USN-5138-1: python-py vulnerability

Releases

• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• 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

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

Ubuntu 18.04

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

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

References

• CVE-2020-29651