# CVE-2018-6542: Memory corruption in n/a

> A bus error in ZZIPlib caused by misaligned memory access allows attackers to cause a denial of service via crafted disk64_trailer seek values.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **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:** 2 Feb 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-6542, ECHO-46fc-3288-0ab3, GHSA-66ww-fgg3-pc35, SUSE-SU-2018:1507-1

## What is CVE-2018-6542?

CVE-2018-6542 is a medium-severity memory corruption vulnerability in n/a, published on 2 Feb 2018. 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

In ZZIPlib 0.13.67, there is a bus error (when handling a disk64_trailer seek value) caused by loading of a misaligned address in the zzip_disk_findfirst function of zzip/mmapped.c.

## Which versions are affected by CVE-2018-6542?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `zziplib` | SUSE:Linux Enterprise Desktop 12 SP3 | All versions | 0.13.67-10.11.1 |
| `zziplib` | SUSE:Linux Enterprise Software Development Kit 12 SP3 | All versions | 0.13.67-10.11.1 |
| `zziplib` | SUSE:Linux Enterprise Workstation Extension 12 SP3 | All versions | 0.13.67-10.11.1 |

Products: Gdraheim Zziplib.

## How do I fix CVE-2018-6542?

Upgrade to a fixed version.

## Is CVE-2018-6542 being exploited?

There is no known exploitation of CVE-2018-6542 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2024-39134](https://insights.sbomify.com/CVE-2024-39134/): Memory corruption in n/a (high 7.5)
- [CVE-2018-16548](https://insights.sbomify.com/CVE-2018-16548/): Denial of service in n/a (medium 6.5)
- [CVE-2018-7727](https://insights.sbomify.com/CVE-2018-7727/): Denial of service in n/a (medium 6.5)
- [CVE-2020-18770](https://insights.sbomify.com/CVE-2020-18770/): Denial of service in n/a (medium 5.5)
- [CVE-2018-17828](https://insights.sbomify.com/CVE-2018-17828/): Path traversal in n/a (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-6542 and fix it if it is affected.

What it is: CVE-2018-6542 is a medium-severity memory corruption vulnerability in n/a, published on 2 Feb 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2018-6542 in the wild and no public exploit code.

Affected product: n/a. 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-2018-6542/ (Markdown: https://insights.sbomify.com/CVE-2018-6542/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-6542
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-6542
- OSV: https://osv.dev/vulnerability/CVE-2018-6542

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-6542/
Summaries are generated and may contain mistakes; the official description above is the record.