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Home » Hacking News » Gentoo 200303-20: OpenSSL vulnerability

Gentoo 200303-20: OpenSSL vulnerability

by Nikola Strahija on March 25th, 2003 A vulnerable server, 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.


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GENTOO LINUX SECURITY ANNOUNCEMENT 200303-20
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PACKAGE : openssl
SUMMARY : Klima-Pokorny-Rosa attack
DATE : 2003-03-24 11:51 UTC
EXPLOIT : remote
VERSIONS AFFECTED : <0.9.6i-r2
FIXED VERSION : >=0.9.6i-r2
CVE : CAN-2003-0131

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- From advisory:

"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."

Read the full advisory at:
http://www.openssl.org/news/secadv_20030319.txt

SOLUTION

It is recommended that all Gentoo Linux users who are running
dev-libs/openssl upgrade to openssl-0.9.6i-r2 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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