Tue Mar 18 21:27:00 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 a vulnerability of the RSA encryption.
The official security advisory follows:
OpenSSL v0.9.7a and 0.9.6i vulnerability
Researchers have discovered a timing attack on RSA keys, to which
OpenSSL is generally vulnerable, unless RSA blinding has been turned
Typically, it will not have been, because it is not easily possible to
do so when using OpenSSL to provide SSL or TLS.
The enclosed patch switches blinding on by default. Applications that
wish to can remove the blinding with RSA_blinding_off(), but this is
not generally advised. It is also possible to disable it completely by
defining OPENSSL_NO_FORCE_RSA_BLINDING at compile-time.
The performance impact of blinding appears to be small (a few
This problem affects many applications using OpenSSL, in particular,
almost all SSL-enabled Apaches. You should rebuild and reinstall
OpenSSL, and all affected applications.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2003-0147 to this issue.
We strongly advise upgrading OpenSSL in all cases, as a precaution.
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: email@example.com . 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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