# CVE-2019-6739: Command injection in Antimalware

> Remote attackers can execute arbitrary code by tricking users into visiting malicious web pages due to unsanitized URI handling.

- **Severity:** High 8.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 3 Jun 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-25x3-vv3q-35jw

## What is CVE-2019-6739?

CVE-2019-6739 is a high-severity command injection vulnerability in Malwarebytes Antimalware, published on 3 Jun 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Malwarebytes Antimalware 3.6.1.2711. User interaction is required to exploit this vulnerability in that the target must visit a malicious web page. There is an issue with the way the product handles URIs within certain schemes. The product does not warn the user that a dangerous navigation is about to take place. Because special characters in the URI are not sanitized, this could lead to the execution of arbitrary commands. An attacker can leverage this vulnerability to execute code in the context of the current user at medium integrity. Was ZDI-CAN-7162.

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command), CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2019-6739?

It affects 1 product.


Products: Malwarebytes Antimalware.

## How do I fix CVE-2019-6739?

No fix has been published for CVE-2019-6739 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-6739 being exploited?

There is no known exploitation of CVE-2019-6739 in the wild and no public exploit code.

## Other vulnerabilities in Malwarebytes Antimalware

- [CVE-2024-6260](https://insights.sbomify.com/CVE-2024-6260/): Malwarebytes Antimalware Link Following Local Privilege Escalation Vulnerability (high 7.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-6739 and fix it if it is affected.

What it is: CVE-2019-6739 is a high-severity command injection vulnerability in Malwarebytes Antimalware, published on 3 Jun 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-6739 in the wild and no public exploit code.

Affected product: Malwarebytes Antimalware. 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-2019-6739/ (Markdown: https://insights.sbomify.com/CVE-2019-6739/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6739
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6739
- OSV: https://osv.dev/vulnerability/CVE-2019-6739

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-6739/
Summaries are generated and may contain mistakes; the official description above is the record.