CVE-2024-4577 on CISA KEV

In PHP versions 8.1.* before 8.1.29, 8.2.* before 8.2.20, 8.3.* before 8.3.8, when using Apache and PHP-CGI on Windows, if the system is set up to use certain code pages, Windows may use "Best-Fit" behavior to replace characters in command line given to Win32 API functi

01What CISA says about this vulnerability

In PHP versions 8.1.* before 8.1.29, 8.2.* before 8.2.20, 8.3.* before 8.3.8, when using Apache and PHP-CGI on Windows, if the system is set up to use certain code pages, Windows may use "Best-Fit" behavior to replace characters in command line given to Win32 API functions. PHP CGI module may misinterpret those characters as PHP options, which may allow a malicious user to pass options to PHP…

02Required action — verbatim from CISA

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

03Notes & references

• github.com — https://github.com/php/php-src/security/advisories/GHSA-3qgc-jrrr-25jv
• blog.orange.tw — https://blog.orange.tw/2024/06/cve-2024-4577-yet-another-php-rce.html
• devco.re — https://devco.re/blog/2024/06/06/security-alert-cve-2024-4577-php-cgi-argument-i…
• arstechnica.com — https://arstechnica.com/security/2024/06/php-vulnerability-allows-attackers-to-r…
• www.imperva.com — https://www.imperva.com/blog/imperva-protects-against-critical-php-vulnerability…
• github.com — https://github.com/11whoami99/CVE-2024-4577
• github.com — https://github.com/xcanwin/CVE-2024-4577-PHP-RCE
• github.com — https://github.com/rapid7/metasploit-framework/pull/19247
• labs.watchtowr.com — https://labs.watchtowr.com/no-way-php-strikes-again-cve-2024-4577/
• github.com — https://github.com/watchtowrlabs/CVE-2024-4577
• www.php.net — https://www.php.net/ChangeLog-8.php#8.1.29
• www.php.net — https://www.php.net/ChangeLog-8.php#8.2.20
• www.php.net — https://www.php.net/ChangeLog-8.php#8.3.8
• cert.be — https://cert.be/en/advisory/warning-php-remote-code-execution-patch-immediately
• isc.sans.edu — https://isc.sans.edu/diary/30994
• www.openwall.com — http://www.openwall.com/lists/oss-security/2024/06/07/1
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/[email protected]…
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/[email protected]…
• security.netapp.com — https://security.netapp.com/advisory/ntap-20240621-0008/

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
PHP Group	PHP	8.1.*, 8.2.*, 8.3.*

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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