CVE-2017-7840: XSS
First published: Tue Nov 14 2017(Updated: )
JavaScript can be injected into an exported bookmarks file by placing JavaScript code into user-supplied tags in saved bookmarks. If the resulting exported HTML file is later opened in a browser this JavaScript will be executed. This could be used in social engineering and self-cross-site-scripting (self-XSS) attacks if users were convinced to add malicious tags to bookmarks, export them, and then open the resulting file.
Credit: security@mozilla.org security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Firefox | <57 | 57 |
| Mozilla Firefox | <=56.0.2 | |
| debian/firefox | 131.0.2-2 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1366420
- https://www.mozilla.org/security/advisories/mfsa2017-24/
- http://www.securityfocus.com/bid/101832
- http://www.securitytracker.com/id/1039803
- https://launchpad.net/bugs/cve/CVE-2017-7840
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-24/
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-24/#CVE-2017-7840
- https://security-tracker.debian.org/tracker/CVE-2017-7840
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7840
- https://nvd.nist.gov/vuln/detail/CVE-2017-7840
- https://ubuntu.com/security/CVE-2017-7840
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is CVE-2017-7840?
CVE-2017-7840 is a vulnerability that allows JavaScript code to be injected into an exported bookmarks file.
How does CVE-2017-7840 work?
CVE-2017-7840 works by placing JavaScript code into user-supplied tags in saved bookmarks, which is then executed when the exported HTML file is opened in a browser.
Which software is affected by CVE-2017-7840?
Mozilla Firefox versions up to 57.0.1 and Ubuntu Firefox versions up to 57.0+ are affected by CVE-2017-7840.
What is the severity of CVE-2017-7840?
CVE-2017-7840 has a severity rating of 6.1 (medium).
How can I fix CVE-2017-7840?
To fix CVE-2017-7840, it is recommended to update Mozilla Firefox to version 57.0.2 or later, or update Ubuntu Firefox to version 57.0.2 or later.
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