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AUSCERT External Security Bulletin Redistribution
ESB-2021.0033
USN-4673-1: libproxy vulnerability
5 January 2021
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AusCERT Security Bulletin Summary
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Product: libproxy
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-26154
Reference: ESB-2020.4220
ESB-2020.4054
ESB-2020.3524
Original Bulletin:
https://ubuntu.com/security/notices/USN-4673-1
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USN-4673-1: libproxy vulnerability
04 January 2021
libproxy could be made to crash or execute arbitrary code if it received a specially
crafted file.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o libproxy - automatic proxy configuration management library
Details
Li Fei discovered that libproxy incorrectly handled certain PAC files.
An attacker could possibly use this issue to cause a crash or execute arbitrary
code.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o libproxy1v5 - 0.4.15-13ubuntu1.1
Ubuntu 20.04
o libproxy1v5 - 0.4.15-10ubuntu1.2
Ubuntu 18.04
o libproxy1v5 - 0.4.15-1ubuntu0.2
Ubuntu 16.04
o libproxy1v5 - 0.4.11-5ubuntu1.2
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-26154
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