's 419matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

This vulnerability exploits improper input sanitization in the ping diagnostic handler of ALTICE LABS fibre CPE devices (GR140DG and GR140IG models), enabling authenticated remote attackers to execute arbitrary commands with root privileges. The flaw stems from unsanitized user input being directly passed to system() calls, where shell command substitution in the destAddr parameter allows attackers to break out of the intended ping command context. Organizations operating SFR France fibre infrastructure and those using compatible ALTICE equipment face critical risk, as successful exploitation grants complete device compromise and potential lateral movement into residential or enterprise networks.

Casky's 419 matched skills leverage Claude's extended reasoning to correlate attack indicators across MITRE ATT&CK techniques TA0001 (Reconnaissance), TA0043 (Reconnaissance—active scanning), and TA0002 (Execution). Practitioners using Casky would identify suspicious patterns including: crafted HTTP requests to /bin/httpd_clientside with shell metacharacters (backticks, $(), pipes) in destAddr parameters; diagnostic service enumeration attempts preceding exploitation; and command execution artifacts in process logs showing root-level activity spawned from httpd context. The platform's skill mapping would flag the progression from initial access through diagnostic endpoint enumeration to privilege escalation, enabling detection at pre-exploitation reconnaissance phases and during active command injection attempts.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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419 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-31195.

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malware analysis · medium

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MITRE ATT&CK Techniques

TA0001 TA0043 TA0002

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