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Security Bulletin: Vulnerability CVE-2020-8492 in Python affects IBM i

Security Bulletin


Summary

Python is supported by IBM i. IBM i has addressed the applicable CVE.

Vulnerability Details

CVEID:   CVE-2020-8492
DESCRIPTION:   Python is vulnerable to a denial of service, caused by a flaw in the urllib.request.AbstractBasicAuthHandler. By sending a specially crafted request, a remote attacker could exploit this vulnerability to cause a Regular Expression Denial of Service (ReDoS).
CVSS Base score: 5.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/175462 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

Affected Products and Versions

Affected Product(s)Version(s)
IBM i7.4
IBM i7.3
IBM i7.2

Remediation/Fixes

Releases 7.4, 7.3 and 7.2 of IBM i are supported and will be fixed.  The issue can be fixed by installing an rpm update based on Python version.

IBM recommends users stay up to date with all packages. 
Command line instructions:
To update all installed packages
yum upgrade

To update Python 3 to the latest version
yum upgrade python3


ACS GUI instructions:
Open the ACS Package Management GUI using Tools -> Open Source Package Management.
From the Updates Available tab, select the packages to update (multiples can be selected using Ctrl + click).
When all packages have been selected, click the Upgrade button and follow the directions on the terminal.

Updated package:
python3-3.6.10-2.ibmi7.2.ppc64.rpm

Note: More recent versions of these packages may be available.

For more information about the packages in rpm format, see http://ibm.biz/ibmi-rpms

Important note: IBM recommends that all users running unsupported versions of affected products upgrade to supported and fixed version of affected products.

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

References

Off

Change History

05 May 2020: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

Document Location

Worldwide

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Document Information

Modified date:
06 May 2020

UID

ibm16206164