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AUSCERT External Security Bulletin Redistribution
CMS and S/MIME Bleichenbacher attack
13 March 2012
AusCERT Security Bulletin Summary
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Reduced Security -- Remote/Unauthenticated
CVE Names: CVE-2012-0884
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OpenSSL Security Advisory [12 Mar 2012]
CMS and S/MIME Bleichenbacher attack (CVE-2012-0884)
A weakness in the OpenSSL CMS and PKCS #7 code can be exploited
using Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
also known as the million message attack (MMA).
Only users of CMS, PKCS #7, or S/MIME decryption operations are affected. A
successful attack needs on average 2^20 messages. In practice only automated
systems will be affected as humans will not be willing to process this many
SSL/TLS applications are *NOT* affected by this problem since the
SSL/TLS code does not use the PKCS#7 or CMS decryption code.
Thanks to Ivan Nestlerode <firstname.lastname@example.org> for discovering
The fix was developed by Stephen Henson of the OpenSSL core team.
Affected users should upgrade to OpenSSL 1.0.0h or 0.9.8u.
URL for this Security Advisory:
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