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Published on November 12th, 2021 📆 | 7004 Views ⚑

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Ubuntu Security Notice USN-5138-1 – Torchsec

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Ubuntu Security Notice USN-5138-1
November 10, 2021

python-py vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

– Ubuntu 20.04 LTS
– Ubuntu 18.04 LTS

Summary:

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

Software Description:
– 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 LTS:
pypy-py 1.8.1-1ubuntu0.1
python-py 1.8.1-1ubuntu0.1
python3-py 1.8.1-1ubuntu0.1

Ubuntu 18.04 LTS:
pypy-py 1.5.2-1ubuntu0.1
python-py 1.5.2-1ubuntu0.1
python3-py 1.5.2-1ubuntu0.1

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

References:
https://ubuntu.com/security/notices/USN-5138-1
CVE-2020-29651

Package Information:
https://launchpad.net/ubuntu/+source/python-py/1.8.1-1ubuntu0.1
https://launchpad.net/ubuntu/+source/python-py/1.5.2-1ubuntu0.1


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