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

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

- - ---------------------------------------------------------------------
aliz@gentoo.org - GnuPG key is available at  http://cvs.gentoo.org/~aliz
- - ---------------------------------------------------------------------

 
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