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OpenSSL retrieval of premaster-secret
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Secunia Advisory:
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SA8360
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Release Date:
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2003-03-21
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Last Update:
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2003-04-11
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Popularity:
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10,830 views
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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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Instant alerts on relevant vulnerabilities 
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| CVE reference: | CVE-2003-0131
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Description:
OpenSSL has been found vulnerable to a new attack that allows malicious people to retrieve the premaster-secret, which can be used to identify the session keys used during SSL/TLS sessions. This makes it possible to decrypt the sessions. The premaster-secret is not the same as the RSA secret.
After the Bleichenbacher attack in 1998 it was decided to implement certain counter measures including a version number check in the SSL protocol. However, the version number check was badly implemented and leaks information that makes this new attack method feasible.
The attack method has been proven efficient and feasible over highspeed connections, this attack requires a few million requests to be sent to the server.
For further details please read "Original Advisory".
Solution:
Upgrade to version 0.9.7b:
http://www.openssl.org/source/openssl-0.9.7b.tar.gz
Provided and/or discovered by:
Vlastimil Klima and Ondrej Pokorny and Tomas Rosa
Changelog:
2003-04-11: Updated version of OpenSSL released.
Original Advisory:
http://eprint.iacr.org/2003/052/
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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