RHSA-2014:1388 - Security Advisory

Topic

Updated cups packages that fix multiple security issues and several bugs
are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

Description

CUPS provides a portable printing layer for Linux, UNIX, and similar
operating systems.

A cross-site scripting (XSS) flaw was found in the CUPS web interface.
An attacker could use this flaw to perform a cross-site scripting attack
against users of the CUPS web interface. (CVE-2014-2856)

It was discovered that CUPS allowed certain users to create symbolic links
in certain directories under /var/cache/cups/. A local user with the 'lp'
group privileges could use this flaw to read the contents of arbitrary
files on the system or, potentially, escalate their privileges on the
system. (CVE-2014-3537, CVE-2014-5029, CVE-2014-5030, CVE-2014-5031)

The CVE-2014-3537 issue was discovered by Francisco Alonso of Red Hat
Product Security.

These updated cups packages also include several bug fixes. Space precludes
documenting all of these changes in this advisory. Users are directed to
the Red Hat Enterprise Linux 6.6 Technical Notes, linked to in the
References section, for information on the most significant of these
changes.

All cups users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. After installing this
update, the cupsd daemon will be restarted automatically.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the
Red Hat Network to apply this update are available at
https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

• BZ - 978387 - Bad IPP responses with version 2.0 (collection handling bug)
• BZ - 1012482 - /etc/cron.daily/cups breaks rule GEN003080 in Red Hat security guide
• BZ - 1087122 - CVE-2014-2856 cups: cross-site scripting flaw fixed in the 1.7.2 release
• BZ - 1115576 - CVE-2014-3537 cups: insufficient checking leads to privilege escalation
• BZ - 1122600 - CVE-2014-5029 cups: Incomplete fix for CVE-2014-3537
• BZ - 1128764 - CVE-2014-5030 cups: allows local users to read arbitrary files via a symlink attack
• BZ - 1128767 - CVE-2014-5031 cups: world-readable permissions

CVEs

• CVE-2014-3537
• CVE-2014-2856
• CVE-2014-5029
• CVE-2014-5030
• CVE-2014-5031

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.6_Technical_Notes/cups.html#RHSA-2014-1388