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Ubuntu Security Notice USN-4446-1
August 03, 2020
squid3 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 18.04 LTS
– Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in Squid.
Software Description:
– 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)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS:
squid 3.5.27-1ubuntu1.7
Ubuntu 16.04 LTS:
squid 3.5.12-1ubuntu7.12
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4446-1
CVE-2019-12520, CVE-2019-12523, CVE-2019-12524, CVE-2019-18676
Package Information:
https://launchpad.net/ubuntu/+source/squid3/3.5.27-1ubuntu1.7
https://launchpad.net/ubuntu/+source/squid3/3.5.12-1ubuntu7.12
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