Bug 232243

Summary:	CVE-2007-0720 Incomplete SSL negotiation prevents other clients from connecting to CUPS server
Product:	[Fedora] Fedora	Reporter:	Lubomir Kundrak <lkundrak>
Component:	cups	Assignee:	Tim Waugh <twaugh>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	5	Keywords:	Security
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
URL:	http://lists.apple.com/archives/security-announce/2007/Mar/msg00002.html
Whiteboard:	impact=moderate,source=cve,reported=20070314,public=20061113
Fixed In Version:	1.2.8-1.fc5	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2008-02-22 10:28:13 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:	232241
Bug Blocks:

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 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.