# CVE-2024-7538: oFono CUSD AT Command Stack-based Buffer Overflow Code Execution Vulnerability

> Local attackers with modem access can execute arbitrary code as root via a stack-based buffer overflow in oFono's AT command parsing.

- **Severity:** High 7.8 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 5 Aug 2024
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2024-7538, GHSA-jchw-pqx7-w4qj, UBUNTU-CVE-2024-7538

## What is CVE-2024-7538?

CVE-2024-7538 is a high-severity memory corruption vulnerability in oFono, published on 5 Aug 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

oFono CUSD AT Command Stack-based Buffer Overflow Code Execution Vulnerability. This vulnerability allows local attackers to execute arbitrary code on affected installations of oFono. An attacker must first obtain the ability to execute code on the target modem in order to exploit this vulnerability.

The specific flaw exists within the parsing of responses from AT Commands. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-23190.

Weakness: CWE-787 (Out-of-bounds Write), CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2024-7538?

It affects 1 product.


Products: Ofono Project Ofono.

## How do I fix CVE-2024-7538?

Apply the vendor's patch.

## Is CVE-2024-7538 being exploited?

There is no known exploitation of CVE-2024-7538 in the wild and no public exploit code.

## Other vulnerabilities in oFono

- [CVE-2024-7539](https://insights.sbomify.com/CVE-2024-7539/): oFono CUSD Stack-based Buffer Overflow Code Execution Vulnerability (high 7.8)
- [CVE-2024-7543](https://insights.sbomify.com/CVE-2024-7543/): oFono SimToolKit Heap-based Buffer Overflow Privilege Escalation Vulnerability (high 7.8)
- [CVE-2024-7544](https://insights.sbomify.com/CVE-2024-7544/): oFono SimToolKit Heap-based Buffer Overflow Privilege Escalation Vulnerability (high 7.8)
- [CVE-2024-7545](https://insights.sbomify.com/CVE-2024-7545/): oFono SimToolKit Heap-based Buffer Overflow Privilege Escalation Vulnerability (high 7.8)
- [CVE-2024-7546](https://insights.sbomify.com/CVE-2024-7546/): oFono SimToolKit Heap-based Buffer Overflow Privilege Escalation Vulnerability (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-7538 and fix it if it is affected.

What it is: CVE-2024-7538 is a high-severity memory corruption vulnerability in oFono, published on 5 Aug 2024. 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-2024-7538 in the wild and no public exploit code.

Affected product: oFono. 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-2024-7538/ (Markdown: https://insights.sbomify.com/CVE-2024-7538/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-7538
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-7538
- OSV: https://osv.dev/vulnerability/CVE-2024-7538

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-7538/
Summaries are generated and may contain mistakes; the official description above is the record.