Bug 1829345 (CVE-2020-6813)

Summary: CVE-2020-6813 Mozilla: @import statements in CSS could bypass the Content Security Policy nonce feature
Product: [Other] Security Response Reporter: msiddiqu
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: jhorak, security-response-team, stransky
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: firefox 74 Doc Type: If docs needed, set a value
Doc Text:
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Clone Of: Environment:
Last Closed: 2020-04-29 16:32:09 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On:    
Bug Blocks: 1829324    

Description msiddiqu 2020-04-29 12:18:31 UTC
When protecting CSS blocks with the nonce feature of Content Security Policy, the @import statement in the CSS block could allow an attacker to inject arbitrary styles, bypassing the intent of the Content Security Policy.



External Reference:

https://www.mozilla.org/en-US/security/advisories/mfsa2020-08/#CVE-2020-6813

Comment 1 msiddiqu 2020-04-29 12:18:35 UTC
Acknowledgments:

Name: the Mozilla project
Upstream: Matheus Vrech

Comment 2 Product Security DevOps Team 2020-04-29 16:32:09 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-6813