# CVE-2017-9225: Memory corruption in n/a

> A stack buffer overflow in the Oniguruma regex library allows attackers to execute arbitrary code or cause denial of service via a malformed regular expression.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 May 2017
- **Updated:** 17 Sep 2024
- **Also known as:** DEBIAN-CVE-2017-9225, GHSA-24pf-h82m-5vvv

## What is CVE-2017-9225?

CVE-2017-9225 is a critical memory corruption vulnerability in Php Php, published on 24 May 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A stack out-of-bounds write in onigenc_unicode_get_case_fold_codes_by_str() occurs during regular expression compilation. Code point 0xFFFFFFFF is not properly handled in unicode_unfold_key(). A malformed regular expression could result in 4 bytes being written off the end of a stack buffer of expand_case_fold_string() during the call to onigenc_unicode_get_case_fold_codes_by_str(), a typical stack buffer overflow.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2017-9225?

It affects 3 products.


Products: Oniguruma Project Oniguruma, Php Php, Ruby-Lang Ruby.

## How do I fix CVE-2017-9225?

Upgrade to a fixed version.

## Is CVE-2017-9225 being exploited?

There is no known exploitation of CVE-2017-9225 in the wild and no public exploit code.

## Other vulnerabilities in Php Php

- [CVE-2017-9224](https://insights.sbomify.com/CVE-2017-9224/): Memory corruption in n/a (critical 9.8)
- [CVE-2017-9226](https://insights.sbomify.com/CVE-2017-9226/): Memory corruption in n/a (critical 9.8)
- [CVE-2017-9227](https://insights.sbomify.com/CVE-2017-9227/): Memory corruption in n/a (critical 9.8)
- [CVE-2017-9228](https://insights.sbomify.com/CVE-2017-9228/): Memory corruption in n/a (critical 9.8)
- [CVE-2017-9229](https://insights.sbomify.com/CVE-2017-9229/): Null dereference in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-9225 and fix it if it is affected.

What it is: CVE-2017-9225 is a critical memory corruption vulnerability in Php Php, published on 24 May 2017. 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-2017-9225 in the wild and no public exploit code.

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-2017-9225/ (Markdown: https://insights.sbomify.com/CVE-2017-9225/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-9225
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-9225
- OSV: https://osv.dev/vulnerability/CVE-2017-9225

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-9225/
Summaries are generated and may contain mistakes; the official description above is the record.