Bug 207274 - CVE-2006-2940 OpenSSL Parasitic Public Keys
CVE-2006-2940 OpenSSL Parasitic Public Keys
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: openssl (Show other bugs)
4.0
All Linux
medium Severity medium
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Assigned To: Tomas Mraz
Brian Brock
reported=20060703,source=openssl,impa...
: Security
Depends On:
Blocks: 209116 CVE-2006-2940
  Show dependency treegraph
 
Reported: 2006-09-20 07:45 EDT by Mark J. Cox (Product Security)
Modified: 2008-01-29 05:58 EST (History)
1 user (show)

See Also:
Fixed In Version: RHSA-2006-0695
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Environment:
Last Closed: 2006-09-28 20:05:53 EDT
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
proposed patch CVE-2006-2940 (12.49 KB, text/x-patch)
2006-09-25 05:18 EDT, Mark J. Cox (Product Security)
no flags Details
replacement patch CVE-2006-2940 (11.76 KB, patch)
2006-09-25 05:23 EDT, Mark J. Cox (Product Security)
no flags Details | Diff

  None (edit)
Description Mark J. Cox (Product Security) 2006-09-20 07:45:44 EDT
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 (Product Security) 2006-09-25 05:18:41 EDT
Created attachment 137035 [details]
proposed patch CVE-2006-2940
Comment 2 Mark J. Cox (Product Security) 2006-09-25 05:23:56 EDT
Created attachment 137036 [details]
replacement patch CVE-2006-2940
Comment 5 Mark J. Cox (Product Security) 2006-09-28 09:27:05 EDT
removing embargo, public at http://www.openssl.org/news/secadv_20060928.txt
Comment 6 Red Hat Bugzilla 2006-09-28 20:05:53 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/RHSA-2006-0695.html

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