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OpenSSL RSA blinding attack
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Secunia Advisory:
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SA8330
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Release Date:
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2003-03-19
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Last Update:
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2003-04-11
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Critical:
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Less critical
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Impact:
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Exposure of sensitive information
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | OpenSSL 0.9.x
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| | CVE reference: | CVE-2003-0147 (Secunia mirror)
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Description:
OpenSSL has been found vulnerable to a timing attack, which has been proven to be a feasible way to recover the RSA secret from systems running OpenSSL.
The problem is that various queries takes different amounts of processing time, this information can be used to guess the private key.
The attacks has been proven feasible over LANs and high speed internet connections. It is required that the load on the server is low and that the network load is low so that an attacker can measure the time differences.
This attack only requires 300.000 to 1.400.000 queries to the ssl server.
Solution:
Upgrade to version 0.9.7b:
http://www.openssl.org/source/openssl-0.9.7b.tar.gz
If RSA blinding is on, you are not vulnerable.
Provided and/or discovered by:
D. Boneh and D. Brumley
Changelog:
2003-04-11: Updated version of OpenSSL released.
Original Advisory:
http://crypto.stanford.edu/~dabo/abstracts/ssl-timing.html
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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