# CVE-2015-2171: Slim vulnerable to PHP object injection

> Remote attackers can execute arbitrary PHP code via crafted session data in the Slim framework's session middleware.

- **Severity:** High 7.5 (`AV:N/AC:L/Au:N/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 30 Mar 2015
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-74mf-vjpg-9xh7

## What is CVE-2015-2171?

CVE-2015-2171 is a high-severity unsafe deserialization vulnerability in n/a, published on 30 Mar 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Middleware/SessionCookie.php in Slim before 2.6.0 allows remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via crafted session data.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2015-2171?

2 open source packages ship an affected version, including slim/slim. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `slim/slim` | Packagist | All versions | 2.6.0 |
| `slim/slim` | Packagist | All versions | 2.6.0 |

Products: Slimframework Slim.

## How do I fix CVE-2015-2171?

Upgrade slim/slim to 2.6.0 or later.

## Is CVE-2015-2171 being exploited?

There is no known exploitation of CVE-2015-2171 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-2171 and fix it if it is affected.

What it is: CVE-2015-2171 is a high-severity unsafe deserialization vulnerability in n/a, published on 30 Mar 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2015-2171 in the wild and no public exploit code.

Affected packages and fixed versions:
- slim/slim (Packagist): affected all versions; fixed in 2.6.0
- slim/slim (Packagist): affected all versions; fixed in 2.6.0

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-2015-2171/ (Markdown: https://insights.sbomify.com/CVE-2015-2171/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-2171
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-2171
- OSV: https://osv.dev/vulnerability/CVE-2015-2171

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-2171/
Summaries are generated and may contain mistakes; the official description above is the record.