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Ubuntu Security Notice USN-6500-1
November 21, 2023

squid vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.10
- Ubuntu 23.04
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in Squid.

Software Description:
- squid: Web proxy cache server

Details:

Joshua Rogers discovered that Squid incorrectly handled validating certain
SSL certificates. A remote attacker could possibly use this issue to cause
Squid to crash, resulting in a denial of service. This issue only affected
Ubuntu 22.04 LTS, Ubuntu 23.04, and Ubuntu 23.10. (CVE-2023-46724)

Joshua Rogers discovered that Squid incorrectly handled the Gopher
protocol. A remote attacker could possibly use this issue to cause Squid to
crash, resulting in a denial of service. Gopher support has been disabled
in this update. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04
LTS, and Ubuntu 23.04. (CVE-2023-46728)

Keran Mu and Jianjun Chen discovered that Squid incorrectly handled the
chunked decoder. A remote attacker could possibly use this issue to perform
HTTP request smuggling attacks. (CVE-2023-46846)

Joshua Rogers discovered that Squid incorrectly handled HTTP Digest
Authentication. A remote attacker could possibly use this issue to cause
Squid to crash, resulting in a denial of service. (CVE-2023-46847)

Joshua Rogers discovered that Squid incorrectly handled certain FTP urls.
A remote attacker could possibly use this issue to cause Squid to crash,
resulting in a denial of service. (CVE-2023-46848)

Update instructions:

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

Ubuntu 23.10:
   squid                           6.1-2ubuntu1.1

Ubuntu 23.04:
   squid                           5.7-1ubuntu3.1

Ubuntu 22.04 LTS:
   squid                           5.7-0ubuntu0.22.04.2

Ubuntu 20.04 LTS:
   squid                           4.10-1ubuntu1.8

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

References:
   https://ubuntu.com/security/notices/USN-6500-1
   CVE-2023-46724, CVE-2023-46728, CVE-2023-46846, CVE-2023-46847,
   CVE-2023-46848

Package Information:
   https://launchpad.net/ubuntu/+source/squid/6.1-2ubuntu1.1
   https://launchpad.net/ubuntu/+source/squid/5.7-1ubuntu3.1
   https://launchpad.net/ubuntu/+source/squid/5.7-0ubuntu0.22.04.2
   https://launchpad.net/ubuntu/+source/squid/4.10-1ubuntu1.8