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Category:   Application (Generic)  >   CUPS Vendors:   Easy Software Products
(Slackware Issues Fix) CUPS Browsing Can Be Disabled By Remote Users
SecurityTracker Alert ID:  1011398
SecurityTracker URL:  http://securitytracker.com/id/1011398
CVE Reference:   CVE-2004-0558   (Links to External Site)
Date:  Sep 23 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the Common UNIX Printing System (CUPS). A remote user can disable browsing.

Debian reported that a remote user can send a sepcially crafted UDP packet containing illegal URL characters to cupsd on port 631 to cause denial of service conditions.

The flaw resides in 'scheduler/dirsvc.c'.

Alvaro Martinez Echevarria is credited with discovering and patching the flaw.

Impact:   A remote user can disable CUPS browsing.
Solution:   Slackware has released a fix.

Updated package for Slackware 9.1:
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/cups-1.1.21-i486-1.tgz

Updated package for Slackware 10.0:
ftp://ftp.slackware.com/pub/slackware/slackware-10.0/patches/packages/cups-1.1.21-i486-1.tgz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/a/cups-1.1.21-i486-1.tgz


MD5 signatures:

Slackware 9.1 package:
b3f16be12546c626071281bc17e11739 cups-1.1.21-i486-1.tgz

Slackware 10.0 package:
6cca53545b2ea2d260a3ad4f55e22153 cups-1.1.21-i486-1.tgz

Slackware -current package:
01cc7de97fd7f6d51c3803b5c286dcff cups-1.1.21-i486-1.tgz

Vendor URL:  www.cups.org/ (Links to External Site)
Cause:   Exception handling error, Input validation error
Underlying OS:  Linux (Slackware)
Underlying OS Comments:  9.1, 10.0

Message History:   This archive entry is a follow-up to the message listed below.
Sep 15 2004 CUPS Browsing Can Be Disabled By Remote Users



 Source Message Contents

Subject:  [slackware-security] CUPS DoS (SSA:2004-266-01)



-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

[slackware-security]  CUPS DoS (SSA:2004-266-01)

New CUPS packages are available for Slackware 9.1, 10.0, and -current to
fix a denial of service issue where a malformed packet can crash the
CUPS server.

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

  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0558

Here are the details from the Slackware 10.0 ChangeLog:

+--------------------------+
patches/packages/cups-1.1.21-i486-1.tgz:  Upgraded to cups-1.1.21.
  This fixes a flaw where a remote attacker can crash the CUPS
  server causing a denial of service.
  For more details, see:
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0558
  (* Security fix *)
+--------------------------+


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

Updated package for Slackware 9.1:
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/cups-1.1.21-i486-1.tgz

Updated package for Slackware 10.0:
ftp://ftp.slackware.com/pub/slackware/slackware-10.0/patches/packages/cups-1.1.21-i486-1.tgz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/a/cups-1.1.21-i486-1.tgz


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

Slackware 9.1 package:
b3f16be12546c626071281bc17e11739  cups-1.1.21-i486-1.tgz

Slackware 10.0 package:
6cca53545b2ea2d260a3ad4f55e22153  cups-1.1.21-i486-1.tgz

Slackware -current package:
01cc7de97fd7f6d51c3803b5c286dcff  cups-1.1.21-i486-1.tgz


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

First, if the CUPS server (cupsd) is running, stop it:
. /etc/rc.d/rc.cups stop

Then upgrade using upgradepkg (as root):
upgradepkg cups-1.1.21-i486-1.tgz

Finally, restart cupsd (if needed):
. /etc/rc.d/rc.cups start


+-----+

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

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