Bug 607211 (CVE-2010-2432)

Summary: CVE-2010-2432 cups: DoS (infinite loop) via HTTP_UNAUTHORIZED responses STR #3518
Product: [Other] Security Response Reporter: Jan Lieskovsky <jlieskov>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: twaugh, vdanen
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
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Clone Of: Environment:
Last Closed: 2010-08-23 11:56:41 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 607219    
Bug Blocks:    
Attachments:
Description Flags
Local copy of upstream CVE-2010-2432 / STR #3518 patch none

Description Jan Lieskovsky 2010-06-23 14:16:19 UTC 
Common Vulnerabilities and Exposures assigned an identifier CVE-2010-2432 to
the following vulnerability:

The cupsDoAuthentication function in auth.c in the client in CUPS
before 1.4.4, when HAVE_GSSAPI is omitted, does not properly handle a
demand for authorization, which allows remote CUPS servers to cause a
denial of service (infinite loop) via HTTP_UNAUTHORIZED responses.

References:
  [1] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2432
  [2] http://cups.org/articles.php?L596
  [3] http://cups.org/str.php?L3518

Upstream patch:
  svn diff -c r9020 http://svn.easysw.com/public/cups/trunk/
Comment 1 Jan Lieskovsky 2010-06-23 14:21:21 UTC 
This issue did NOT affect the version of the cups package, as shipped
with Red Hat Enterprise Linux 3.

This issue affects the versions of the cups package, as shipped with
Red Hat Enterprise Linux 4 and 5.

This issue did NOT affect (is already addressed) in the current versions
of the cups package, as shipped with Fedora releases of 11, 12, and 13.
Comment 4 Jan Lieskovsky 2010-06-23 14:28:38 UTC 
Created attachment 426285 [details]
Local copy of upstream CVE-2010-2432 / STR #3518 patch
Comment 5 Vincent Danen 2010-06-23 14:43:24 UTC 
Statement:

Not vulnerable. This issue did not affect the versions of CUPS as shipped with Red Hat Enterprise Linux 3, 4, or 5.
Comment 6 Tomas Hoger 2010-08-17 14:36:45 UTC 
(In reply to comment #1)
> This issue affects the versions of the cups package, as shipped with
> Red Hat Enterprise Linux 4 and 5.

This does not sound right to me.  CUPS in RHEL-5 is built with GSSAPI support, so for Negotiate authentications, "too many tries" error is hit.  For Basic and Digest authentication, password callback function is called again to ask for a different password.  There does not seem to be a limit on number of password callback calls, but that behaviour matches upstream behaviour in 1.4.4 (fixed version).

RHEL-4 CUPS does not support Negotiate and password callback is called in case of Basic or Digest failures.
Comment 7 Tomas Hoger 2010-08-23 11:56:41 UTC 
Upstream confirms that not limiting number of password callback calls is intended behaviour.  Closing this notabug, with updated statement in comment #5.