USN-4213-1: Squid vulnerabilities

U

Ubuntu security notices

Guest
squid, squid3 vulnerabilities


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

  • Ubuntu 19.10
  • Ubuntu 19.04
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
Summary


Several security issues were fixed in Squid.

Software Description

  • squid - Web proxy cache server
  • squid3 - Web proxy cache server
Details


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 and access restricted servers. This issue was only addressed in Ubuntu 19.04 and Ubuntu 19.10. (CVE-2019-12523)

Jeriko One discovered that Squid incorrectly handed URN responses. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2019-12526)

Alex Rousskov discovered that Squid incorrectly handled certain strings. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu 19.04. (CVE-2019-12854)

Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly handled certain input. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue was only addressed in Ubuntu 19.04 and Ubuntu 19.10. (CVE-2019-18676)

Kristoffer Danielsson discovered that Squid incorrectly handled certain messages. This issue could result in traffic being redirected to origins it should not be delivered to. (CVE-2019-18677)

Régis Leroy discovered that Squid incorrectly handled certain HTTP request headers. A remote attacker could use this to smuggle HTTP requests and corrupt caches with arbitrary content. (CVE-2019-18678)

David Fifield discovered that Squid incorrectly handled HTTP Digest Authentication. A remote attacker could possibly use this issue to obtain pointer contents and bypass ASLR protections. (CVE-2019-18679)

Update instructions


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

Ubuntu 19.10
squid - 4.8-1ubuntu2.1
Ubuntu 19.04
squid - 4.4-1ubuntu2.3
Ubuntu 18.04 LTS
squid3 - 3.5.27-1ubuntu1.4
Ubuntu 16.04 LTS
squid3 - 3.5.12-1ubuntu7.9

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References


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