[USN-4981-1] Squid vulnerabilities

========================================================================== Ubuntu Security Notice USN-4981-1 June 03, 2021
squid, squid3 vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 21.04 – Ubuntu 20.10 – Ubuntu 20.04 LTS – Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in Squid.
Software Description: – squid: Web proxy cache server – squid3: Web proxy cache server
Details:
Joshua Rogers discovered that Squid incorrectly handled requests with the urn: scheme. A remote attacker could possibly use this issue to cause Squid to consume resources, leading to a denial of service. (CVE-2021-28651)
Joshua Rogers discovered that Squid incorrectly handled requests to the Cache Manager API. A remote attacker with access privileges could possibly use this issue to cause Squid to consume resources, leading to a denial of service. This issue was only addressed in Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-28652)
Joshua Rogers discovered that Squid incorrectly handled certain response headers. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue was only affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-28662)
Joshua Rogers discovered that Squid incorrectly handled range request processing. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. (CVE-2021-31806, CVE-2021-31807, CVE-2021-31808)
Joshua Rogers discovered that Squid incorrectly handled certain HTTP responses. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. (CVE-2021-33620)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 21.04: squid 4.13-1ubuntu4.1
Ubuntu 20.10: squid 4.13-1ubuntu2.2
Ubuntu 20.04 LTS: squid 4.10-1ubuntu1.4
Ubuntu 18.04 LTS: squid 3.5.27-1ubuntu1.11
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-4981-1 CVE-2021-28651, CVE-2021-28652, CVE-2021-28662, CVE-2021-31806, CVE-2021-31807, CVE-2021-31808, CVE-2021-33620
Package Information: launchpad.net/ubuntu/+source/squid/4.13-1ubuntu4.1 launchpad.net/ubuntu/+source/squid/4.13-1ubuntu2.2 launchpad.net/ubuntu/+source/squid/4.10-1ubuntu1.4 launchpad.net/ubuntu/+source/squid3/3.5.27-1ubuntu1.11