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USN-4673-1: libproxy vulnerability

4 January 2021

libproxy could be made to crash or execute arbitrary code if it received a specially crafted file.



  • libproxy - automatic proxy configuration management library


Li Fei discovered that libproxy incorrectly handled certain PAC files.
An attacker could possibly use this issue to cause a crash or execute arbitrary

Update instructions

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

Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

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