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AUSCERT External Security Bulletin Redistribution
ESB-2013.0161
OpenSSL Security Advisory [05 Feb 2013]
6 February 2013
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AusCERT Security Bulletin Summary
---------------------------------
Product: OpenSSL
Publisher: OpenSSL
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2013-0169 CVE-2013-0166 CVE-2012-2686
Original Bulletin:
http://www.openssl.org/news/secadv_20130204.txt
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OpenSSL Security Advisory [05 Feb 2013]
========================================
SSL, TLS and DTLS Plaintext Recovery Attack (CVE-2013-0169)
============================================================
Nadhem Alfardan and Kenny Paterson have discovered a weakness in the handling
of CBC ciphersuites in SSL, TLS and DTLS. Their attack exploits timing
differences arising during MAC processing. Details of this attack can be found
at: http://www.isg.rhul.ac.uk/tls/
All versions of OpenSSL are affected including 1.0.1c, 1.0.0j and 0.9.8x
Note: this vulnerability is only partially mitigated when OpenSSL is used in
conjuction with the OpenSSL FIPS Object Module and the FIPS mode of operation
is enabled.
Thanks go to Nadhem J. AlFardan and Kenneth G. Paterson of the Information
Security Group Royal Holloway, University of London for discovering this flaw.
An initial fix was prepared by Adam Langley <agl@chromium.org> and Emilia
Ksper <ekasper@google.com> of Google. Additional refinements were added by Ben
Laurie, Andy Polyakov and Stephen Henson of the OpenSSL group.
Affected users should upgrade to OpenSSL 1.0.1d, 1.0.0k or 0.9.8y
TLS 1.1 and 1.2 AES-NI crash (CVE-2012-2686)
=============================================
A flaw in the OpenSSL handling of CBC ciphersuites in TLS 1.1 and TLS 1.2 on
AES-NI supporting platforms can be exploited in a DoS attack. If you are
unsure if you are using AES-NI see "References" below.
Anyone using an AES-NI platform for TLS 1.2 or TLS 1.1 on OpenSSL 1.0.1c is
affected. Platforms which do not support AES-NI or versions of OpenSSL which
do not implement TLS 1.2 or 1.1 (for example OpenSSL 0.9.8 and 1.0.0) are not
affected.
Thanks go to Adam Langley <agl@chromium.org> for initially discovering the bug
and developing a fix and to Wolfgang Ettlingers <wolfgang.ettlinger@gmail.com>
for independently discovering this issue.
Affected users should upgrade to OpenSSL 1.0.1d
OCSP invalid key DoS issue (CVE-2013-0166)
============================================
A flaw in the OpenSSL handling of OCSP response verification can be
exploitedin a denial of service attack.
All versions of OpenSSL are affected including 1.0.1c, 1.0.0j and 0.9.8x
This flaw was discovered and fixed by Stephen Henson of the OpenSSL core team.
Affected users should upgrade to OpenSSL 1.0.1d, 1.0.0k or 0.9.8y.
References
==========
URL for this Security Advisory:
http://www.openssl.org/news/secadv_20130204.txt Wikipedia AES-NI description:
http://en.wikipedia.org/wiki/AES-NI
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