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Home » Hacking News » Gentoo 200303-15: OpenSSL RSA timing attacks

Gentoo 200303-15: OpenSSL RSA timing attacks

by Nikola Strahija on March 22nd, 2003 Timing attacks on RSA keys have been discovered, to which OpenSSL is vulnerable, unless RSA blinding has been turned on.


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- - ---------------------------------------------------------------------
GENTOO LINUX SECURITY ANNOUNCEMENT 200303-15
- - ---------------------------------------------------------------------

PACKAGE : openssl
SUMMARY : timing based attack
DATE : 2003-03-20 09:20 UTC
EXPLOIT : remote
VERSIONS AFFECTED : <0.9.6i-r1
FIXED VERSION : >=0.9.6i-r1
CVE : CAN-2003-0147

- - ---------------------------------------------------------------------

- From advisory:

"Researchers have discovered a timing attack on RSA keys, to which
OpenSSL is generally vulnerable, unless RSA blinding has been turned
on.

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
percent)."

Read the full advisory at
http://www.openssl.org/news/secadv_20030317.txt

SOLUTION

It is recommended that all Gentoo Linux users who are running
dev-libs/openssl upgrade to openssl-0.9.6i-r1 as follows:

emerge sync
emerge openssl
emerge clean

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[email protected] - GnuPG key is available at http://cvs.gentoo.org/~aliz
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