MGASA-2021-0246 - Updated python-lxml packages fix a security vulnerability Publication date: 13 Jun 2021 URL: https://advisories.mageia.org/MGASA-2021-0246.html Type: security Affected Mageia releases: 7, 8 CVE: CVE-2021-28957 An XSS vulnerability was discovered in python-lxml’s clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML (CVE-2021-28957). References: - https://bugs.mageia.org/show_bug.cgi?id=28983 - https://lists.fedoraproject.org/archives/list/[email protected]/thread/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45/ - https://www.debian.org/security/2021/dsa-4880 - https://ubuntu.com/security/notices/USN-4896-1 - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28957 SRPMS: - 8/core/python-lxml-4.6.3-1.mga8 - 7/core/python-lxml-4.3.0-1.3.mga7
Mageia 2021-0246: python-lxml security update
An XSS vulnerability was discovered in python-lxml’s clean module versions before 4.6.3
Summary
An XSS vulnerability was discovered in python-lxml’s clean module
versions before 4.6.3. When disabling the safe_attrs_only and forms
arguments, the Cleaner class does not remove the formaction attribute
allowing for JS to bypass the sanitizer. A remote attacker could exploit this
flaw to run arbitrary JS code on users who interact with incorrectly
sanitized HTML (CVE-2021-28957).
References
- https://bugs.mageia.org/show_bug.cgi?id=28983
- https://lists.fedoraproject.org/archives/list/[email protected]/thread/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45/
- https://www.debian.org/security/2021/dsa-4880
- https://ubuntu.com/security/notices/USN-4896-1
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28957
Resolution
MGASA-2021-0246 - Updated python-lxml packages fix a security vulnerability
SRPMS
- 8/core/python-lxml-4.6.3-1.mga8
- 7/core/python-lxml-4.3.0-1.3.mga7
Severity
Publication date: 13 Jun 2021
URL: https://advisories.mageia.org/MGASA-2021-0246.html
Type: security
CVE: CVE-2021-28957
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