RHSA-2020:1346 - Security Advisory

Topic

An update for python is now available for Red Hat Enterprise Linux 7.4 Advanced Update Support, Red Hat Enterprise Linux 7.4 Telco Extended Update Support, and Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions.

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.

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: DOS via regular expression backtracking in difflib.IS_LINE_JUNK method in difflib (CVE-2018-1061)
• python: Missing salt initialization in _elementtree.c module (CVE-2018-14647)
• python: CRLF injection via the query part of the url passed to urlopen() (CVE-2019-9740)
• python: CRLF injection via the path part of the url passed to urlopen() (CVE-2019-9947)
• python: Undocumented local_file protocol allows remote attackers to bypass protection mechanisms (CVE-2019-9948)
• python: DOS via regular expression catastrophic backtracking in apop() method in pop3lib (CVE-2018-1060)

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.

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

Affected Products

• Red Hat Enterprise Linux Server - AUS 7.4 x86_64
• Red Hat Enterprise Linux Server - TUS 7.4 x86_64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 7.4 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.4 x86_64

Fixes

• BZ - 1549191 - CVE-2018-1060 python: DOS via regular expression catastrophic backtracking in apop() method in pop3lib
• BZ - 1549192 - CVE-2018-1061 python: DOS via regular expression backtracking in difflib.IS_LINE_JUNK method in difflib
• BZ - 1631822 - CVE-2018-14647 python: Missing salt initialization in _elementtree.c module
• BZ - 1688169 - CVE-2019-9740 python: CRLF injection via the query part of the url passed to urlopen()
• BZ - 1695570 - CVE-2019-9948 python: Undocumented local_file protocol allows remote attackers to bypass protection mechanisms
• BZ - 1695572 - CVE-2019-9947 python: CRLF injection via the path part of the url passed to urlopen()

CVEs

• CVE-2018-1060
• CVE-2018-1061
• CVE-2018-14647
• CVE-2019-9740
• CVE-2019-9947
• CVE-2019-9948

References

• https://access.redhat.com/security/updates/classification/#moderate