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AUSCERT External Security Bulletin Redistribution
ESB-2021.2902
python27 security update
27 August 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: python27
Publisher: Red Hat
Operating System: Red Hat
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-27291 CVE-2021-23336 CVE-2021-20270
CVE-2021-20095 CVE-2021-3177 CVE-2020-28493
CVE-2020-27619
Reference: ESB-2021.2232
ESB-2021.1769
ESB-2021.1560.2
Original Bulletin:
https://access.redhat.com/errata/RHSA-2021:3252
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Red Hat Security Advisory
Synopsis: Moderate: python27 security update
Advisory ID: RHSA-2021:3252-01
Product: Red Hat Software Collections
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3252
Issue date: 2021-08-24
CVE Names: CVE-2020-27619 CVE-2020-28493 CVE-2021-3177
CVE-2021-20095 CVE-2021-20270 CVE-2021-23336
CVE-2021-27291
=====================================================================
1. Summary:
An update for python27-babel, python27-python, python27-python-jinja2, and
python27-python-pygments is now available for Red Hat Software Collections.
Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.
2. Relevant releases/architectures:
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64le, s390x, x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) - noarch, ppc64le, s390x, x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64
3. Description:
Python is an interpreted, interactive, object-oriented programming
language, which includes modules, classes, exceptions, very high level
dynamic data types and dynamic typing. Python supports interfaces to many
system calls and libraries, as well as to various windowing systems.
Security Fix(es):
* python: Unsafe use of eval() on data retrieved via HTTP in the test suite
(CVE-2020-27619)
* python-jinja2: ReDoS vulnerability due to the sub-pattern
(CVE-2020-28493)
* python: Stack-based buffer overflow in PyCArg_repr in _ctypes/callproc.c
(CVE-2021-3177)
* python-babel: Relative path traversal allows attacker to load arbitrary
locale files and execute arbitrary code (CVE-2021-20095)
* python-pygments: Infinite loop in SML lexer may lead to DoS
(CVE-2021-20270)
* python: Web cache poisoning via urllib.parse.parse_qsl and
urllib.parse.parse_qs by using a semicolon in query parameters
(CVE-2021-23336)
* python-pygments: ReDoS via crafted malicious input (CVE-2021-27291)
For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.
Additional information
* Changes in the default separator for the Python urllib parsing functions
To mitigate the Web Cache Poisoning CVE-2021-23336 in the Python urllib
library, the default separator for the urllib.parse.parse_qsl and
urllib.parse.parse_qs functions is being changed from both ampersand (&)
and semicolon (;) to only an ampersand.
The change of the default separator is potentially backwards incompatible,
therefore Red Hat provides a way to configure the behavior in Python
packages where the default separator has been changed. In addition, the
affected urllib parsing functions issue a warning if they detect that a
customerâ\x{128}\x{153}s application has been affected by the change.
For more information, see the Knowledgebase article "Mitigation of Web
Cache Poisoning in the Python urllib library (CVE-2021-23336)" linked from
the References section.
4. Solution:
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
https://access.redhat.com/articles/11258
5. Bugs fixed (https://bugzilla.redhat.com/):
1889886 - CVE-2020-27619 python: Unsafe use of eval() on data retrieved via HTTP in the test suite
1918168 - CVE-2021-3177 python: Stack-based buffer overflow in PyCArg_repr in _ctypes/callproc.c
1922136 - CVE-2021-20270 python-pygments: Infinite loop in SML lexer may lead to DoS
1928707 - CVE-2020-28493 python-jinja2: ReDoS vulnerability due to the sub-pattern
1928904 - CVE-2021-23336 python: Web cache poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a semicolon in query parameters
1940603 - CVE-2021-27291 python-pygments: ReDoS via crafted malicious input
1955615 - CVE-2021-20095 python-babel: Relative path traversal allows attacker to load arbitrary locale files and execute arbitrary code
6. Package List:
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7):
Source:
python27-babel-0.9.6-10.el7.src.rpm
python27-python-2.7.18-3.el7.src.rpm
python27-python-jinja2-2.6-16.el7.src.rpm
python27-python-pygments-1.5-5.el7.src.rpm
noarch:
python27-babel-0.9.6-10.el7.noarch.rpm
python27-python-babel-0.9.6-10.el7.noarch.rpm
python27-python-jinja2-2.6-16.el7.noarch.rpm
python27-python-pygments-1.5-5.el7.noarch.rpm
ppc64le:
python27-python-2.7.18-3.el7.ppc64le.rpm
python27-python-debug-2.7.18-3.el7.ppc64le.rpm
python27-python-debuginfo-2.7.18-3.el7.ppc64le.rpm
python27-python-devel-2.7.18-3.el7.ppc64le.rpm
python27-python-libs-2.7.18-3.el7.ppc64le.rpm
python27-python-test-2.7.18-3.el7.ppc64le.rpm
python27-python-tools-2.7.18-3.el7.ppc64le.rpm
python27-tkinter-2.7.18-3.el7.ppc64le.rpm
s390x:
python27-python-2.7.18-3.el7.s390x.rpm
python27-python-debug-2.7.18-3.el7.s390x.rpm
python27-python-debuginfo-2.7.18-3.el7.s390x.rpm
python27-python-devel-2.7.18-3.el7.s390x.rpm
python27-python-libs-2.7.18-3.el7.s390x.rpm
python27-python-test-2.7.18-3.el7.s390x.rpm
python27-python-tools-2.7.18-3.el7.s390x.rpm
python27-tkinter-2.7.18-3.el7.s390x.rpm
x86_64:
python27-python-2.7.18-3.el7.x86_64.rpm
python27-python-debug-2.7.18-3.el7.x86_64.rpm
python27-python-debuginfo-2.7.18-3.el7.x86_64.rpm
python27-python-devel-2.7.18-3.el7.x86_64.rpm
python27-python-libs-2.7.18-3.el7.x86_64.rpm
python27-python-test-2.7.18-3.el7.x86_64.rpm
python27-python-tools-2.7.18-3.el7.x86_64.rpm
python27-tkinter-2.7.18-3.el7.x86_64.rpm
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7):
Source:
python27-babel-0.9.6-10.el7.src.rpm
python27-python-2.7.18-3.el7.src.rpm
python27-python-jinja2-2.6-16.el7.src.rpm
python27-python-pygments-1.5-5.el7.src.rpm
noarch:
python27-babel-0.9.6-10.el7.noarch.rpm
python27-python-babel-0.9.6-10.el7.noarch.rpm
python27-python-jinja2-2.6-16.el7.noarch.rpm
python27-python-pygments-1.5-5.el7.noarch.rpm
ppc64le:
python27-python-2.7.18-3.el7.ppc64le.rpm
python27-python-debug-2.7.18-3.el7.ppc64le.rpm
python27-python-debuginfo-2.7.18-3.el7.ppc64le.rpm
python27-python-devel-2.7.18-3.el7.ppc64le.rpm
python27-python-libs-2.7.18-3.el7.ppc64le.rpm
python27-python-test-2.7.18-3.el7.ppc64le.rpm
python27-python-tools-2.7.18-3.el7.ppc64le.rpm
python27-tkinter-2.7.18-3.el7.ppc64le.rpm
s390x:
python27-python-2.7.18-3.el7.s390x.rpm
python27-python-debug-2.7.18-3.el7.s390x.rpm
python27-python-debuginfo-2.7.18-3.el7.s390x.rpm
python27-python-devel-2.7.18-3.el7.s390x.rpm
python27-python-libs-2.7.18-3.el7.s390x.rpm
python27-python-test-2.7.18-3.el7.s390x.rpm
python27-python-tools-2.7.18-3.el7.s390x.rpm
python27-tkinter-2.7.18-3.el7.s390x.rpm
x86_64:
python27-python-2.7.18-3.el7.x86_64.rpm
python27-python-debug-2.7.18-3.el7.x86_64.rpm
python27-python-debuginfo-2.7.18-3.el7.x86_64.rpm
python27-python-devel-2.7.18-3.el7.x86_64.rpm
python27-python-libs-2.7.18-3.el7.x86_64.rpm
python27-python-test-2.7.18-3.el7.x86_64.rpm
python27-python-tools-2.7.18-3.el7.x86_64.rpm
python27-tkinter-2.7.18-3.el7.x86_64.rpm
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7):
Source:
python27-babel-0.9.6-10.el7.src.rpm
python27-python-2.7.18-3.el7.src.rpm
python27-python-jinja2-2.6-16.el7.src.rpm
python27-python-pygments-1.5-5.el7.src.rpm
noarch:
python27-babel-0.9.6-10.el7.noarch.rpm
python27-python-babel-0.9.6-10.el7.noarch.rpm
python27-python-jinja2-2.6-16.el7.noarch.rpm
python27-python-pygments-1.5-5.el7.noarch.rpm
x86_64:
python27-python-2.7.18-3.el7.x86_64.rpm
python27-python-debug-2.7.18-3.el7.x86_64.rpm
python27-python-debuginfo-2.7.18-3.el7.x86_64.rpm
python27-python-devel-2.7.18-3.el7.x86_64.rpm
python27-python-libs-2.7.18-3.el7.x86_64.rpm
python27-python-test-2.7.18-3.el7.x86_64.rpm
python27-python-tools-2.7.18-3.el7.x86_64.rpm
python27-tkinter-2.7.18-3.el7.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
7. References:
https://access.redhat.com/security/cve/CVE-2020-27619
https://access.redhat.com/security/cve/CVE-2020-28493
https://access.redhat.com/security/cve/CVE-2021-3177
https://access.redhat.com/security/cve/CVE-2021-20095
https://access.redhat.com/security/cve/CVE-2021-20270
https://access.redhat.com/security/cve/CVE-2021-23336
https://access.redhat.com/security/cve/CVE-2021-27291
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/articles/5860431
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2021 Red Hat, Inc.
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