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Bug 232243 - CVE-2007-0720 Incomplete SSL negotiation prevents other clients from connecting to CUPS server
Summary: CVE-2007-0720 Incomplete SSL negotiation prevents other clients from connecti...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: cups
Version: 5
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Tim Waugh
QA Contact:
URL: http://lists.apple.com/archives/secur...
Whiteboard: impact=moderate,source=cve,reported=2...
Depends On: 232241
Blocks:
TreeView+ depends on / blocked
 
Reported: 2007-03-14 15:32 UTC by Lubomir Kundrak
Modified: 2008-02-22 10:28 UTC (History)
0 users

Fixed In Version: 1.2.8-1.fc5
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2008-02-22 10:28:13 UTC


Attachments (Terms of Use)

Description Lubomir Kundrak 2007-03-14 15:32:48 UTC
+++ This bug was initially created as a clone of Bug #232241 +++

Description of problem:

CUPS doesn't use separate workers for connections. During SSL
negotiation it does not accept new connections from anyone so
any user can DoS the server with unfinished negotiation.

Version-Release number of selected component (if applicable):

Both 1.2 <= 1.2.7 and 1.1 are affected.
I was able to reproduce on RHEL4, RHEL5.
FC6 (1.2.7) is already fixed.

How reproducible:

SSL support needs to be enabled. Default in 1.2.

Steps to Reproduce:
1. Launch the attached reproducer (eventually modify appropriately)
2. Let it run for at least 10 secs (to ensure that the server is not patched)
3. Attempt another connection to the CUPS server.
  
Actual results:

Hang.

Additional info:

The relevant fix:
http://www.cups.org/articles.php?L429+I10+T+P1+Q (r6110, r6081, r6079)

-- Additional comment from lkundrak@redhat.com on 2007-03-14 11:29 EST --
Created an attachment (id=150051)
CVE-2007-0720 CUPS incomplete SSL negotiation DoS reproducer

For 1.1, you'll likely use a different port number.

Comment 1 Tomas Hoger 2008-02-22 10:15:08 UTC
This was fixed for cups in Red Hat Enterprise Linux 5 in:

  https://rhn.redhat.com/errata/RHSA-2007-0123.html

Tim, ok to close this one?

Comment 2 Tim Waugh 2008-02-22 10:28:13 UTC
Yes.


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