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-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 | |
| PHP | <8.3.12 | 8.3.12 |
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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
Frequently Asked Questions
What is the severity of CVE-2024-8927?
CVE-2024-8927 has a high severity due to its potential to allow unauthorized access to PHP scripts.
How do I fix CVE-2024-8927?
To fix CVE-2024-8927, update PHP to versions 8.3.12, 8.2.26-1~deb12u1, or 8.2.27 as appropriate.
Which versions of PHP are affected by CVE-2024-8927?
CVE-2024-8927 affects PHP versions from 8.1.0 to 8.1.30, 8.2.0 to 8.2.24, and from 8.3.0 to 8.3.12.
What configuration settings can mitigate CVE-2024-8927?
Setting cgi.force_redirect to a value that restricts access can mitigate the risks associated with CVE-2024-8927.
Is CVE-2024-8927 related to other PHP vulnerabilities?
Yes, CVE-2024-8927 is related to previous vulnerabilities affecting PHP’s handling of CGI scripts.
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