CVE-2024-8927: cgi.force_redirect configuration is bypassable due to the environment variable collision
First published: Thu Sep 26 2024(Updated: )
According to <a href="https://www.php.net/manual/en/security.cgi-bin.force-redirect.php">https://www.php.net/manual/en/security.cgi-bin.force-redirect.php</a>, the configuration directive cgi.force_redirect prevents anyone from calling PHP directly with a URL like <a href="http://host.example/cgi-bin/php/secretdir/script.php">http://host.example/cgi-bin/php/secretdir/script.php</a>. The default value of cgi.force_redirect is 1. But there is a bug that can cause attackers to bypass restrictions and access php-cgi directly.
Credit: security@php.net security@php.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| PHP PHP | <8.3.12 | 8.3.12 |
| Php-fpm Php-fpm | >=8.1.0<8.1.30 | |
| Php-fpm Php-fpm | >=8.2.0<8.2.24 | |
| Php-fpm Php-fpm | >=8.3.0<8.3.12 | |
| debian/php7.4 | <=7.4.33-1+deb11u5 | 7.4.33-1+deb11u7 |
| debian/php8.2 | 8.2.26-1~deb12u1 8.2.27-1 |
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Reference Links
- https://www.php.net/ChangeLog-8.php#8.3.12 (Advisory)
- https://github.com/php/php-src/security/advisories/GHSA-94p6-54jq-9mwp
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-8927
- https://nvd.nist.gov/vuln/detail/CVE-2024-8927
- https://launchpad.net/bugs/cve/CVE-2024-8927
- https://security-tracker.debian.org/tracker/CVE-2024-8927
- https://ubuntu.com/security/CVE-2024-8927
- https://github.com/php/php-src/commit/48808d98f4fc2a05193cdcc1aedd6c66816450f1
- https://www.php.net/manual/en/security.cgi-bin.force-redirect.php
- http://host.example/cgi-bin/php/secretdir/script.php
- https://access.redhat.com/errata/RHSA-2024:10952
- https://access.redhat.com/errata/RHSA-2024:10950
- https://access.redhat.com/errata/RHSA-2024:10949
- https://access.redhat.com/errata/RHSA-2024:10951
- https://bugzilla.redhat.com/show_bug.cgi?id=2317051
- agent/first-publish-date
- agent/type
- collector/php-changelog
- source/PHP
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- agent/severity
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- source/Red Hat
- alias/CVE-2024-8927
- agent/last-modified-date
- agent/epss
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- vendor/php
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- vendor/php-fpm
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