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CVE-2019-17022

MEDIUMCVSS 6.1/10EPSS 1.99%

Last modified

CVE-2019-17022 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. When pasting a <style> tag from the clipboard into a rich text editor, the CSS sanitizer does not escape < and > characters. Because the resulting string is pasted directly into the text node of the element this does not result in a direct injection into the webpage; however, if a webpage subsequently copies the node's innerHTML, assigning it to another innerHTML, this would result in an XSS vulnerability. EPSS estimates a 1.99% chance of exploitation in the next 30 days.

Description

When pasting a &lt;style&gt; tag from the clipboard into a rich text editor, the CSS sanitizer does not escape &lt; and &gt; characters. Because the resulting string is pasted directly into the text node of the element this does not result in a direct injection into the webpage; however, if a webpage subsequently copies the node's innerHTML, assigning it to another innerHTML, this would result in an XSS vulnerability. Two WYSIWYG editors were identified with this behavior, more may exist. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.

Metrics

CVSS 3.1
6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability
1.99%

78.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
MozillaFirefox< 72.0
MozillaFirefox Esr< 68.4
CanonicalUbuntu Linux16.04
CanonicalUbuntu Linux18.04
CanonicalUbuntu Linux19.04
CanonicalUbuntu Linux19.10
DebianDebian Linux8.0
DebianDebian Linux9.0
DebianDebian Linux10.0
RedhatEnterprise Linux Desktop6.0
RedhatEnterprise Linux Desktop7.0
RedhatEnterprise Linux Server6.0
RedhatEnterprise Linux Server7.0
RedhatEnterprise Linux Server Aus7.7
RedhatEnterprise Linux Server Tus7.7
RedhatEnterprise Linux Workstation6.0
RedhatEnterprise Linux Workstation7.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2019-17022?
When pasting a &lt;style&gt; tag from the clipboard into a rich text editor, the CSS sanitizer does not escape &lt; and &gt; characters. Because the resulting string is pasted directly into the text node of the element this does not result in a direct injection into the webpage; however, if a webpage subsequently copies the node's innerHTML, assigning it to another innerHTML, this would result in an XSS vulnerability. Two WYSIWYG editors were identified with this behavior, more may exist. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.
How severe is CVE-2019-17022?
CVE-2019-17022 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.99% probability of exploitation in the next 30 days.
How do I fix CVE-2019-17022?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-17022?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST