Vulnerability Description
The Upgrade-Insecure-Requests (UIR) specification states that if UIR is enabled through Content Security Policy (CSP), navigation to a same-origin URL must be upgraded to HTTPS. Firefox will incorrectly navigate to an HTTP URL rather than perform the security upgrade requested by the CSP in some circumstances, allowing for potential man-in-the-middle attacks on the linked resources. This vulnerability affects Firefox < 66.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 66.0 |
Related Weaknesses (CWE)
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1437009Issue TrackingVendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1515863Issue TrackingPermissions RequiredVendor Advisory
- https://w3c.github.io/webappsec-upgrade-insecure-requests/Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-07/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1437009Issue TrackingVendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1515863Issue TrackingPermissions RequiredVendor Advisory
- https://w3c.github.io/webappsec-upgrade-insecure-requests/Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-07/Vendor Advisory
FAQ
What is CVE-2019-9803?
CVE-2019-9803 is a vulnerability with a CVSS score of 7.4 (HIGH). The Upgrade-Insecure-Requests (UIR) specification states that if UIR is enabled through Content Security Policy (CSP), navigation to a same-origin URL must be upgraded to HTTPS. Firefox will incorrect...
How severe is CVE-2019-9803?
CVE-2019-9803 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-9803?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox.