Daniel Ahlberg
24/03/03, 18:35
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Hash: SHA1
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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
- - ---------------------------------------------------------------------
aliz@gentoo.org - GnuPG key is available at http://cvs.gentoo.org/~aliz
- - ---------------------------------------------------------------------
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Hash: SHA1
- - ---------------------------------------------------------------------
GENTOO LINUX SECURITY ANNOUNCEMENT 200303-20
- - ---------------------------------------------------------------------
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
- - ---------------------------------------------------------------------
- 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
- - ---------------------------------------------------------------------
aliz@gentoo.org - GnuPG key is available at http://cvs.gentoo.org/~aliz
- - ---------------------------------------------------------------------
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