# CVE-2007-1700: Use after free in n/a

> Attackers can execute arbitrary code by exploiting a use-after-free vulnerability in the PHP session extension's reference counting mechanism.

- **Severity:** High 7.5 (`AV:N/AC:L/Au:N/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 27 Mar 2007
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-2966-gh5h-j633

## What is CVE-2007-1700?

CVE-2007-1700 is a high-severity use after free vulnerability in Php Php, published on 27 Mar 2007. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

## Which versions are affected by CVE-2007-1700?

It affects 1 product.


Products: Php Php.

## How do I fix CVE-2007-1700?

Upgrade to a fixed version.

## Is CVE-2007-1700 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2007-1700 exists.

Public exploit code:

- PHP < 4.4.5/5.2.1 - '_SESSION unset()' Local Overflow (exploitdb)

## Other vulnerabilities in Php Php

- [CVE-2012-2688](https://insights.sbomify.com/CVE-2012-2688/): Integer overflow in n/a (critical 10.0)
- [CVE-2012-2376](https://insights.sbomify.com/CVE-2012-2376/): Memory corruption in n/a (critical 10.0)
- [CVE-2011-3268](https://insights.sbomify.com/CVE-2011-3268/): Memory corruption in n/a (critical 10.0)
- [CVE-2009-4143](https://insights.sbomify.com/CVE-2009-4143/): Other in n/a (critical 10.0)
- [CVE-2008-5557](https://insights.sbomify.com/CVE-2008-5557/): Memory corruption in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2007-1700 and fix it if it is affected.

What it is: CVE-2007-1700 is a high-severity use after free vulnerability in Php Php, published on 27 Mar 2007. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2007-1700 exists.

Affected product: Php Php. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2007-1700/ (Markdown: https://insights.sbomify.com/CVE-2007-1700/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2007-1700
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2007-1700
- OSV: https://osv.dev/vulnerability/CVE-2007-1700

---
From sbomify Insights: https://insights.sbomify.com/CVE-2007-1700/
Summaries are generated and may contain mistakes; the official description above is the record.