# CVE-2021-3554: Improper Access Control vulnerability in the patchesUpdate API

> An attacker can manipulate the remote address for pulling patches in Bitdefender Endpoint Security Tools for Linux due to improper access control.

- **Severity:** Critical 9.0 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Nov 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-6wjr-cr9m-279q

## What is CVE-2021-3554?

CVE-2021-3554 is a critical missing authorization vulnerability in Bitdefender Endpoint Security Tools for Linux, published on 24 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper Access Control vulnerability in the patchesUpdate API as implemented in Bitdefender Endpoint Security Tools for Linux as a relay role allows an attacker to manipulate the remote address used for pulling patches. This issue affects: Bitdefender Endpoint Security Tools for Linux versions prior to 6.6.27.390; versions prior to 7.1.2.33. Bitdefender Unified Endpoint versions prior to 6.2.21.160. Bitdefender GravityZone versions prior to 6.24.1-1.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2021-3554?

It affects 2 products.


Products: Bitdefender Endpoint Security Tools, Bitdefender Gravityzone.

## How do I fix CVE-2021-3554?

No fix has been published for CVE-2021-3554 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-3554 being exploited?

There is no known exploitation of CVE-2021-3554 in the wild and no public exploit code.

## Other vulnerabilities in Bitdefender Endpoint Security Tools for Linux

- [CVE-2021-3576](https://insights.sbomify.com/CVE-2021-3576/): Privilege escalation via SeImpersonatePrivilege (high 7.8)
- [CVE-2021-3579](https://insights.sbomify.com/CVE-2021-3579/): Incorrect Default Permissions vulnerability in bdservicehost.exe and Vulnerability.Scan.exe (high 7.8)
- [CVE-2022-0677](https://insights.sbomify.com/CVE-2022-0677/): Improper Handling of Length Parameter Inconsistency vulnerability in Bitdefender Update Server (VA-10144) (high 7.5)
- [CVE-2021-3485](https://insights.sbomify.com/CVE-2021-3485/): Improper Input Validation in Bitdefender Endpoint Security Tools for Linux (medium 6.4)
- [CVE-2021-3552](https://insights.sbomify.com/CVE-2021-3552/): Insufficient validation on regular expression in EPPUpdateService config file (VA-9825) (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-3554 and fix it if it is affected.

What it is: CVE-2021-3554 is a critical missing authorization vulnerability in Bitdefender Endpoint Security Tools for Linux, published on 24 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-3554 in the wild and no public exploit code.

Affected product: Bitdefender Endpoint Security Tools for Linux. 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-2021-3554/ (Markdown: https://insights.sbomify.com/CVE-2021-3554/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3554
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3554
- OSV: https://osv.dev/vulnerability/CVE-2021-3554

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-3554/
Summaries are generated and may contain mistakes; the official description above is the record.