OpenSSL CMS/PKCS#7 Padding Attack May Let Remote Users Decrypt Messages
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SecurityTracker Alert ID: 1026788 |
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SecurityTracker URL: http://securitytracker.com/id/1026788
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CVE Reference:
CVE-2012-0884
(Links to External Site)
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Date: Mar 12 2012
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Impact:
Disclosure of user information
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Fix Available: Yes Vendor Confirmed: Yes Exploit Included: Yes
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Version(s): prior to 0.9.8u, 1.0.0h
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Description:
A vulnerability was reported in OpenSSL. A remote user can decrypt messages in certain cases.
A remote user can exploit a flaw in the CMS and PKCS#7 code by conducting an RSA padding attack (similar to the Bleichenbacher PKCS#1 attack and also known as the million message attack (MMA)) to potentially decrypt a message.
The vendor reports that an average of 2^20 messages must be sent by the remote user to the target decryption system to achieve a successful attack.
SSL/TLS applications do not use the CMS, PKCS#7, or S/MIME decryption code and are not affected.
Ivan Nestlerode reported this vulnerability.
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Impact:
A remote user can decrypt a message in certain cases.
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Solution:
The vendor has issued a fix (0.9.8u, 1.0.0h).
The vendor's advisory is available at:
http://www.openssl.org/news/secadv_20120312.txt
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Vendor URL: www.openssl.org/news/secadv_20120312.txt (Links to External Site)
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Cause:
Access control error
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Underlying OS:
Linux (Any), UNIX (Any), Windows (Any)
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Mar 28 2012 |
(Red Hat Issues Fix) OpenSSL CMS/PKCS#7 Padding Attack May Let Remote Users Decrypt Messages
(bugzilla@redhat.com)
Red Hat has issued a fix for Red Hat Enterprise Linux 5 and 6.
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May 3 2012 |
(FreeBSD Issues Fix) OpenSSL CMS/PKCS#7 Padding Attack May Let Remote Users Decrypt Messages
(FreeBSD Security Advisories <security-advisories@freebsd.org>)
FreeBSD has issued a fix for FreeBSD 7.4, 8.1, 8.2, 8.3, and 9.0.
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May 31 2012 |
(FreeBSD Issues Fix) OpenSSL CMS/PKCS#7 Padding Attack May Let Remote Users Decrypt Messages
(FreeBSD Security Advisories <security-advisories@freebsd.org>)
FreeBSD has issued a fix for FreeBSD 7.4, 8.1, 8.2, 8.3, and 9.0.
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Feb 28 2013 |
(IBM Issues Fix for AIX) OpenSSL CMS/PKCS#7 Padding Attack May Let Remote Users Decrypt Messages
IBM has issued a fix for AIX 5.3, 6.1, and 7.1.
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Source Message Contents
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Date: Mon, 12 Mar 2012 21:28:41 +0000
Subject: OpenSSL
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http://www.openssl.org/news/secadv_20120312.txt
CVE-2012-0884
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