# CVE-2023-37732: Null dereference in n/a

> An attacker can cause a denial of service in the Yasm assembler library by providing a crafted file that triggers a null pointer dereference.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/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:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 26 Jul 2023
- **Updated:** 23 Oct 2024
- **Also known as:** AZL-27658, AZL-35395, DEBIAN-CVE-2023-37732, GHSA-4p37-82f3-xmhv, OESA-2023-1508, UBUNTU-CVE-2023-37732

## What is CVE-2023-37732?

CVE-2023-37732 is a medium-severity vulnerability in n/a, published on 26 Jul 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Yasm v1.3.0.78 was found prone to NULL Pointer Dereference in /libyasm/intnum.c and /elf/elf.c, which allows the attacker to cause a denial of service via a crafted file.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2023-37732?

It affects 1 product.


Products: Yasm Project Yasm.

## How do I fix CVE-2023-37732?

Apply the vendor's patch.

## Is CVE-2023-37732 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-37732 exists.

## Other vulnerabilities in n/a

- [CVE-2023-31724](https://insights.sbomify.com/CVE-2023-31724/): Null dereference in n/a (high 7.8)
- [CVE-2023-29583](https://insights.sbomify.com/CVE-2023-29583/): Memory corruption in n/a (medium 6.2)
- [CVE-2023-49554](https://insights.sbomify.com/CVE-2023-49554/): Use after free in n/a (medium 5.5)
- [CVE-2023-49555](https://insights.sbomify.com/CVE-2023-49555/): Denial of service in n/a (medium 5.5)
- [CVE-2023-49556](https://insights.sbomify.com/CVE-2023-49556/): Memory corruption in n/a (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-37732 and fix it if it is affected.

What it is: CVE-2023-37732 is a medium-severity vulnerability in n/a, published on 26 Jul 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-37732 exists.

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-2023-37732/ (Markdown: https://insights.sbomify.com/CVE-2023-37732/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-37732
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-37732
- OSV: https://osv.dev/vulnerability/CVE-2023-37732

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-37732/
Summaries are generated and may contain mistakes; the official description above is the record.