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AUSCERT External Security Bulletin Redistribution
ESB-2021.0899
USN-4754-3: Python vulnerabilities
15 March 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Python
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3177 CVE-2020-27619 CVE-2020-26116
CVE-2020-8492 CVE-2019-20907 CVE-2019-17514
CVE-2019-9674
Reference: ESB-2021.0844
ESB-2021.0764
ESB-2021.0647
Original Bulletin:
https://ubuntu.com/security/notices/USN-4754-3
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USN-4754-3: Python vulnerabilities
12 March 2021
Several security issues were fixed in Python 2.7 and Python 3.8.
Releases
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o python2.7 - An interactive high-level object-oriented language
o python3.7 - An interactive high-level object-oriented language
o python3.8 - An interactive high-level object-oriented language
Details
USN-4754-1 fixed vulnerabilities in Python. This update provides
the corresponding updates for Ubuntu 18.04 ESM and Ubuntu 20.04 ESM.
In the case of Python 2.7 for 20.04 ESM, these additional fixes are included:
It was dicovered that Python allowed remote attackers to cause a denial of
service (resource consumption) via a ZIP bomb. ( CVE-2019-9674 )
It was discovered that Python had potentially misleading information about
whether sorting occurs. This fix updates the documentation about it.
( CVE-2019-17514 )
It was discovered that Python incorrectly handled certain TAR archives.
An attacker could possibly use this issue to cause a denial of service.
( CVE-2019-20907 )
It was discovered that Python allowed an HTTP server to conduct Regular
Expression Denial of Service (ReDoS) attacks against a client because of
urllib.request.AbstractBasicAuthHandler catastrophic backtracking.
( CVE-2020-8492 )
It was discovered that Python allowed CRLF injection if the attacker controls
the HTTP request method, as demonstrated by inserting CR and LF control
characters in the first argument of HTTPConnection.request. ( CVE-2020-26116 )
Original advisory details:
It was discovered that Python incorrectly handled certain inputs.
An attacker could possibly use this issue to execute arbitrary code
or cause a denial of service. ( CVE-2020-27619 , CVE-2021-3177 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o python2.7-minimal - 2.7.18-1~20.04.1
o python2.7 - 2.7.18-1~20.04.1
Ubuntu 18.04
o python3.8-minimal - 3.8.0-3~18.04.1
o python3.7 - 3.7.5-2~18.04.4
o python3.8 - 3.8.0-3~18.04.1
o python3.7-minimal - 3.7.5-2~18.04.4
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-8492
o CVE-2019-17514
o CVE-2019-9674
o CVE-2021-3177
o CVE-2019-20907
o CVE-2020-26116
o CVE-2020-27619
Related notices
o USN-4581-1 : python3.6-minimal, python3.4, python2.7-minimal, python3.5,
python3.5-minimal, python3.4-minimal, python2.7, python3.6
o USN-4333-1 : python3.6-minimal, python3.4, python2.7-minimal, python3.5,
python3.5-minimal, python3.7, python3.7-minimal, python3.4-minimal,
python2.7, python3.6
o USN-4428-1 : python3.6-minimal, python3.4, python2.7-minimal, python3.5,
python3.8, python3.8-minimal, python3.5-minimal, python3.4-minimal,
python2.7, python3.6
o USN-4754-1 : python3.6-minimal, python3.4, python2.7-minimal, python3.5,
python3.8, python3.8-minimal, python3.5-minimal, python3.4-minimal,
python2.7, python3.6
o USN-4333-2 : python3.8-minimal, python3.8
o USN-4754-4 : python2.7-minimal, python2.7
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