---
title: "CVE-2016-0763\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-2016-0763?format=md
keywords: index, follow
---

# CVE-2016-0763

Publication date 24 February 2016

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**6.3 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2016-0763?format=md#impact-score)

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## Description

The setGlobalContext method in
org/apache/naming/factory/ResourceLinkFactory.java in Apache Tomcat 7.x
before 7.0.68, 8.x before 8.0.31, and 9.x before 9.0.0.M3 does not consider
whether ResourceLinkFactory.setGlobalContext callers are authorized, which
allows remote authenticated users to bypass intended SecurityManager
restrictions and read or write to arbitrary application data, or cause a
denial of service (application disruption), via a web application that sets
a crafted global context.

### From the Ubuntu Security Team

It was discovered that the Tomcat setGlobalContext method incorrectly
checked if callers were authorized. A remote attacker could possibly use
this issue to read or wite to arbitrary application data, or cause a denial
of service.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| tomcat6 | 18.04 LTS bionic | Not in release |
| 17.10 artful | Not in release |
| 17.04 zesty | Not in release |
| 16.10 yakkety | Not in release |
| 16.04 LTS xenial | Fixed 6.0.45+dfsg-1 |
| 15.10 wily | Ignored end of life |
| 14.04 LTS trusty | Fixed 6.0.39-1ubuntu0.1 |
| 12.04 LTS precise | Fixed 6.0.35-1ubuntu3.7 |
| tomcat7 | 18.04 LTS bionic | Not affected |
| 17.10 artful | Not affected |
| 17.04 zesty | Not affected |
| 16.10 yakkety | Not affected |
| 16.04 LTS xenial | Not affected |
| 15.10 wily | Fixed 7.0.64-1ubuntu0.3 |
| 14.04 LTS trusty | Fixed 7.0.52-1ubuntu0.6 |
| 12.04 LTS precise | Ignored end of life |
| tomcat8 | 18.04 LTS bionic | Not affected |
| 17.10 artful | Not affected |
| 17.04 zesty | Not affected |
| 16.10 yakkety | Not affected |
| 16.04 LTS xenial | Not affected |
| 15.10 wily | Ignored end of life |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2016-0763?format=md#patch-details)

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| tomcat6 | * Upstream:   <http://svn.apache.org/viewvc?view=revision&revision=1726003> |
| tomcat7 | * Upstream:   <http://svn.apache.org/viewvc?view=revision&revision=1725931> |
| tomcat8 | * Upstream:   <http://svn.apache.org/viewvc?view=revision&revision=1725929> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.3 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.3 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0763)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-0763)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-0763)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-0763)

### Related Ubuntu Security Notices (USN)

+ [USN-3024-1](https://usn.ubuntu.com/USN-3024-1)
+ Tomcat vulnerabilities
+ 5 July 2016

### Other references

* <http://seclists.org/bugtraq/2016/Feb/147>
* <https://www.cve.org/CVERecord?id=CVE-2016-0763>