OpenSSL DSA Signing Constant Timing Bug May Let Remote Users Obtain Potentially Sensitive Information on the Target System
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SecurityTracker Alert ID: 1036054 |
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SecurityTracker URL: http://securitytracker.com/id/1036054
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CVE Reference:
CVE-2016-2178
(Links to External Site)
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Date: Jun 8 2016
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Impact:
Disclosure of authentication information, Disclosure of system information
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Fix Available: Yes Vendor Confirmed: Yes
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Description:
A vulnerability was reported in OpenSSL. A remote user can obtain potentially sensitive information on the target system.
The DSA signing algorithm may fail to run in constant time when the BN_FLG_CONSTTIME flag is set. A remote user may be able to exploit this to obtain potentially sensitive timing information regarding the cryptographic signature process, including the DSA private key.
The original advisory is available at:
http://eprint.iacr.org/2016/594.pdf
Cesar Pereida (Aalto University), Billy Brumley (Tampere University of Technology), and Yuval Yarom (The University of Adelaide and NICTA) reported this vulnerability.
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Impact:
A remote user can obtain potentially sensitive timing information regarding the cryptographic signature process, including the DSA private key.
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Solution:
The vendor has issued a source code fix, available at:
https://git.openssl.org/?p=openssl.git;a=commit;h=399944622df7bd81af62e67ea967c470534090e2
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Vendor URL: openssl.org/ (Links to External Site)
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Cause:
State 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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Source Message Contents
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[Original Message Not Available for Viewing]
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