# CVE-2019-3999: Command injection in Druva inSync Windows Client

> A local attacker can execute arbitrary OS commands with SYSTEM privileges via improper neutralization in the Druva inSync Windows Client.

- **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:** 25 Feb 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-xm72-wm3m-qgm7

## What is CVE-2019-3999?

CVE-2019-3999 is a high-severity command injection vulnerability in Druva inSync Windows Client, published on 25 Feb 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Improper neutralization of special elements used in an OS command in Druva inSync Windows Client 6.5.0 allows a local, unauthenticated attacker to execute arbitrary operating system commands with SYSTEM privileges.

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

## Which versions are affected by CVE-2019-3999?

It affects 1 product.


Products: Druva Insync Client.

## How do I fix CVE-2019-3999?

No fix has been published for CVE-2019-3999 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-3999 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-3999 exists.

Public exploit code:

- Druva inSync inSyncCPHwnet64.exe RPC Type 5 Privilege Escalation (metasploit)
- Druva inSync Windows Client 6.5.2 - Local Privilege Escalation (exploitdb)

## Other vulnerabilities in Druva inSync Windows Client

- [CVE-2021-36665](https://insights.sbomify.com/CVE-2021-36665/): Deserialization in n/a (high 7.8)
- [CVE-2021-36666](https://insights.sbomify.com/CVE-2021-36666/): Privilege escalation in n/a (high 7.8)
- [CVE-2021-36667](https://insights.sbomify.com/CVE-2021-36667/): Command injection in n/a (high 7.8)
- [CVE-2021-36668](https://insights.sbomify.com/CVE-2021-36668/): Open redirect in n/a (high 7.8)
- [CVE-2020-5752](https://insights.sbomify.com/CVE-2020-5752/): Path traversal in Druva inSync Windows Client (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-3999 and fix it if it is affected.

What it is: CVE-2019-3999 is a high-severity command injection vulnerability in Druva inSync Windows Client, published on 25 Feb 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-3999 exists.

Affected product: Druva inSync Windows Client. 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-2019-3999/ (Markdown: https://insights.sbomify.com/CVE-2019-3999/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-3999
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-3999
- OSV: https://osv.dev/vulnerability/CVE-2019-3999

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-3999/
Summaries are generated and may contain mistakes; the official description above is the record.