CVE-2019-17016

Description

When pasting a &lt;style&gt; tag from the clipboard into a rich text editor, the CSS sanitizer incorrectly rewrites a @namespace rule. This could allow for injection into certain types of websites resulting in data exfiltration. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.

Category

6.1
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 2.17% Top 20%
Vendor Advisory debian.org Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory opensuse.org Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory debian.org Vendor Advisory opensuse.org Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory gentoo.org Vendor Advisory ubuntu.com Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: Mozilla Firefox ESR
Affected: Mozilla Firefox
Published at:
Updated at:

References

Link Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1599181 permissions required
https://www.mozilla.org/security/advisories/mfsa2020-01/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2020-02/ vendor advisory
https://seclists.org/bugtraq/2020/Jan/12 third party advisory mailing list
https://lists.debian.org/debian-lts-announce/2020/01/msg00005.html third party advisory mailing list
https://www.debian.org/security/2020/dsa-4600 third party advisory vendor advisory
https://usn.ubuntu.com/4234-1/ third party advisory vendor advisory
https://seclists.org/bugtraq/2020/Jan/18 third party advisory mailing list
https://access.redhat.com/errata/RHSA-2020:0085 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2020:0086 third party advisory vendor advisory
http://packetstormsecurity.com/files/155912/Slackware-Security-Advisory-mozilla-thunderbird-Updates.html
https://access.redhat.com/errata/RHSA-2020:0111 vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00029.html vendor advisory
https://access.redhat.com/errata/RHSA-2020:0120 vendor advisory
https://access.redhat.com/errata/RHSA-2020:0123 vendor advisory
https://access.redhat.com/errata/RHSA-2020:0127 vendor advisory
https://usn.ubuntu.com/4241-1/ vendor advisory
https://www.debian.org/security/2020/dsa-4603 vendor advisory
https://seclists.org/bugtraq/2020/Jan/26 mailing list
https://lists.debian.org/debian-lts-announce/2020/01/msg00016.html mailing list
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00043.html vendor advisory
https://access.redhat.com/errata/RHSA-2020:0292 vendor advisory
https://access.redhat.com/errata/RHSA-2020:0295 vendor advisory
https://security.gentoo.org/glsa/202003-02 vendor advisory
https://usn.ubuntu.com/4335-1/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2019-17016?
CVE-2019-17016 has been scored as a medium severity vulnerability.
How to fix CVE-2019-17016?
To fix CVE-2019-17016, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-17016 being actively exploited in the wild?
It is possible that CVE-2019-17016 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2019-17016?
CVE-2019-17016 affects Mozilla Firefox ESR, Mozilla Firefox.
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