Описание
XSS in Bleach when noscript and raw tag whitelisted
Impact
A mutation XSS affects users calling bleach.clean with noscript and a raw tag (see below) in the allowed/whitelisted tags option.
Patches
v3.1.1
Workarounds
- modify
bleach.cleancalls to not whitelistnoscriptand one or more of the following raw tags:
- A strong Content-Security-Policy without
unsafe-inlineandunsafe-evalscript-srcs) will also help mitigate the risk.
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1615315
- https://cure53.de/fp170.pdf
- https://nvd.nist.gov/vuln/detail/CVE-2020-6802
- https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach
Credits
- Reported by Yaniv Nizry from the CxSCA AppSec group at Checkmarx
For more information
If you have any questions or comments about this advisory:
- Open an issue at https://github.com/mozilla/bleach/issues
- Email us at security@mozilla.org
Ссылки
- https://github.com/mozilla/bleach/security/advisories/GHSA-q65m-pv3f-wr5r
- https://nvd.nist.gov/vuln/detail/CVE-2020-6802
- https://github.com/mozilla/bleach/commit/f77e0f6392177a06e46a49abd61a4d9f035e57fd
- https://advisory.checkmarx.net/advisory/CX-2020-4276
- https://bugzilla.mozilla.org/show_bug.cgi?id=1615315
- https://cure53.de/fp170.pdf
- https://github.com/pypa/advisory-database/tree/main/vulns/bleach/PYSEC-2020-27.yaml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/72R4VFFHDRSQMNT7IZU3X2755ZP4HGNI
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OCNLM2MGQTOLCIVVYS2Z5S7KOQJR5JC4
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YTULPQB7HVPPYWEYVNHJGDTSPVIDHIZX
- https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach
Пакеты
bleach
< 3.1.1
3.1.1
Связанные уязвимости
In Mozilla Bleach before 3.11, a mutation XSS affects users calling bleach.clean with noscript and a raw tag in the allowed/whitelisted tags option.
In Mozilla Bleach before 3.11, a mutation XSS affects users calling bleach.clean with noscript and a raw tag in the allowed/whitelisted tags option.
In Mozilla Bleach before 3.11, a mutation XSS affects users calling bl ...
Уязвимость библиотеки очистки HTML Mozilla Bleach, существующая из-за непринятия мер по защите структуры веб-страницы, позволяющая нарушителю провести атаку межсайтового скриптинга (XSS)