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Ubuntu Security Notice USN-4981-1

Ubuntu Security Notice USN-4981-1
Posted Jun 4, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4981-1 - 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. 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. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2021-28651, CVE-2021-28652, CVE-2021-28662, CVE-2021-31807, CVE-2021-31808, CVE-2021-33620
MD5 | dc785af17f095adce3188290ba6dc2cb

Ubuntu Security Notice USN-4981-1

Change Mirror Download
==========================================================================
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:
https://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:
https://launchpad.net/ubuntu/+source/squid/4.13-1ubuntu4.1
https://launchpad.net/ubuntu/+source/squid/4.13-1ubuntu2.2
https://launchpad.net/ubuntu/+source/squid/4.10-1ubuntu1.4
https://launchpad.net/ubuntu/+source/squid3/3.5.27-1ubuntu1.11

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