# CVE-2021-43034: Privilege escalation in n/a

> Local attackers can escalate privileges to the apache user and execute arbitrary code due to a world-writable file in Kaseya Unitrends Backup Appliance.

- **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:** 6 Dec 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-qh43-qjmr-4h4q

## What is CVE-2021-43034?

CVE-2021-43034 is a high-severity vulnerability in n/a, published on 6 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. A world writable file allowed local users to execute arbitrary code as the user apache, leading to privilege escalation.

Weakness: CWE-732 (Incorrect Permission Assignment for Critical Resource)

## Which versions are affected by CVE-2021-43034?

It affects 1 product.


Products: Kaseya Unitrends Backup.

## How do I fix CVE-2021-43034?

No fix has been published for CVE-2021-43034 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-43034 being exploited?

There is no known exploitation of CVE-2021-43034 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-40386](https://insights.sbomify.com/CVE-2021-40386/): Code injection in n/a (critical 9.8)
- [CVE-2021-43033](https://insights.sbomify.com/CVE-2021-43033/): Command injection in n/a (critical 9.8)
- [CVE-2021-43035](https://insights.sbomify.com/CVE-2021-43035/): SQL injection in n/a (critical 9.8)
- [CVE-2021-43036](https://insights.sbomify.com/CVE-2021-43036/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2021-43042](https://insights.sbomify.com/CVE-2021-43042/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-43034 and fix it if it is affected.

What it is: CVE-2021-43034 is a high-severity vulnerability in n/a, published on 6 Dec 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-2021-43034 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-2021-43034/ (Markdown: https://insights.sbomify.com/CVE-2021-43034/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-43034
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-43034
- OSV: https://osv.dev/vulnerability/CVE-2021-43034

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-43034/
Summaries are generated and may contain mistakes; the official description above is the record.