# CVE-2021-42255: Privilege escalation in n/a

> Local attackers can gain SYSTEM privileges by exploiting insecure temporary file permissions during repair operations in AppGuard Enterprise.

- **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:** 12 Apr 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-pxfj-vmhh-m9gm

## What is CVE-2021-42255?

CVE-2021-42255 is a high-severity vulnerability in n/a, published on 12 Apr 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

AppGuard Enterprise before 6.7.100.1 creates a Temporary File in a Directory with Insecure Permissions. Local users can gain SYSTEM privileges because a repair operation relies on the %TEMP% directory of an unprivileged user.

Weakness: CWE-668 (Exposure of Resource to Wrong Sphere)

## Which versions are affected by CVE-2021-42255?

It affects 1 product.


Products: Blueplanet-Works Appguard.

## How do I fix CVE-2021-42255?

No fix has been published for CVE-2021-42255 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-42255 being exploited?

There is no known exploitation of CVE-2021-42255 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-42255 and fix it if it is affected.

What it is: CVE-2021-42255 is a high-severity vulnerability in n/a, published on 12 Apr 2022. 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-2021-42255 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-2021-42255/ (Markdown: https://insights.sbomify.com/CVE-2021-42255/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-42255
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-42255
- OSV: https://osv.dev/vulnerability/CVE-2021-42255

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-42255/
Summaries are generated and may contain mistakes; the official description above is the record.