CVE-2020-6817

Summary

bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS). Calls to bleach.clean with an allowed tag with an allowed style attribute are vulnerable to ReDoS. For example, bleach.clean(…, attributes={'a': ['style']}).

Affected Software

Weaknesses

• regular expression denial-of-service (ReDoS) in BleachSanitizerFilter.sanitize_css gauntlet regular expression

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm
• https://bugzilla.mozilla.org/show_bug.cgi?id=1623633

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

References

• https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm
• https://bugzilla.mozilla.org/show_bug.cgi?id=1623633

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