---
title: "CVE-2019-3464\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2019-3464?format=md
keywords: index, follow
---

# CVE-2019-3464

Publication date 6 February 2019

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**9.8 · Critical**

[Score breakdown](https://ubuntu.com/security/CVE-2019-3464?format=md#impact-score)

Toggle side navigation

## Description

Insufficient sanitization of environment variables passed to rsync can
bypass the restrictions imposed by rssh, a restricted shell that should
restrict users to perform only rsync operations, resulting in the execution
of arbitrary shell commands.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| rssh | 18.10 cosmic | Fixed 2.3.4-8ubuntu0.2 |
| 18.04 LTS bionic | Fixed 2.3.4-7ubuntu0.1 |
| 16.04 LTS xenial | Fixed 2.3.4-4+deb8u2ubuntu0.16.04.2 |
| 14.04 LTS trusty | Fixed 2.3.4-4+deb8u2ubuntu0.14.04.2 |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

9.8 · Critical

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | High |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 9.8 · Critical |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3464)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-3464)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-3464)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-3464)

### Related Ubuntu Security Notices (USN)

+ [USN-3946-1](https://usn.ubuntu.com/USN-3946-1)
+ rssh vulnerabilities
+ 11 April 2019

### Other references

* <https://tracker.debian.org/news/1026713/accepted-rssh-234-5deb9u2-source-amd64-into-stable-embargoed-stable/>
* <https://www.cve.org/CVERecord?id=CVE-2019-3464>