A new vulnerability has been discovered in the Symfony Runtime component, affecting over 34,000 instances of the Symfony PHP framework and posing a significant security risk to organizations. This flaw allows attackers to manipulate the environment or debug mode, potentially triggering the “dev” environment. This exposes sensitive data and configurations, leaving systems vulnerable to unauthorized access or misconfigurations. Immediate action is recommended to mitigate the impact of this threat and protect critical business operations.

Technical Summary

Symfony/runtime is a module of the Symfony PHP framework designed to decouple PHP applications from the global state. A critical vulnerability exists in versions prior to 5.4.46, 6.4.14, and 7.1.7, where the PHP register_argc_argv directive, if set to on, allows attackers to manipulate the environment or debug mode used by the kernel. This can be triggered by crafting a malicious query string in the URL ?+--env=dev. The issue has been resolved in Symfony versions 5.4.46, 6.4.14, and 7.1.7, where the SymfonyRuntime component now ignores argv values for non-SAPI PHP runtimes.

Recommendations

To mitigate the risk posed by this vulnerability, it is strongly recommended to upgrade to one of the following Symfony versions: 5.4.46, 6.4.14, or 7.1.7.

Upgrading to one of these versions will resolve the issue, as they include a fix that causes the SymfonyRuntime component to ignore argv values for non-SAPI PHP runtimes.

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