# CVE-2024-43099: AutomationDirect DirectLogic H2-DM1E Authentication Bypass by Capture-replay

> An attacker can hijack authenticated sessions by capturing session keys and spoofing network addresses to inject traffic into PLC communications.

- **Severity:** High 8.7 (`CVSS:4.0/AV:A/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Sep 2024
- **Updated:** 13 Sep 2024
- **Also known as:** GHSA-xqww-5c9g-v62q

## What is CVE-2024-43099?

CVE-2024-43099 is a high-severity authentication bypass vulnerability in AutomationDirect DirectLogic H2-DM1E, published on 13 Sep 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The session hijacking attack targets the application layer's control mechanism, which manages authenticated sessions between a host PC and a PLC. During such sessions, a session key is utilized to maintain security. However, if an attacker captures this session key, they can inject traffic into an ongoing authenticated session. To successfully achieve this, the attacker also needs to spoof both the IP address and MAC address of the originating host which is typical of a session-based attack.

Weakness: CWE-294 (Authentication Bypass by Capture-replay)

## Which versions are affected by CVE-2024-43099?


## How do I fix CVE-2024-43099?

No fix has been published for CVE-2024-43099 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-43099 being exploited?

There is no known exploitation of CVE-2024-43099 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-43099 and fix it if it is affected.

What it is: CVE-2024-43099 is a high-severity authentication bypass vulnerability in AutomationDirect DirectLogic H2-DM1E, published on 13 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-2024-43099 in the wild and no public exploit code.

Affected product: AutomationDirect DirectLogic H2-DM1E. 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-2024-43099/ (Markdown: https://insights.sbomify.com/CVE-2024-43099/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-43099
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-43099
- OSV: https://osv.dev/vulnerability/CVE-2024-43099

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From sbomify Insights: https://insights.sbomify.com/CVE-2024-43099/
Summaries are generated and may contain mistakes; the official description above is the record.