# CVE-2021-33526: Privilege escalation in mbDIALUP <= 3.9R0.0

> A local attacker can escalate privileges to SYSTEM by sending a malicious command to the mbDIALUP service, leading to arbitrary code execution.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Aug 2021
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-2992-6547-hhfp

## What is CVE-2021-33526?

CVE-2021-33526 is a high-severity vulnerability in mbDIALUP, published on 2 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In MB connect line mbDIALUP versions <= 3.9R0.0 a low privileged local attacker can send a command to the service running with NT AUTHORITY\SYSTEM instructing it to execute a malicous OpenVPN configuration resulting in arbitrary code execution with the privileges of the service.

Weakness: CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2021-33526?

It affects 1 product.


Products: Mbconnectline Mbdialup.

## How do I fix CVE-2021-33526?

No fix has been published for CVE-2021-33526 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33526 being exploited?

There is no known exploitation of CVE-2021-33526 in the wild and no public exploit code.

## Other vulnerabilities in mbDIALUP

- [CVE-2021-33527](https://insights.sbomify.com/CVE-2021-33527/): OS Command Injection in mbDIALUP <= 3.9R0.0 (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33526 and fix it if it is affected.

What it is: CVE-2021-33526 is a high-severity vulnerability in mbDIALUP, published on 2 Aug 2021. 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-2021-33526 in the wild and no public exploit code.

Affected product: mbDIALUP. 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-2021-33526/ (Markdown: https://insights.sbomify.com/CVE-2021-33526/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33526
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33526
- OSV: https://osv.dev/vulnerability/CVE-2021-33526

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33526/
Summaries are generated and may contain mistakes; the official description above is the record.