# CVE-2015-1356: Auth bypass in n/a

> Remote attackers can escalate privileges by modifying unprotected project files in Siemens SIMATIC STEP 7, bypassing authorization controls.

- **Severity:** Medium 4.4 (`AV:L/AC:M/Au:N/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 18 Feb 2015
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-pc45-5f4x-xp95

## What is CVE-2015-1356?

CVE-2015-1356 is a medium-severity authentication bypass vulnerability in n/a, published on 18 Feb 2015. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Siemens SIMATIC STEP 7 (TIA Portal) before 13 SP1 determines a user's privileges on the basis of project-file fields that lack integrity protection, which allows remote attackers to establish arbitrary authorization data via a modified file.

Weakness: CWE-264

## Which versions are affected by CVE-2015-1356?

It affects 1 product.


Products: Siemens Simatic Step 7.

## How do I fix CVE-2015-1356?

No fix has been published for CVE-2015-1356 yet. Limit exposure of the affected software until one is available.

## Is CVE-2015-1356 being exploited?

There is no known exploitation of CVE-2015-1356 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-42029](https://insights.sbomify.com/CVE-2021-42029/): Missing authorization in SIMATIC STEP 7 (TIA Portal) V15 (high 7.8)
- [CVE-2015-1601](https://insights.sbomify.com/CVE-2015-1601/): Other in n/a (medium 6.8)
- [CVE-2016-7959](https://insights.sbomify.com/CVE-2016-7959/): Information disclosure in n/a (medium 4.7)
- [CVE-2022-46141](https://insights.sbomify.com/CVE-2022-46141/): Information disclosure in SIMATIC STEP 7 (TIA Portal) (medium 4.2)
- [CVE-2016-7960](https://insights.sbomify.com/CVE-2016-7960/): Information disclosure in n/a (low 2.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-1356 and fix it if it is affected.

What it is: CVE-2015-1356 is a medium-severity authentication bypass vulnerability in n/a, published on 18 Feb 2015. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2015-1356 in the wild and no public exploit code.

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-2015-1356/ (Markdown: https://insights.sbomify.com/CVE-2015-1356/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-1356
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-1356
- OSV: https://osv.dev/vulnerability/CVE-2015-1356

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-1356/
Summaries are generated and may contain mistakes; the official description above is the record.