# CVE-2022-43398: Auth bypass in POWER METER SICAM Q100

> Attackers can hijack user sessions by overwriting session cookies on Siemens SICAM Q100 power meters, leading to unauthorized account access.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 8 Nov 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-fph2-95mp-m2fq

## What is CVE-2022-43398?

CVE-2022-43398 is a high-severity authentication bypass vulnerability in Siemens POWER METER SICAM Q100, published on 8 Nov 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A vulnerability has been identified in POWER METER SICAM Q100 (All versions < V2.50), POWER METER SICAM Q100 (All versions < V2.50), POWER METER SICAM Q100 (All versions < V2.50), POWER METER SICAM Q100 (All versions < V2.50). Affected devices do not renew the session cookie after login/logout and also accept user defined session cookies.  An attacker could overwrite the stored session cookie of a user. After the victim logged in, the attacker is given access to the user's account through the activated session.

Weakness: CWE-384 (Session Fixation)

## Which versions are affected by CVE-2022-43398?

It affects 2 products.


Products: Siemens 7kg9501-0aa01-2aa1 Firmware, Siemens 7kg9501-0aa31-2aa1 Firmware.

## How do I fix CVE-2022-43398?

No fix has been published for CVE-2022-43398 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-43398 being exploited?

There is no known exploitation of CVE-2022-43398 in the wild and no public exploit code.

## Other vulnerabilities in Siemens POWER METER SICAM Q100

- [CVE-2022-43439](https://insights.sbomify.com/CVE-2022-43439/): Other in POWER METER SICAM Q100 (critical 9.9)
- [CVE-2022-43545](https://insights.sbomify.com/CVE-2022-43545/): Code injection in POWER METER SICAM Q100 (critical 9.9)
- [CVE-2022-43546](https://insights.sbomify.com/CVE-2022-43546/): Other in POWER METER SICAM Q100 (critical 9.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-43398 and fix it if it is affected.

What it is: CVE-2022-43398 is a high-severity authentication bypass vulnerability in Siemens POWER METER SICAM Q100, published on 8 Nov 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2022-43398 in the wild and no public exploit code.

Affected product: Siemens POWER METER SICAM Q100. 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-2022-43398/ (Markdown: https://insights.sbomify.com/CVE-2022-43398/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-43398
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-43398
- OSV: https://osv.dev/vulnerability/CVE-2022-43398

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From sbomify Insights: https://insights.sbomify.com/CVE-2022-43398/
Summaries are generated and may contain mistakes; the official description above is the record.