Wed Mar 19 21:05:00 GMT 2003
This package contains the runtime libraries of OpenSSL version 0.9.6i
which are needed to run applications still linked against 0.9.6.
This is a security update. It fixes another vulnerability of the RSA
The official security advisory follows:
Klima-Pokorny-Rosa attack on RSA in SSL/TLS
Czech cryptologists Vlastimil Klima, Ondrej Pokorny, and Tomas Rosa
have come up with an extension of the "Bleichenbacher attack" on RSA
with PKCS #1 v1.5 padding as used in SSL 3.0 and TLS 1.0. Their
attack requires the attacker to open millions of SSL/TLS connections
to the server under attack; the server's behaviour when faced with
specially made-up RSA ciphertexts can reveal information that in
effect allows the attacker to perform a single RSA private key
operation on a ciphertext of its choice using the server's RSA key.
Note that the server's RSA key is not compromised in this attack.
This problem affects all applications using the OpenSSL SSL/TLS library.
OpenSSL releases up to 0.9.6i and 0.9.7a are vulnerable. The enclosed
patch modifies SSL/TLS server behaviour to avoid the vulnerability.
To update your installation, click on the "Install Cygwin now" link on
the http://cygwin.com/ web page. This downloads setup.exe to your
system. Once you've downloaded setup.exe, run it and select "Net"
("Devel" for the openssl-devel package) and then click on the appropriate
field until the above announced version number appears if it is not
If you have questions or comments, please send them to the Cygwin
mailing list at: firstname.lastname@example.org . I would appreciate it if you would
use this mailing list rather than emailing me directly. This includes
ideas and comments about the setup utility or Cygwin in general.
If you want to make a point or ask a question, the Cygwin mailing list
is the appropriate place.
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