Important: cups security and bug fix update

Updated CUPS packages that fix a security issue in the Internet Printing
Protocol (IPP) handling and correct some bugs are now available for Red Hat
Enterprise Linux 5.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

The Common UNIX Printing System (CUPS) provides a portable printing layer
for UNIX(R) operating systems.

A flaw was found in the way CUPS handles certain Internet Printing Protocol
(IPP) tags. A remote attacker who is able to connect to the IPP TCP port
could send a malicious request causing the CUPS daemon to crash, or
potentially execute arbitrary code. Please note that the default CUPS
configuration does not allow remote hosts to connect to the IPP TCP port.
(CVE-2007-4351)

Red Hat would like to thank Alin Rad Pop for reporting this issue.

All CUPS users are advised to upgrade to these updated packages, which
contain a backported patch to resolve this issue.

In addition, the following bugs were fixed:

* the CUPS service has been changed to start after sshd, to avoid causing
delays when logging in when the system is booted.

* the logrotate settings have been adjusted so they do not cause CUPS to
reload its configuration. This is to avoid re-printing the current job,
which could occur when it was a long-running job.

* a bug has been fixed in the handling of the If-Modified-Since: HTTP
header.

* in the LSPP configuration, labels for labeled jobs did not line-wrap.
This has been fixed.

* an access check in the LSPP configuration has been made more secure.

* the cups-lpd service no longer ignores the "-odocument-format=..."
option.

* a memory allocation bug has been fixed in cupsd.

* support for UNIX domain sockets authentication without passwords has been
added.

* in the LSPP configuration, a problem that could lead to cupsd crashing
has been fixed.

* the error handling in the initscript has been improved.

* The job-originating-host-name attribute was not correctly set for jobs
submitted via the cups-lpd service. This has been fixed.

* a problem with parsing IPv6 addresses in the configuration file has been
fixed.

* a problem that could lead to cupsd crashing when it failed to open a
"file:" URI has been fixed.

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

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

213828 - Cups starts as S55cups, before sshd
228107 - [LSPP] Labels for labeled printing don't linewrap
229673 - [LSPP] cups is overriding mls when querying jobs with lpq -al
230073 - cups-lpd : server-args has no effect
230613 - [LSPP] cups is allowing users to delete other user's job
231522 - [LSPP] cupsd crash
237953 - Wrong init script
240223 - cups-lpd doesn't set 'job-originating-host-name'
241400 - IPV6 addresses not accepted in "Allow From" directives
250415 - cupsd crashes when failing to open a file: URI
345091 - CVE-2007-4351 cups boundary error

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4351
http://www.redhat.com/security/updates/classification/#important