# CVE-2019-18902: wicked: Use-after-free when receiving invalid DHCP6 client options

> Remote attackers can trigger a use-after-free in wicked via invalid DHCP6 options, causing denial of service or potential code execution on SUSE systems.

- **Severity:** High 7.5 (`CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 2 Mar 2020
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-vj69-jmfq-4mjc

## What is CVE-2019-18902?

CVE-2019-18902 is a high-severity use after free vulnerability in Opensuse Leap, published on 2 Mar 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A Use After Free vulnerability in wicked of SUSE Linux Enterprise Server 12, SUSE Linux Enterprise Server 15; openSUSE Leap 15.1, Factory allows remote attackers to cause DoS or potentially code execution. This issue affects: SUSE Linux Enterprise Server 12 wicked versions prior to 0.6.60-3.5.1. SUSE Linux Enterprise Server 15 wicked versions prior to 0.6.60-3.21.1. openSUSE Leap 15.1 wicked versions prior to 0.6.60-lp151.2.6.1. openSUSE Factory wicked versions prior to 0.6.62.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2019-18902?

It affects 2 products.


Products: Opensuse Leap, Suse Linux Enterprise Server.

## How do I fix CVE-2019-18902?

Apply the vendor's patch.

## Is CVE-2019-18902 being exploited?

There is no known exploitation of CVE-2019-18902 in the wild and no public exploit code.

## Other vulnerabilities in Opensuse Leap

- [CVE-2015-4902](https://insights.sbomify.com/CVE-2015-4902/): Oracle Java SE Integrity Check (medium 5.3, exploited in the wild)
- [CVE-2017-14804](https://insights.sbomify.com/CVE-2017-14804/): package builds could use directory traversal to write outside of target area (critical 9.9)
- [CVE-2019-20787](https://insights.sbomify.com/CVE-2019-20787/): Teeworlds before 0.7.4 has an integer overflow when computing a tilemap size. (critical 9.8)
- [CVE-2019-8341](https://insights.sbomify.com/CVE-2019-8341/): Code injection in n/a (critical 9.8)
- [CVE-2019-6438](https://insights.sbomify.com/CVE-2019-6438/): Other in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-18902 and fix it if it is affected.

What it is: CVE-2019-18902 is a high-severity use after free vulnerability in Opensuse Leap, published on 2 Mar 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-18902 in the wild and no public exploit code.

Affected product: Opensuse Leap. 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-2019-18902/ (Markdown: https://insights.sbomify.com/CVE-2019-18902/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-18902
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-18902
- OSV: https://osv.dev/vulnerability/CVE-2019-18902

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-18902/
Summaries are generated and may contain mistakes; the official description above is the record.