RHEL 2.1 : openssl (RHSA-2003:102)

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Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated OpenSSL packages are available that fix a potential
timing-based attack and a modified Bleichenbacher attack.

[Updated 30 May 2003] Added missing i686 packages.

OpenSSL is a commercial-grade, full-featured, open source toolkit that
implements the Secure Sockets Layer (SSL v2/v3) and Transport Layer
Security (TLS v1) protocols, and provides a full-strength general
purpose cryptography library.

Researchers discovered a timing attack on RSA keys. Applications
making use of OpenSSL are generally vulnerable to such an attack,
unless RSA blinding has been turned on. OpenSSL does not use RSA
blinding by default and most applications do not enable RSA blinding.

A local or remote attacker could use this attack to obtain the
server's private key by determining factors using timing differences
on (1) the number of extra reductions during Montgomery reduction, and
(2) the use of different integer multiplication algorithms (Karatsuba
and normal).

In order for an attack to be sucessful, an attacker must have good
network conditions that allow small changes in timing to be reliably
observed.

Additionally, the SSL and TLS components for OpenSSL allow remote
attackers to perform an unauthorized RSA private key operation via a
modified Bleichenbacher attack. This attack (also known as the
Klima-Pokorny-Rosa attack) uses a large number of SSL or TLS
connections using PKCS #1 v1.5 padding to cause OpenSSL to leak
information regarding the relationship between ciphertext and the
associated plaintext.

These erratum packages contain a patch provided by the OpenSSL group
that enables RSA blinding by default, and protects against the
Klima-Pokorny-Rosa attack.

Because server applications are affected by these vulnerabilities, we
advise users to restart all services that use OpenSSL functionality
or, alternatively, reboot their systems after installing these
updates.

See also :

https://www.redhat.com/security/data/cve/CVE-2003-0131.html
https://www.redhat.com/security/data/cve/CVE-2003-0147.html
http://crypto.stanford.edu/~dabo/papers/ssl-timing.pdf
http://eprint.iacr.org/2003/052/
http://rhn.redhat.com/errata/RHSA-2003-102.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)

Family: Red Hat Local Security Checks

Nessus Plugin ID: 12380 ()

Bugtraq ID:

CVE ID: CVE-2003-0131
CVE-2003-0147