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Home » Hacking News » Connectiva CLA-2003:625: OpenSSL multiple vulnerabilitis

Connectiva CLA-2003:625: OpenSSL multiple vulnerabilitis

by Nikola Strahija on April 14th, 2003 This advisory provides a solution to OpenSSL vulnerabilities recently discovered.


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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : openssl
SUMMARY : OpenSSL library vulnerabilities
DATE : 2003-04-10 17:06:00
ID : CLA-2003:625
RELEVANT
RELEASES : 6.0, 7.0, 8

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DESCRIPTION
OpenSSL[1] implements the Secure Sockets Layer (SSL v2/v3) and
Transport Layer Security (TLS v1) protocols as well as full-strength
general purpose cryptography functions. It is used (as a library) by
several projects, like Apache, OpenSSH, Bind, OpenLDAP and many
others clients and servers programs.

This OpenSSL update addresses the issues outlined below:

1) Klima-Pokorny-Rosa attack (CAN-2003-0131)[2][3]
Vlastimil Klima, Ondrej Pokorny and Tomas Rosa published[6] a paper
where they present an extension to the Bleichenbacher attack
on RSA with PKCS #1 v1.5 padding as used in SSL 3.0 and TLS 1.0. This
vulnerability would allow a remote attacker to perform a single RSA
private key operation on a ciphertext of his/her choice using the
server's RSA key after analysing the server's behaviour with a large
number of specially crafted connections.

2) Timing attack (CAN 2003-147)[4][5]
D. Boneh and D. Brumley published[7] a paper in which they
demonstrate that remote timing attacks are possible and practical
against OpenSSL and derived libraries. They successfully extracted
private keys from a webserver in a local network. In order to prevent
such attacks, a technique known as RSA blinding has been turned on by
default in OpenSSL.

Additionally, some smaller fixes from newer versions of OpenSSL have
been included in the packages provided via this update.


SOLUTION
It is recommended that all users upgrade their openssl packages.

Please note that it is necessary to restart services which use the
library (such as the apache web server with SSL enabled) so that the
new, fixed, version is used. A list of such applications can be
obtained after the upgrade with the following command:

lsof | grep libssl

The first column will contain the name of the application that needs
to be restarted. If there is any doubt about which application has to
be restarted or how to do it, we recommend that the system be
rebooted.


REFERENCES
1. http://www.openssl.org
2. http://www.openssl.org/news/secadv_20030319.txt
3. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0131
4. http://www.openssl.org/news/secadv_20030317.txt
5. http://cve.mitre.org/cgi-bin/cvename.cgi?name=2003-147
6. http://eprint.iacr.org/2003/052/
7. http://crypto.stanford.edu/~dabo/abstracts/ssl-timing.html


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/openssl-0.9.6-4U60_6cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/openssl-0.9.6-4U60_6cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/openssl-devel-0.9.6-4U60_6cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/openssl-0.9.6a-3U70_6cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssl-0.9.6a-3U70_6cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssl-devel-0.9.6a-3U70_6cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssl-devel-static-0.9.6a-3U70_6cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssl-doc-0.9.6a-3U70_6cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssl-progs-0.9.6a-3U70_6cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/openssl-0.9.6c-2U80_5cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/openssl-0.9.6c-2U80_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/openssl-devel-0.9.6c-2U80_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/openssl-devel-static-0.9.6c-2U80_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/openssl-doc-0.9.6c-2U80_5cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/openssl-progs-0.9.6c-2U80_5cl.i386.rpm


ADDITIONAL INSTRUCTIONS
The apt tool can be used to perform RPM packages upgrades:

- run: apt-get update
- after that, execute: apt-get upgrade

Detailed instructions reagarding the use of apt and upgrade examples
can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en

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All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en

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All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

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Copyright (c) 2003 Conectiva Inc.
http://www.conectiva.com

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