Bug 207274

Summary: CVE-2006-2940 OpenSSL Parasitic Public Keys
Product: Red Hat Enterprise Linux 4 Reporter: Mark J. Cox <mjc>
Component: opensslAssignee: Tomas Mraz <tmraz>
Status: CLOSED ERRATA QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 4.0CC: security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard: reported=20060703,source=openssl,impact=important,public=20060928
Fixed In Version: RHSA-2006-0695 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2006-09-29 00:05:53 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: 209116, 430654    
Attachments:
Description Flags
proposed patch CVE-2006-2940
none
replacement patch CVE-2006-2940 none

Description Mark J. Cox 2006-09-20 11:45:44 UTC 
Dr S N Henson of the OpenSSL core team and Open Network Security recently
developed an ASN1 test suite for NISCC (www.niscc.gov.uk). When the test suite
was run against OpenSSL a denial of service vulnerability was discovered.

Certain types of public key can take disproportionate amounts of time to
process. This could be used by an attacker in a denial of service attack.
CVE-2006-2940

Any code which uses OpenSSL to parse ASN1 data from untrusted sources is
affected. This includes SSL servers which enable client authentication and
S/MIME applications.

This issue was co-ordinated through NISCC although currently no patch exists. 
The final patch will reject keys which exceed certain limits.  These limits are
similar to those already enforced by other crypto libraries such as NSS.

Embargo until 20060928
Also affects (all RHEL)
Comment 1 Mark J. Cox 2006-09-25 09:18:41 UTC 
Created attachment 137035 [details]
proposed patch CVE-2006-2940
Comment 2 Mark J. Cox 2006-09-25 09:23:56 UTC 
Created attachment 137036 [details]
replacement patch CVE-2006-2940
Comment 5 Mark J. Cox 2006-09-28 13:27:05 UTC 
removing embargo, public at http://www.openssl.org/news/secadv_20060928.txt
Comment 6 Red Hat Bugzilla 2006-09-29 00:05:53 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/RHSA-2006-0695.html