CVE-2020-6817

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']}).

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1623633	Exploit Issue Tracking
https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm	Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1623633	Exploit Issue Tracking
https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:mozilla:bleach:*:*:*:*:*:*:*:*

History

21 Nov 2024, 05:36

Type	Values Removed	Values Added
References	~~() https://bugzilla.mozilla.org/show_bug.cgi?id=1623633 - Exploit, Issue Tracking~~	() https://bugzilla.mozilla.org/show_bug.cgi?id=1623633 - Exploit, Issue Tracking
References	~~() https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm - Vendor Advisory~~	() https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm - Vendor Advisory
Summary		(es) Los atributos de estilo de análisis del comportamiento de bleach.clean podrían dar como resultado una denegación de servicio de expresión regular (ReDoS). Las llamadas a blanqueador.clean con una etiqueta permitida con un atributo de estilo permitido son vulnerables a ReDoS. Por ejemplo, blanqueador.clean(..., atributos={'a': ['estilo']}).

28 Feb 2023, 14:46

Type	Values Removed	Values Added
References	~~(MISC) https://bugzilla.mozilla.org/show_bug.cgi?id=1623633 -~~	(MISC) https://bugzilla.mozilla.org/show_bug.cgi?id=1623633 - Exploit, Issue Tracking
References	~~(MISC) https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm -~~	(MISC) https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm - Vendor Advisory
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5
CWE		CWE-1333
CPE		cpe:2.3:a:mozilla:bleach::::::::

17 Feb 2023, 12:52

Type	Values Removed	Values Added
New CVE

Information

Published : 2023-02-16 22:15

Updated : 2025-03-19 16:15

NVD link : CVE-2020-6817

Mitre link : CVE-2020-6817

CVE.ORG link : CVE-2020-6817

JSON object : View

Products Affected

mozilla

bleach

CWE

CWE-1333

Inefficient Regular Expression Complexity

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7.5 /10