PRIOn knowledge basePRION:CVE-2021-28957Cross site scripting
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. This issue is patched in lxml 4.6.3.
| CPE | Name | Operator | Version |
|---|---|---|---|
| debian_linux | eq | 9.0 | |
| debian_linux | eq | 10.0 | |
| fedora | eq | 33 | |
| fedora | eq | 34 | |
| lxml | lt | 4.6.3 | |
| zfs_storage_appliance_kit | eq | 8.8 |
References
bugs.launchpad.net/lxml/+bug/1888153
github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999
github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270
lists.debian.org/debian-lts-announce/2021/03/msg00031.html
lists.fedoraproject.org/archives/list/[email protected]/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45/
lists.fedoraproject.org/archives/list/[email protected]/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ/
security.gentoo.org/glsa/202208-06
security.netapp.com/advisory/ntap-20210521-0004/
www.debian.org/security/2021/dsa-4880
www.oracle.com/security-alerts/cpuoct2021.html
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