# CVE-2007-0988: Denial of service in n/a

> Attackers can cause a denial of service via infinite loop in PHP's unserialize function on 64-bit systems by exploiting integer handling flaws.

- **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:** Not needed
- **Fix available:** Yes
- **Published:** 20 Feb 2007
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-rv23-gf9q-6frc

## What is CVE-2007-0988?

CVE-2007-0988 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 20 Feb 2007. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The zend_hash_init function in PHP 5 before 5.2.1 and PHP 4 before 4.4.5, when running on a 64-bit platform, allows context-dependent attackers to cause a denial of service (infinite loop) by unserializing certain integer expressions, which only cause 32-bit arguments to be used after the check for a negative value, as demonstrated by an "a:2147483649:{" argument.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2007-0988?

It affects 2 products.


Products: Canonical Ubuntu Linux, Php Php.

## How do I fix CVE-2007-0988?

Upgrade to a fixed version.

## Is CVE-2007-0988 being exploited?

There is no known exploitation of CVE-2007-0988 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2007-0988 and fix it if it is affected.

What it is: CVE-2007-0988 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 20 Feb 2007. 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-2007-0988 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. 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-2007-0988/ (Markdown: https://insights.sbomify.com/CVE-2007-0988/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2007-0988
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2007-0988
- OSV: https://osv.dev/vulnerability/CVE-2007-0988

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From sbomify Insights: https://insights.sbomify.com/CVE-2007-0988/
Summaries are generated and may contain mistakes; the official description above is the record.