Bug 163011

Summary:	CUPS daemon crash from IPP/SSL bug when repeatedly requesting web interface (possible DoS)
Product:	Red Hat Enterprise Linux 4	Reporter:	Pete Harvey <peter.harvey>
Component:	cups	Assignee:	Tim Waugh <twaugh>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	medium
Version:	4.0
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:	RHBA-2006-0323	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2006-08-10 21:20:38 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:
Bug Blocks:	169933, 181409

Description Pete Harvey 2005-07-12 08:21:26 UTC

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050524 Fedora/1.0.4-4 Firefox/1.0.4

Description of problem:
If you configure CUPS to require SSL encrypted IPP connections it's possible to crash the CUPS server daemon by quickly and repeatedly requesting pages from the web interface.

Version-Release number of selected component (if applicable):
cups-1.1.22-0.rc1.9.6

How reproducible:
Always

Steps to Reproduce:
1. Configure CUPS to require SSL IPP connections.
2. Connect with a web browser to the web interface over the SSL port, eg: https://cupsserver:631/printers/testprinter
3. Hit refresh in the browser quickly several times, the CUPS daemon will crash after ~3 refreshes.
  

Actual Results:  CUPS daemon crashes with the following in /var/log/cups/error_log:
E [12/Jul/2005:09:07:34 +0100] CloseClient: error:1409F07F:SSL routines:SSL3_WRITE_PENDING:bad write retry
E [12/Jul/2005:09:07:34 +0100] CloseClient: error:1409F07F:SSL routines:SSL3_WRITE_PENDING:bad write retry


Expected Results:  Daemon shouldn't crash :)

Additional info:

Comment 1 Tim Waugh 2005-08-02 12:35:44 UTC

How precisely are you configuring CUPS to require SSL IPP connections?  Are you
putting "Encryption Required" in cupsd.conf?  Which section are you putting it in?

Comment 2 Pete Harvey 2005-08-15 14:13:37 UTC

Config file snippet:


SSLPort 443
..

<Location /printers>
 Order Deny,Allow
 Allow From x.x.x.x/24
 AuthType Basic
 AuthClass User
 Encryption required
 Satisfy all
</Location>

Comment 3 Tim Waugh 2005-08-15 16:00:57 UTC

2. Connect with a web browser to the web interface over the SSL port, eg:
https://cupsserver:631/printers/testprinter

Can you clarify this please?  Do you mean
'https://cupsserver:443/printers/testprinter'?

Comment 5 Pete Harvey 2005-08-16 10:07:20 UTC

Yep sorry, that should've been:

SSLPort 631

Comment 6 Tim Waugh 2005-10-05 12:49:34 UTC

Confirmed.

Comment 8 Tim Waugh 2005-10-05 13:28:30 UTC

Reported upstream as: http://www.cups.org/str.php?L1290

Comment 17 Bob Johnson 2006-04-11 16:37:47 UTC

This issue is on Red Hat Engineering's list of planned work items 
for the upcoming Red Hat Enterprise Linux 4.4 release.  Engineering 
resources have been assigned and barring unforeseen circumstances, Red 
Hat intends to include this item in the 4.4 release.

Comment 21 Red Hat Bugzilla 2006-08-10 21:20:38 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2006-0323.html