# CVE-2017-18199: Null dereference in n/a

> Remote attackers can cause a denial of service via a crafted ISO file due to a NULL pointer dereference in GNU libcdio.

- **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:** 24 Feb 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2017-18199, GHSA-g22c-3rrr-vfp7, SUSE-SU-2020:14498-1, SUSE-SU-2020:3023-1, UBUNTU-CVE-2017-18199

## What is CVE-2017-18199?

CVE-2017-18199 is a medium-severity vulnerability in n/a, published on 24 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

realloc_symlink in rock.c in GNU libcdio before 1.0.0 allows remote attackers to cause a denial of service (NULL Pointer Dereference) via a crafted iso file.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2017-18199?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `libcdio` | SUSE:Linux Enterprise Point of Sale 11 SP3 | All versions | 0.80-8.3.5 |
| `libcdio` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 0.90-6.6.5 |
| `libcdio` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 0.90-6.6.5 |
| `libcdio` | SUSE:Linux Enterprise Software Development Kit 12 SP5 | All versions | 0.90-6.6.5 |
| `libcdio` | SUSE:Linux Enterprise Workstation Extension 12 SP5 | All versions | 0.90-6.6.5 |

Products: Gnu Libcdio.

## How do I fix CVE-2017-18199?

Upgrade to a fixed version.

## Is CVE-2017-18199 being exploited?

There is no known exploitation of CVE-2017-18199 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2017-18201](https://insights.sbomify.com/CVE-2017-18201/): Use after free in n/a (critical 9.8)
- [CVE-2017-18198](https://insights.sbomify.com/CVE-2017-18198/): Memory corruption in n/a (high 8.8)
- [CVE-2024-36600](https://insights.sbomify.com/CVE-2024-36600/): Memory corruption in n/a (high 8.4)
- [CVE-2007-6613](https://insights.sbomify.com/CVE-2007-6613/): Memory corruption in n/a (medium 5.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-18199 and fix it if it is affected.

What it is: CVE-2017-18199 is a medium-severity vulnerability in n/a, published on 24 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-2017-18199 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-2017-18199/ (Markdown: https://insights.sbomify.com/CVE-2017-18199/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-18199
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-18199
- OSV: https://osv.dev/vulnerability/CVE-2017-18199

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-18199/
Summaries are generated and may contain mistakes; the official description above is the record.