---
title: "CVE-2015-6728\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-2015-6728?format=md
keywords: index, follow
---

# CVE-2015-6728

Publication date 1 September 2015

Last updated 24 July 2024

---

Ubuntu priority

**Medium**

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

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## Description

The ApiBase::getWatchlistUser function in MediaWiki before 1.23.10, 1.24.x
before 1.24.3, and 1.25.x before 1.25.2 does not perform token comparison
in constant time, which allows remote attackers to guess the watchlist
token and bypass CSRF protection via a timing attack.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| mediawiki | 19.04 disco | Not affected |
| 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Not affected |
| 17.10 artful | Ignored end of life |
| 17.04 zesty | Ignored end of life |
| 16.10 yakkety | Ignored end of life |
| 16.04 LTS xenial | Not in release |
| 15.10 wily | Ignored end of life |
| 15.04 vivid | Ignored end of life |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Ignored end of life |

---

* [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-2015-6728?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 |
| --- | --- |
| mediawiki | * Other:   <https://phab.wmfusercontent.org/file/data/vgmrdfcfkdbeic4v5ryi/PHID-FILE-7pogvobk22uckzhfbfz3/in4igal2pmhgr5rm/0001-SECURITY-API-Use-constant-time-comparison-for-watchl.patch> |

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6728)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-6728)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-6728)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2015-6728)

### Other references

* <https://phabricator.wikimedia.org/T94116>
* <http://www.openwall.com/lists/oss-security/2015/08/27>
* <https://www.cve.org/CVERecord?id=CVE-2015-6728>