New cups packages are available for Slackware 12.0, and -current to fix security issues. The change from CUPS 1.2.x to CUPS 1.3.x was tested here, but if you're on a completely secured internal network these issues may be less of a risk than upgrading. If your IPP port is open to the internet, you'd be advised to upgrade as soon as possible (or firewall the port at the gateway if you're not in need of printer jobs coming in from the internet).

More details about the issues may be found in the Common Vulnerabilities and Exposures (CVE) database:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0047
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1373



Here are the details from the Slackware 12.0 ChangeLog:
+--------------------------+
a/cups-1.3.7-i486-1_slack12.0.tgz: Upgraded to cups-1.3.7.
This version of CUPS fixes some buffer overflows in the GIF image filter
and in cgiCompileSearch. Those running CUPS servers should upgrade.
For more information on these security issues, please see:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0047
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1373
(* Security fix *)
+--------------------------+


Where to find the new packages:
+-----------------------------+

HINT: Getting slow download speeds from ftp.slackware.com?
Give slackware.osuosl.org a try. This is another primary FTP site
for Slackware that can be considerably faster than downloading
directly from ftp.slackware.com.

Thanks to the friendly folks at the OSU Open Source Lab
(http://osuosl.org) for donating additional FTP and rsync hosting
to the Slackware project!

Also see the "Get Slack" section on http://slackware.com for
additional mirror sites near you.

Updated package for Slackware 12.0:
ftp://ftp.slackware.com/pub/slackware/slackware-12.0/patches/packages/cups-1.3.7-i486-1_slack12.0.tgz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/a/cups-1.3.7-i486-1.tgz


MD5 signatures:
+-------------+

Slackware 12.0 package:
cdc732009d2a9a24cd1d06a8be7a7c12 cups-1.3.7-i486-1_slack12.0.tgz

Slackware -current package:
54e150789acbeccc11903d14579f9590 cups-1.3.7-i486-1.tgz


Installation instructions:
+------------------------+

Upgrade the package as root:
# upgradepkg cups-1.3.7-i486-1_slack12.0.tgz


+-----+

Slackware Linux Security Team
http://slackware.com/gpg-key