Bug 782795 - (CVE-2012-0050) CVE-2012-0050 openssl: remote DTLS server DoS introduced in the CVE-2011-4108 fix
CVE-2012-0050 openssl: remote DTLS server DoS introduced in the CVE-2011-4108...
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20110118,repo...
: Security
Depends On: 783122
Blocks: 771783
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Reported: 2012-01-18 09:12 EST by Tomas Hoger
Modified: 2012-02-15 11:24 EST (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2012-02-15 11:24:43 EST
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Description Tomas Hoger 2012-01-18 09:12:10 EST
Quoting upstream advisory:

  http://www.openssl.org/news/secadv_20120118.txt

  A flaw in the fix to CVE-2011-4108 can be exploited in a denial of
  service attack. Only DTLS applications using OpenSSL 1.0.0f and
  0.9.8s are affected.

The fix for CVE-2011-4108 (bug #771770) introduced a regression that can allow remote attacker to crash DTLS servers using affected OpenSSL version because of an out-of-bounds read.  This issue is corrected in OpenSSL 1.0.0g or 0.9.8t.

Upstream fix:
http://cvs.openssl.org/chngview?cn=22032 (0.9.8)
http://cvs.openssl.org/chngview?cn=22037 (1.0.0)
Comment 1 Tomas Hoger 2012-01-19 08:00:53 EST
As openssl updates for Red Hat Enterprise Linux addressing CVE-2011-4108 have not been released yet, no released openssl version in Red Hat Enterprise Linux is affected by this flaw.  Future updates will use corrected CVE-2011-4108 fix that does not introduce this problem.

openssl packages versions in Red Hat Enterprise Linux 3 and 4 do not have DTLS support and hence can not be affected by this issue or CVE-2011-4108.

Statement:

Not vulnerable. This issue did not affect the versions of openssl as shipped with Red Hat Enterprise Linux 3, 4, 5, and 6.
Comment 2 Tomas Hoger 2012-01-19 08:01:44 EST
Created openssl tracking bugs for this issue

Affects: fedora-all [bug 783122]
Comment 3 Fedora Update System 2012-01-22 00:27:08 EST
openssl-1.0.0g-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 4 Fedora Update System 2012-01-24 02:55:29 EST
openssl-1.0.0g-1.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.

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