# CVE-2021-3485: Improper Input Validation in Bitdefender Endpoint Security Tools for Linux

> A man-in-the-middle attacker can achieve remote code execution by abusing the Product Update feature's improper input validation in Bitdefender Endpoint Security Tools for Linux.

- **Severity:** Medium 6.4 (`CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 May 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-wg6r-fv2h-h7xm

## What is CVE-2021-3485?

CVE-2021-3485 is a medium-severity code injection vulnerability in Bitdefender Endpoint Security Tools for Linux, published on 24 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An Improper Input Validation vulnerability in the Product Update feature of Bitdefender Endpoint Security Tools for Linux allows a man-in-the-middle attacker to abuse the DownloadFile function of the Product Update to achieve remote code execution. This issue affects: Bitdefender Endpoint Security Tools for Linux versions prior to 6.2.21.155.

Weakness: CWE-494 (Download of Code Without Integrity Check)

## Which versions are affected by CVE-2021-3485?

It affects 1 product.


Products: Bitdefender Endpoint Security Tools.

## How do I fix CVE-2021-3485?

No fix has been published for CVE-2021-3485 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-3485 being exploited?

There is no known exploitation of CVE-2021-3485 in the wild and no public exploit code.

## Other vulnerabilities in Bitdefender Endpoint Security Tools for Linux

- [CVE-2021-3554](https://insights.sbomify.com/CVE-2021-3554/): Improper Access Control vulnerability in the patchesUpdate API (critical 9.0)
- [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-2021-3552](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-2021-3485 and fix it if it is affected.

What it is: CVE-2021-3485 is a medium-severity code injection vulnerability in Bitdefender Endpoint Security Tools for Linux, published on 24 May 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-2021-3485 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-2021-3485/ (Markdown: https://insights.sbomify.com/CVE-2021-3485/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3485
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3485
- OSV: https://osv.dev/vulnerability/CVE-2021-3485

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-3485/
Summaries are generated and may contain mistakes; the official description above is the record.