Bug 771778 - (CVE-2011-4577) CVE-2011-4577 openssl: malformed RFC 3779 data can cause assertion failures
CVE-2011-4577 openssl: malformed RFC 3779 data can cause assertion failures
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20120104,repor...
: Security
Depends On: 773239 773240 773330 773331 846586
Blocks: 771783
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Reported: 2012-01-04 17:47 EST by Vincent Danen
Modified: 2015-11-24 09:46 EST (History)
8 users (show)

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Doc Type: Bug Fix
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Last Closed: 2012-09-25 03:57:00 EDT
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Description Vincent Danen 2012-01-04 17:47:28 EST
Malformed RFC 3779 Data Can Cause Assertion Failures (CVE-2011-4577)
====================================================================

RFC 3779 data can be included in certificates, and if it is malformed,
may trigger an assertion failure. This could be used in a
denial-of-service attack.

Note, however, that in the standard release of OpenSSL, RFC 3779
support is disabled by default, and in this case OpenSSL is not
vulnerable. Builds of OpenSSL are vulnerable if configured with 
"enable-rfc3779".

Thanks to Andrew Chi, BBN Technologies, for discovering the flaw, and
Rob Austein <sra@hactrn.net> for fixing it.

Affected users should upgrade to OpenSSL 1.0.0f or 0.9.8s.

Reference: http://openssl.org/news/secadv_20120104.txt
Comment 1 Vincent Danen 2012-01-04 18:07:54 EST
Seems to be the fix here:

http://cvs.openssl.org/chngview?cn=21955
Comment 2 Tomas Mraz 2012-01-05 02:38:20 EST
Unfortunately we do enable RFC3779 on RHEL-6 and Fedora.
Comment 3 Tomas Hoger 2012-01-05 07:59:28 EST
According to upstream NEWS file, support for RFC 3779 was introduced in version 0.9.8e.  Hence the affected code is present in the sources for openssl in Red Hat Enterprise Linux 5 and openssl098e in Red Hat Enterprise Linux 6, but is not compiled in and used.  Hence those versions are not affected by this issue.
Comment 4 Fedora Update System 2012-01-11 01:13:19 EST
openssl-1.0.0f-1.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 6 Tomas Hoger 2012-01-11 09:52:51 EST
Created mingw32-openssl tracking bugs for this issue

Affects: fedora-all [bug 773330]
Affects: epel-5 [bug 773331]
Comment 7 Fedora Update System 2012-01-15 15:09:56 EST
openssl-1.0.0f-1.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 8 Vincent Danen 2012-01-18 17:08:20 EST
Statement:

This issue did not affect the versions of openssl as shipped with Red Hat Enterprise Linux 3, 4 and 5.
Comment 13 errata-xmlrpc 2012-01-24 16:05:27 EST
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2012:0059 https://rhn.redhat.com/errata/RHSA-2012-0059.html
Comment 14 errata-xmlrpc 2012-02-15 11:09:46 EST
This issue has been addressed in following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2012:0109 https://rhn.redhat.com/errata/RHSA-2012-0109.html

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