# CVE-2023-24626: Privilege escalation in n/a

> Local users can send privileged signals to arbitrary processes via GNU Screen, causing denial of service or process disruption.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/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:** 8 Apr 2023
- **Updated:** 9 May 2025
- **Also known as:** ALPINE-CVE-2023-24626, AZL-26216, CLSA-2026-1776934758, CLSA-2026-1776940861, DEBIAN-CVE-2023-24626, GHSA-wr4w-95gx-6cfr, MGASA-2024-0057, OESA-2023-1263, UBUNTU-CVE-2023-24626, USN-6198-1, openSUSE-SU-2024:13285-1

## What is CVE-2023-24626?

CVE-2023-24626 is a medium-severity vulnerability in n/a, published on 8 Apr 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

socket.c in GNU Screen through 4.9.0, when installed setuid or setgid (the default on platforms such as Arch Linux and FreeBSD), allows local users to send a privileged SIGHUP signal to any PID, causing a denial of service or disruption of the target process.

Weakness: CWE-732 (Incorrect Permission Assignment for Critical Resource)

## Which versions are affected by CVE-2023-24626?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `screen` | openSUSE:Tumbleweed | All versions | 4.9.1-1.1 |

Products: Gnu Screen.

## How do I fix CVE-2023-24626?

Apply the vendor's patch.

## Is CVE-2023-24626 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-24626 exists.

Public exploit code:

- GNU screen v4.9.0 - Privilege Escalation (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2003-0972](https://insights.sbomify.com/CVE-2003-0972/): Integer overflow in n/a (critical 10.0)
- [CVE-2020-9366](https://insights.sbomify.com/CVE-2020-9366/): Memory corruption in n/a (critical 9.8)
- [CVE-2017-5618](https://insights.sbomify.com/CVE-2017-5618/): Privilege escalation in n/a (high 7.8)
- [CVE-2007-3048](https://insights.sbomify.com/CVE-2007-3048/): Auth bypass in n/a (high 7.2)
- [CVE-2009-1214](https://insights.sbomify.com/CVE-2009-1214/): Information disclosure in n/a (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-24626 and fix it if it is affected.

What it is: CVE-2023-24626 is a medium-severity vulnerability in n/a, published on 8 Apr 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-24626 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-2023-24626/ (Markdown: https://insights.sbomify.com/CVE-2023-24626/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-24626
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-24626
- OSV: https://osv.dev/vulnerability/CVE-2023-24626

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-24626/
Summaries are generated and may contain mistakes; the official description above is the record.