# CVE-2023-31926: Arbitrary File Overwrite using less command

> Attackers can overwrite system files via the less command in Brocade Fabric OS, potentially leading to privilege escalation or system compromise.

- **Severity:** High 7.1 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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:** No
- **Published:** 2 Aug 2023
- **Updated:** 13 Feb 2025
- **Also known as:** GHSA-rc2q-3pmv-73vx

## What is CVE-2023-31926?

CVE-2023-31926 is a high-severity path traversal vulnerability in Brocade Fabric OS, published on 2 Aug 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

System files could be overwritten using the less command in Brocade Fabric OS before Brocade Fabric OS v9.1.1c and v9.2.0.

Weakness: CWE-665 (Improper Initialization), CWE-281 (Improper Preservation of Permissions)

## Which versions are affected by CVE-2023-31926?

It affects 1 product.


Products: Broadcom Brocade Fabric Operating System.

## How do I fix CVE-2023-31926?

No fix has been published for CVE-2023-31926 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-31926 being exploited?

There is no known exploitation of CVE-2023-31926 in the wild and no public exploit code.

## Other vulnerabilities in Brocade Fabric OS

- [CVE-2023-31432](https://insights.sbomify.com/CVE-2023-31432/): Privilege issues in multiple commands (high 7.8)
- [CVE-2021-23133](https://insights.sbomify.com/CVE-2021-23133/): Linux Kernel sctp_destroy_sock race condition (medium 6.7)
- [CVE-2023-31928](https://insights.sbomify.com/CVE-2023-31928/): XSS vulnerability in Brocade Webtools (medium 6.3)
- [CVE-2023-31428](https://insights.sbomify.com/CVE-2023-31428/): CLI allows upload or transfer files of dangerous types (medium 5.5)
- [CVE-2023-31430](https://insights.sbomify.com/CVE-2023-31430/): buffer overflow vulnerability in “secpolicydelete” command (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-31926 and fix it if it is affected.

What it is: CVE-2023-31926 is a high-severity path traversal vulnerability in Brocade Fabric OS, published on 2 Aug 2023. 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-2023-31926 in the wild and no public exploit code.

Affected product: Brocade Fabric OS. 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-2023-31926/ (Markdown: https://insights.sbomify.com/CVE-2023-31926/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-31926
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-31926
- OSV: https://osv.dev/vulnerability/CVE-2023-31926

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-31926/
Summaries are generated and may contain mistakes; the official description above is the record.