Bug 163011 - CUPS daemon crash from IPP/SSL bug when repeatedly requesting web interface (possible DoS)
CUPS daemon crash from IPP/SSL bug when repeatedly requesting web interface (...
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: cups (Show other bugs)
4.0
i386 Linux
medium Severity high
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Assigned To: Tim Waugh
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Depends On:
Blocks: 169933 181409
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Reported: 2005-07-12 04:21 EDT by Pete Harvey
Modified: 2007-11-30 17:07 EST (History)
0 users

See Also:
Fixed In Version: RHBA-2006-0323
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Environment:
Last Closed: 2006-08-10 17:20:38 EDT
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CRM:
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RHEL 7.3 requirements from Atomic Host:
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Description Pete Harvey 2005-07-12 04:21:26 EDT
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 08:35:44 EDT
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 10:13:37 EDT
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 12:00:57 EDT
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 06:07:20 EDT
Yep sorry, that should've been:

SSLPort 631
Comment 6 Tim Waugh 2005-10-05 08:49:34 EDT
Confirmed.
Comment 8 Tim Waugh 2005-10-05 09:28:30 EDT
Reported upstream as: http://www.cups.org/str.php?L1290
Comment 17 Bob Johnson 2006-04-11 12:37:47 EDT
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 17:20:38 EDT
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

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