Moderate: cups security and bug fix update

Synopsis

Moderate: cups security and bug fix update

Type/Severity

Security Advisory: Moderate

Topic

An update for cups is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The Common UNIX Printing System (CUPS) provides a portable printing layer for Linux, UNIX, and similar operating systems.

Security Fix(es):

• cups: Local privilege escalation to root due to insecure environment variable handling (CVE-2018-4180)
  
• cups: Manipulation of cupsd.conf by a local attacker resulting in limited reads of arbitrary files as root (CVE-2018-4181)
  
• cups: Predictable session cookie breaks CSRF protection (CVE-2018-4700)
  

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.8 Release Notes linked from the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, the cupsd service will be restarted automatically.

Affected Products

• Red Hat Enterprise Linux Server 7 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le

Fixes

• BZ - 1607282 - CVE-2018-4180 cups: Local privilege escalation to root due to insecure environment variable handling
• BZ - 1607291 - CVE-2018-4181 cups: Manipulation of cupsd.conf by a local attacker resulting in limited reads of arbitrary files as root
• BZ - 1649347 - CVE-2018-4700 cups: Predictable session cookie breaks CSRF protection

CVEs

• CVE-2018-4180
• CVE-2018-4181
• CVE-2018-4700

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.8_release_notes/index