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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3852
                    USN-5138-1: python-py vulnerability
                             11 November 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           python-py
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-29651  

Reference:         ESB-2021.2307
                   ESB-2021.1960

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-5138-1

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USN-5138-1: python-py vulnerability
10 November 2021

python-py could be made to crash if provided with specially crafted input.
Releases

  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS

Packages

  o python-py - Advanced Python development support library

Details

The py.path.svnwc component of py (aka python-py) through v1.9.0 contains
a regular expression with an ambiguous subpattern that is susceptible to
catastrophic backtracing. This could be used by attackers to cause a
compute-time
denial of service attack by supplying malicious input to the blame
functionality.

Update instructions

The problem can be corrected by updating your system to the following package
versions:

Ubuntu 20.04

  o pypy-py - 1.8.1-1ubuntu0.1
  o python3-py - 1.8.1-1ubuntu0.1
  o python-py - 1.8.1-1ubuntu0.1

Ubuntu 18.04

  o pypy-py - 1.5.2-1ubuntu0.1
  o python3-py - 1.5.2-1ubuntu0.1
  o python-py - 1.5.2-1ubuntu0.1

In general, a standard system update will make all the necessary changes.

References

  o CVE-2020-29651

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