# CVE-2024-54143: openwrt/asu allows build artifact poisoning via truncated SHA-256 hash and command injection

> Attackers can poison build artifacts via hash collisions and inject commands to produce malicious firmware images signed with legitimate keys.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Dec 2024
- **Updated:** 6 Dec 2024
- **Also known as:** GHSA-r3gq-96h6-3v7q

## What is CVE-2024-54143?

CVE-2024-54143 is a critical command injection vulnerability in openwrt asu, published on 6 Dec 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

openwrt/asu is an image on demand server for OpenWrt based distributions. The request hashing mechanism truncates SHA-256 hashes to only 12 characters. This significantly reduces entropy, making it feasible for an attacker to generate collisions. By exploiting this, a previously built malicious image can be served in place of a legitimate one, allowing the attacker to "poison" the artifact cache and deliver compromised images to unsuspecting users. This can be combined with other attacks, such as a command injection in Imagebuilder that allows malicious users to inject arbitrary commands into the build process, resulting in the production of malicious firmware images signed with the legitimate build key. This has been patched with 920c8a1.

Weakness: CWE-328 (Use of Weak Hash)

## Which versions are affected by CVE-2024-54143?


## How do I fix CVE-2024-54143?

No fix has been published for CVE-2024-54143 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-54143 being exploited?

There is no known exploitation of CVE-2024-54143 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-54143 and fix it if it is affected.

What it is: CVE-2024-54143 is a critical command injection vulnerability in openwrt asu, published on 6 Dec 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-54143 in the wild and no public exploit code.

Affected product: openwrt asu. 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-2024-54143/ (Markdown: https://insights.sbomify.com/CVE-2024-54143/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-54143
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-54143
- OSV: https://osv.dev/vulnerability/CVE-2024-54143

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-54143/
Summaries are generated and may contain mistakes; the official description above is the record.