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Gentoo: openssl buffer overflow vulnerability Print E-mail
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Posted by Team   
Gentoo Researchers have discovered a timing attack on RSA keys, to which OpenSSL is generally vulnerable, unless RSA blinding has been turned on.

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

          PACKAGE : openssl
          SUMMARY : timing based attack
             DATE : 2003-03-20 09:20 UTC
          EXPLOIT : remote
    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

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

Read the full advisory at


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

- - --------------------------------------------------------------------- - GnuPG key is available at
- - ---------------------------------------------------------------------

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