# CVE-2022-40320: Memory corruption in n/a

> A heap-based buffer over-read in libConfuse allows attackers to cause denial of service or disclose sensitive memory contents.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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:** 9 Sep 2022
- **Updated:** 3 Aug 2024
- **Also known as:** AZL-10925, AZL-34910, DEBIAN-CVE-2022-40320, GHSA-4f2q-2458-j6j8, MGASA-2022-0387, OESA-2022-1928, SUSE-SU-2022:3331-1, SUSE-SU-2022:3807-1, UBUNTU-CVE-2022-40320, openSUSE-SU-2024:12324-1

## What is CVE-2022-40320?

CVE-2022-40320 is a high-severity memory corruption vulnerability in Fedoraproject Fedora, published on 9 Sep 2022. 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

cfg_tilde_expand in confuse.c in libConfuse 3.3 has a heap-based buffer over-read.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2022-40320?

It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `libconfuse0` | SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS | All versions | 2.8-150000.3.3.1 |
| `libconfuse0` | SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | All versions | 2.8-150000.3.3.1 |
| `libconfuse0` | SUSE:Linux Enterprise High Performance Computing 15 SP2-ESPOS | All versions | 2.8-150000.3.3.1 |
| `libconfuse0` | SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | All versions | 2.8-150000.3.3.1 |
| `libconfuse0` | SUSE:Linux Enterprise High Performance Computing 15-ESPOS | All versions | 2.8-150000.3.3.1 |
| `libconfuse0` | SUSE:Linux Enterprise High Performance Computing 15-LTSS | All versions | 2.8-150000.3.3.1 |
| `libconfuse0` | SUSE:Linux Enterprise Module for HPC 12 | All versions | 2.8-3.6.1 |
| `libconfuse0` | SUSE:Linux Enterprise Module for HPC 15 SP3 | All versions | 2.8-150000.3.3.1 |
| `libconfuse0` | SUSE:Linux Enterprise Module for Package Hub 15 SP3 | All versions | 2.8-150000.3.3.1 |
| `libconfuse0` | SUSE:Linux Enterprise Module for Package Hub 15 SP4 | All versions | 2.8-150000.3.3.1 |
| `libconfuse0` | openSUSE:Leap 15.3 | All versions | 2.8-150000.3.3.1 |
| `libconfuse0` | openSUSE:Leap 15.4 | All versions | 2.8-150000.3.3.1 |

Products: Fedoraproject Fedora, Libconfuse Project Libconfuse.

## How do I fix CVE-2022-40320?

Upgrade to a fixed version.

## Is CVE-2022-40320 being exploited?

There is no known exploitation of CVE-2022-40320 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-40320 and fix it if it is affected.

What it is: CVE-2022-40320 is a high-severity memory corruption vulnerability in Fedoraproject Fedora, published on 9 Sep 2022. 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-2022-40320 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2022-40320/ (Markdown: https://insights.sbomify.com/CVE-2022-40320/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-40320
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-40320
- OSV: https://osv.dev/vulnerability/CVE-2022-40320

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-40320/
Summaries are generated and may contain mistakes; the official description above is the record.