CVE-2019-9803

high

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.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1437009

https://bugzilla.mozilla.org/show_bug.cgi?id=1515863

https://w3c.github.io/webappsec-upgrade-insecure-requests/

https://www.mozilla.org/security/advisories/mfsa2019-07/

Details

Source: MITRE

Published: 2019-04-26

Updated: 2019-04-30

Type: CWE-346

Risk Information

CVSS v2

Base Score: 5.8

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N

Impact Score: 4.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3

Base Score: 7.4

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Impact Score: 5.2

Exploitability Score: 2.2

Severity: HIGH