# CVE-2021-36781: parsec: dangerous 777 permissions for /run/parsec

> Local attackers can exploit insecure default permissions to impersonate the parsec service, causing denial of service or client hijacking.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Jan 2022
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-m398-vv9j-2r7f, openSUSE-SU-2024:11665-1

## What is CVE-2021-36781?

CVE-2021-36781 is a medium-severity vulnerability in openSUSE Factory, published on 14 Jan 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A Incorrect Default Permissions vulnerability in the parsec package of openSUSE Factory allows local attackers to imitate the service leading to DoS or clients talking to an imposter service. This issue affects: openSUSE Factory parsec versions prior to 0.8.1-1.1.

Weakness: CWE-276 (Incorrect Default Permissions)

## Which versions are affected by CVE-2021-36781?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `parsec` | openSUSE:Tumbleweed | All versions | 0.8.0-3.1 |

Products: Opensuse Factory.

## How do I fix CVE-2021-36781?

Upgrade to a fixed version.

## Is CVE-2021-36781 being exploited?

There is no known exploitation of CVE-2021-36781 in the wild and no public exploit code.

## Other vulnerabilities in openSUSE Factory

- [CVE-2021-25319](https://insights.sbomify.com/CVE-2021-25319/): virtualbox: missing sticky bit for /etc/vbox allows local root exploit for members of vboxusers group (high 7.8)
- [CVE-2022-31256](https://insights.sbomify.com/CVE-2022-31256/): sendmail: mail to root privilege escalation via sm-client.pre script (high 7.7)
- [CVE-2022-31251](https://insights.sbomify.com/CVE-2022-31251/): slurm: %post for slurm-testsuite operates as root in user owned directory (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-36781 and fix it if it is affected.

What it is: CVE-2021-36781 is a medium-severity vulnerability in openSUSE Factory, published on 14 Jan 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-2021-36781 in the wild and no public exploit code.

Affected product: openSUSE Factory. 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-2021-36781/ (Markdown: https://insights.sbomify.com/CVE-2021-36781/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-36781
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-36781
- OSV: https://osv.dev/vulnerability/CVE-2021-36781

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-36781/
Summaries are generated and may contain mistakes; the official description above is the record.