# CVE-2013-5018: Integer overflow in n/a

> Remote attackers can cause a denial of service in strongSwan via crafted ASN.1 data triggering an integer overflow and segmentation fault.

- **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:** 28 Aug 2013
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-7xq3-j5px-xf94

## What is CVE-2013-5018?

CVE-2013-5018 is a medium-severity vulnerability in Opensuse Opensuse, published on 28 Aug 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The is_asn1 function in strongSwan 4.1.11 through 5.0.4 does not properly validate the return value of the asn1_length function, which allows remote attackers to cause a denial of service (segmentation fault) via a (1) XAuth username, (2) EAP identity, or (3) PEM encoded file that starts with a 0x04, 0x30, or 0x31 character followed by an ASN.1 length value that triggers an integer overflow.

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

## Which versions are affected by CVE-2013-5018?

It affects 2 products.


Products: Opensuse Opensuse, Strongswan Strongswan.

## How do I fix CVE-2013-5018?

Upgrade to a fixed version.

## Is CVE-2013-5018 being exploited?

There is no known exploitation of CVE-2013-5018 in the wild and no public exploit code.

## Other vulnerabilities in Opensuse Opensuse

- [CVE-2015-5957](https://insights.sbomify.com/CVE-2015-5957/): Memory corruption in n/a (critical 10.0)
- [CVE-2015-0491](https://insights.sbomify.com/CVE-2015-0491/): Memory corruption in n/a (critical 10.0)
- [CVE-2008-2388](https://insights.sbomify.com/CVE-2008-2388/): Integer overflow in n/a (critical 10.0)
- [CVE-2010-1866](https://insights.sbomify.com/CVE-2010-1866/): Integer overflow in n/a (critical 9.8)
- [CVE-2015-0492](https://insights.sbomify.com/CVE-2015-0492/): Other in n/a (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2013-5018 and fix it if it is affected.

What it is: CVE-2013-5018 is a medium-severity vulnerability in Opensuse Opensuse, published on 28 Aug 2013. 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-2013-5018 in the wild and no public exploit code.

Affected product: Opensuse Opensuse. 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-2013-5018/ (Markdown: https://insights.sbomify.com/CVE-2013-5018/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2013-5018
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2013-5018
- OSV: https://osv.dev/vulnerability/CVE-2013-5018

---
From sbomify Insights: https://insights.sbomify.com/CVE-2013-5018/
Summaries are generated and may contain mistakes; the official description above is the record.