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Move most of this to https://github.com/php/policies as per Policies RFC
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Derick Rethans
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SECURITY.md
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SECURITY.md
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# Vulnerability Disclosure Policy
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*This document was originally published at <https://wiki.php.net/security>.*
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## Introduction
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For the sake of our users, we classify some of the issues found in PHP
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as "security issues". This document is intended to explain which issues
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are thus classified, how we handle those issues and how to report them.
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## Classification
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We classify as security issues bugs that:
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- allow users to execute unauthorized actions
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- cross security boundaries
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- access data that is not intended to be accessible
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- severely impact accessibility or performance of the system
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The purpose of this classification is to alert the users and the
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developers about the bugs that need to be prioritized in their handling.
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We define three categories of security issues, by their severity,
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described below. Please note that this categorization is in many aspects
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subjective, so it ultimately relies on the judgement of the PHP
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developers.
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### High severity
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These issues may allow:
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- third party to compromise any, or most installations of PHP
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- the execution of arbitrary code
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- disabling the system completely
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- access to any file a local PHP user can access.
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The issue can be triggered on any, or on most typical installations, and
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does not require exotic and non-recommended settings to be triggered.
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This category also includes issues that can be triggered in code or
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functions known to be frequently used (session, json, mysql, openssl,
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etc.) during typical usage, and that require settings or configurations
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that may not be strictly the best practice, but are commonly used.
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This category also may include issues that require special code or code
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pattern if such code or pattern is present in many popular libraries.
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This kind of issues usually requires a CVE report.
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### Medium severity
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These issues may have the same potential to compromise an installation
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as a high severity issue, but may also require:
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- an extension that is not commonly used
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- a particular type of configuration that is used only in narrow
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specific circumstances
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- relies on old version of a third-party library being used
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- code, or patterns of code, that are known to be used infrequently
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- code that is very old, or extremely uncommon (and so is used
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infrequently)
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This kind of issues usually will have a CVE number, unless the required
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configuration is particularly exotic to the point it's not practically
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usable.
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### Low severity
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This issue allows theoretical compromise of security, but practical
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attack is usually impossible or extremely hard due to common practices
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or limitations that are virtually always present or imposed.
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This also includes problems with configuration, documentation, and other
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non-code parts of the PHP project that may mislead users, or cause them
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to make their system, or their code less secure.
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Issues that can trigger unauthorized actions that do not seem to be
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useful for any practical attack can also be categorized as low severity.
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Security issues, that are present only in unstable branches, belong to
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this category, too. Any branch that has no stable release, is per se not
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intended for the production use.
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Low severity issues usually do not need to have CVE and may, at the
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discretion of the PHP developers, be disclosed publicly before the fix
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is released or available.
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### Not a security issue
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We do not classify as a security issue any issue that:
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- requires invocation of specific code, which may be valid but is
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obviously malicious
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- requires invocation of functions with specific arguments, which may
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be valid but are obviously malicious
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- requires specific actions to be performed on the server, which are
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not commonly performed, or are not commonly permissible for the user
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(uid) executing PHP
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- requires privileges superior to that of the user (uid) executing PHP
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- requires the use of debugging facilities - ex. xdebug, var_dump
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- requires the use of settings not recommended for production - ex.
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error reporting to output
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- requires the use of non-standard environment variables - ex.
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USE_ZEND_ALLOC
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- requires the use of non-standard builds - ex. obscure embedded
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platform, not commonly used compiler
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- requires the use of code or settings known to be insecure
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- requires the use of FFI
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- requires an open_basedir bypass
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## Handling issues
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High and medium severity fixes are merged into a private security repository,
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and then merged to the main repository before the release is tagged.
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Low severity fixes are merged immediately after the fix is available and
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handled like all regular bugs are handled consequently. However, release
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managers may choose to pull those fixes into the RC branch after the
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branch is created, and also backport them into a security-only release
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branch.
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## FAQ
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### How do I report a security issue?
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# Reporting Security Issues
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Please report security vulnerabilities on GitHub at:
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<https://github.com/php/php-src/security/advisories/new>
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@ -134,35 +11,7 @@ Vulnerability reports remain private until published. When published, you will
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be credited as a contributor, and your contribution will reflect the MITRE
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Credit System.
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### What do you consider a responsible disclosure?
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# Vulnerability Policy
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Please report the issue as described above. Please communicate with
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the developers about when the fix will be released - usually it's the
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next monthly release after the bug was reported. Some issues can take
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longer. After the fix is released (releases usually happen on Thursdays)
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please feel free to disclose the issue as you see fit.
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### What if I think it's a security issue but the developers disagree?
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Please read the above and try to explain to us why it fits the
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description.
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### What if the developers still don't think it's a security issue?
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We'll have to agree to disagree.
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### The bug I submitted was classified as "not a security issue." You don't believe it's real?
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It has nothing to do with the bug being real or its importance to
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you. It just means it does not fit our specific definitions for issues
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that we will handle in a special way. We fix a lot of non-security bugs
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and pull requests are always welcome.
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### But you classified bug #424242 as a security issue, but not this one?!
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Each bug usually has its aspects, if a short discussion does not
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yield agreement we'd rather do more fixing and less arguing.
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### Do you pay bounties for security issues?
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PHP is a volunteer project. We have no money, thus we can't pay bounties.
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Our full policy is described at
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https://github.com/php/policies/blob/main/security-classification.rst
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