CVE-2019-11736: Race Condition
First published: Tue Sep 03 2019(Updated: )
The Mozilla Maintenance Service does not guard against files being hardlinked to another file in the updates directory, allowing for the replacement of local files, including the Maintenance Service executable, which is run with privileged access. Additionally, there was a race condition during checks for junctions and symbolic links by the Maintenance Service, allowing for potential local file and directory manipulation to be undetected in some circumstances. This allows for potential privilege escalation by a user with unprivileged local access. <br>*Note: These attacks requires local system access and only affects Windows. Other operating systems are not affected.*. This vulnerability affects Firefox < 69 and Firefox ESR < 68.1.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Firefox ESR | <68.1 | 68.1 |
| Mozilla Firefox | <69.0 | |
| Mozilla Firefox ESR | <68.1.0 | |
| Microsoft Windows | ||
| <68.1 | 68.1 | |
| Mozilla Firefox | <69 | 69 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1551913
- https://bugzilla.mozilla.org/show_bug.cgi?id=1552206
- https://www.mozilla.org/en-US/security/advisories/mfsa2019-26/
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
- https://www.mozilla.org/security/advisories/mfsa2019-25/
- https://www.mozilla.org/security/advisories/mfsa2019-26/
- https://www.mozilla.org/en-US/security/advisories/mfsa2019-26/#CVE-2019-11750
- https://www.mozilla.org/en-US/security/advisories/mfsa2019-25/
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is CVE-2019-11736?
CVE-2019-11736 is a vulnerability in the Mozilla Maintenance Service that allows for the replacement of local files, including the Maintenance Service executable.
How severe is CVE-2019-11736?
CVE-2019-11736 has a severity rating of 7, which is considered high.
What software is affected by CVE-2019-11736?
The Mozilla Firefox ESR versions up to and excluding 68.1, and the Mozilla Firefox versions up to and excluding 69 are affected by CVE-2019-11736.
How do I fix CVE-2019-11736?
Update your Mozilla Firefox ESR to version 68.1 or later, or update your Mozilla Firefox to version 69 or later.
Where can I find more information about CVE-2019-11736?
You can find more information about CVE-2019-11736 on the Mozilla Bugzilla website and the Mozilla Security Advisories website.
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