USN-3713-1: CUPS vulnerabilities

11 July 2018

cups vulnerabilities

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

  • Ubuntu 18.04 LTS
  • Ubuntu 17.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in CUPS.

Software Description

  • cups - Common UNIX Printing System™

Details

It was discovered that CUPS incorrectly handled certain print jobs with invalid usernames. A remote attacker could possibly use this issue to cause CUPS to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 17.10 and Ubuntu 18.04 LTS. (CVE-2017-18248)

Dan Bastone discovered that the CUPS dnssd backend incorrectly handled certain environment variables. A local attacker could possibly use this issue to escalate privileges. (CVE-2018-4180)

Eric Rafaloff and John Dunlap discovered that CUPS incorrectly handled certain include directives. A local attacker could possibly use this issue to read arbitrary files. (CVE-2018-4181)

Dan Bastone discovered that the CUPS AppArmor profile incorrectly confined the dnssd backend. A local attacker could possibly use this issue to escape confinement. (CVE-2018-6553)

Update instructions

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

Ubuntu 18.04 LTS
cups - 2.2.7-1ubuntu2.1
Ubuntu 17.10
cups - 2.2.4-7ubuntu3.1
Ubuntu 16.04 LTS
cups - 2.1.3-4ubuntu0.5
Ubuntu 14.04 LTS
cups - 1.7.2-0ubuntu1.10

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