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USN-4446-1: Squid vulnerabilities

3 August 2020

Several security issues were fixed in Squid.

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Releases

Packages

  • squid3 - Web proxy cache server

Details

Jeriko One discovered that Squid incorrectly handled caching certain
requests. A remote attacker could possibly use this issue to perform
cache-injection attacks or gain access to reverse proxy features such as
ESI. (CVE-2019-12520)

Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly
handled certain URN requests. A remote attacker could possibly use this
issue to bypass access checks. (CVE-2019-12523)

Jeriko One discovered that Squid incorrectly handled URL decoding. A remote
attacker could possibly use this issue to bypass certain rule checks.
(CVE-2019-12524)

Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly
handled input validation. A remote attacker could use this issue to cause
Squid to crash, resulting in a denial of service. (CVE-2019-18676)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 18.04
Ubuntu 16.04

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

Related notices

  • USN-4213-1: squid-cgi, squid-common, squid3, squid, squid-purge, squidclient