A python-bleach security update has been released for SUSE Linux Enterprise 15 SP2.

openSUSE-SU-2021:0571-1: important: Security update for python-bleach

openSUSE Security Update: Security update for python-bleach
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Announcement ID: openSUSE-SU-2021:0571-1
Rating: important
References: #1167379 #1168280 #1184547
Cross-References: CVE-2020-6816 CVE-2020-6817 CVE-2021-23980

CVSS scores:
CVE-2020-6816 (NVD) : 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVE-2021-23980 (SUSE): 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected Products:
openSUSE Backports SLE-15-SP2
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An update that fixes three vulnerabilities is now available.

Description:

This update for python-bleach fixes the following issues:

- CVE-2021-23980: Fixed mutation XSS on bleach.clean with specific
combinations of allowed tags (boo#1184547)

Update to 3.1.5:

* replace missing ``setuptools`` dependency with ``packaging``. Thank you
Benjamin Peterson.

Update to 3.1.4 (boo#1168280, 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 were vulnerable
to ReDoS. For example, ``bleach.clean(..., attributes={'a':
['style']})``.
* Style attributes with dashes, or single or double quoted values are
cleaned instead of passed through.

update to 3.1.3 (boo#1167379, CVE-2020-6816):

* Add relative link to code of conduct. (#442)
* Drop deprecated 'setup.py test' support. (#507)
* Fix typo: curren -> current in tests/test_clean.py (#504)
* Test on PyPy 7
* Drop test support for end of life Python 3.4
* ``bleach.clean`` behavior parsing embedded MathML and SVG content with
RCDATA tags did not match browser behavior and could result in a
mutation XSS. Calls to ``bleach.clean`` with ``strip=False`` and
``math`` or ``svg`` tags and one or more of the RCDATA tags ``script``,
``noscript``, ``style``, ``noframes``, ``iframe``, ``noembed``, or
``xmp`` in the allowed tags whitelist were vulnerable to a mutation XSS.

This update was imported from the openSUSE:Leap:15.2:Update update project.

Patch Instructions:

To install this openSUSE Security Update use the SUSE recommended installation methods
like YaST online_update or "zypper patch".

Alternatively you can run the command listed for your product:

- openSUSE Backports SLE-15-SP2:

zypper in -t patch openSUSE-2021-571=1


Package List:

- openSUSE Backports SLE-15-SP2 (noarch):

python2-bleach-3.1.5-bp152.2.4.1
python3-bleach-3.1.5-bp152.2.4.1

References:

  https://www.suse.com/security/cve/CVE-2020-6816.html
  https://www.suse.com/security/cve/CVE-2020-6817.html
  https://www.suse.com/security/cve/CVE-2021-23980.html
  https://bugzilla.suse.com/1167379
  https://bugzilla.suse.com/1168280
  https://bugzilla.suse.com/1184547