# CVE-2024-23923: Alpine Halo9 prh_l2_sar_data_ind Use-After-Free Remote Code Execution Vulnerability

> Network-adjacent attackers can execute arbitrary code with root privileges on Alpine Halo9 devices via a use-after-free flaw in the prh_l2_sar_data_ind function.

- **Severity:** High 8.8 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Sep 2024
- **Updated:** 3 Oct 2024
- **Also known as:** GHSA-4grv-37wf-jg36

## What is CVE-2024-23923?

CVE-2024-23923 is a high-severity use after free vulnerability in Alpine Halo9, published on 28 Sep 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Alpine Halo9 prh_l2_sar_data_ind Use-After-Free Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Alpine Halo9 devices. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the prh_l2_sar_data_ind function. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of root.

Was ZDI-CAN-22945

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2024-23923?

It affects 1 product.


Products: Alpsalpine Ilx-F509 Firmware.

## How do I fix CVE-2024-23923?

No fix has been published for CVE-2024-23923 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-23923 being exploited?

There is no known exploitation of CVE-2024-23923 in the wild and no public exploit code.

## Other vulnerabilities in Alpine Halo9

- [CVE-2024-23963](https://insights.sbomify.com/CVE-2024-23963/): Alpine Halo9 Stack-based Buffer Overflow (high 8.0)
- [CVE-2024-23935](https://insights.sbomify.com/CVE-2024-23935/): Alpine Halo9 DecodeUTF7 Stack-based Buffer Overflow Remote Code Execution Vulnerability (high 8.0)
- [CVE-2024-23924](https://insights.sbomify.com/CVE-2024-23924/): Alpine Halo9 UPDM_wemCmdCreatSHA256Hash Command Injection Remote Code Execution Vulnerability (medium 6.8)
- [CVE-2024-23961](https://insights.sbomify.com/CVE-2024-23961/): Alpine Halo9 UPDM_wemCmdUpdFSpeDecomp Command Injection Remote Code Execution Vulnerability (medium 6.8)
- [CVE-2024-23962](https://insights.sbomify.com/CVE-2024-23962/): Alpine Halo9 Missing Authentication (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-23923 and fix it if it is affected.

What it is: CVE-2024-23923 is a high-severity use after free vulnerability in Alpine Halo9, published on 28 Sep 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-2024-23923 in the wild and no public exploit code.

Affected product: Alpine Halo9. 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-2024-23923/ (Markdown: https://insights.sbomify.com/CVE-2024-23923/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-23923
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-23923
- OSV: https://osv.dev/vulnerability/CVE-2024-23923

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-23923/
Summaries are generated and may contain mistakes; the official description above is the record.