Bug 86112 - New timing attack on OpenSSL applications
New timing attack on OpenSSL applications
Status: CLOSED ERRATA
Product: Red Hat Linux
Classification: Retired
Component: openssl (Show other bugs)
8.0
All Linux
medium Severity medium
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Assigned To: Nalin Dahyabhai
: Security
Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2003-03-14 04:44 EST by Mark J. Cox (Product Security)
Modified: 2007-04-18 12:52 EDT (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2003-04-15 07:32:24 EDT
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Description Mark J. Cox (Product Security) 2003-03-14 04:44:43 EST
Description of problem:

Timing attack on RSA decryption because RSA blinding isn't
used in all applications (mod_ssl etc)

Version-Release number of selected component (if applicable):

This affects most applications that link to OpenSSL

How reproducible:

In order to exploit this issue you need to be local to the machine or be on a
network that enables you to reliably observe sub 1ms timing differences.  

Additional info:

http://crypto.stanford.edu/~dabo/papers/ssl-timing.pdf

Note that enabling RSA blinding is not trivial
Comment 1 Mark J. Cox (Product Security) 2003-03-14 04:45:56 EST
(also note that this issue was entered for OpenSSL under Red Hat Linux 8.0 but
applies to all applications linked to OpenSSL under Red Hat Linux 6.2, 7, 7.1,
7.2, 8.0 and the Enterprise Linux family.
Comment 2 Mark J. Cox (Product Security) 2003-03-17 04:36:20 EST
This is CAN-2003-0147.  The OpenSSL team are currently working on a patch that
enables RSA blinding by default, therefore only OpenSSL will need to be updated
and applications linked to it will not.
Comment 3 Mark J. Cox (Product Security) 2003-04-15 07:32:24 EDT
Was fixed by http://rhn.redhat.com/errata/RHSA-2003-101.html

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