Vulnerability Description
The "instanceof" operator can bypass the Xray wrapper mechanism. When called on web content from the browser itself or an extension the web content can provide its own result for that operator, possibly tricking the browser or extension into mishandling the element. This vulnerability affects Firefox < 56.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | <= 55.0.3 |
References
- http://www.securityfocus.com/bid/101057Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039465Third Party AdvisoryVDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1378207ExploitIssue Tracking
- https://www.mozilla.org/security/advisories/mfsa2017-21/Vendor Advisory
- http://www.securityfocus.com/bid/101057Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039465Third Party AdvisoryVDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1378207ExploitIssue Tracking
- https://www.mozilla.org/security/advisories/mfsa2017-21/Vendor Advisory
FAQ
What is CVE-2017-7820?
CVE-2017-7820 is a vulnerability with a CVSS score of 5.3 (MEDIUM). The "instanceof" operator can bypass the Xray wrapper mechanism. When called on web content from the browser itself or an extension the web content can provide its own result for that operator, possib...
How severe is CVE-2017-7820?
CVE-2017-7820 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-7820?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox.