# CVE-2011-1471: Integer overflow in n/a

> Attackers can cause denial of service via CPU consumption by tricking users into opening a malformed archive file in PHP's Zip extension.

- **Severity:** Medium 4.3 (`AV:N/AC:M/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 20 Mar 2011
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-h5g9-76vr-9xfh

## What is CVE-2011-1471?

CVE-2011-1471 is a medium-severity vulnerability in Php Php, published on 20 Mar 2011. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Integer signedness error in zip_stream.c in the Zip extension in PHP before 5.3.6 allows context-dependent attackers to cause a denial of service (CPU consumption) via a malformed archive file that triggers errors in zip_fread function calls.

Weakness: CWE-189

## Which versions are affected by CVE-2011-1471?

It affects 1 product.


Products: Php Php.

## How do I fix CVE-2011-1471?

Upgrade to a fixed version.

## Is CVE-2011-1471 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2011-1471 exists.

Public exploit code:

- PHP < 5.3.6 'Zip' Extension - 'zip_fread()' Denial of Service (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-2011-1471 and fix it if it is affected.

What it is: CVE-2011-1471 is a medium-severity vulnerability in Php Php, published on 20 Mar 2011. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2011-1471 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-2011-1471/ (Markdown: https://insights.sbomify.com/CVE-2011-1471/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2011-1471
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-1471
- OSV: https://osv.dev/vulnerability/CVE-2011-1471

---
From sbomify Insights: https://insights.sbomify.com/CVE-2011-1471/
Summaries are generated and may contain mistakes; the official description above is the record.