[CLA-2003:751] Conectiva Security Announcement - openssl

From: Conectiva Updates (secure_at_conectiva.com.br)
Date: 09/30/03

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Date: Tue, 30 Sep 2003 18:44:32 -0300
To: conectiva-updates@papaleguas.conectiva.com.br, lwn@lwn.net, bugtraq@securityfocus.com, security-alerts@linuxsecurity.com, linsec@lists.seifried.org

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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : openssl
SUMMARY : Remote vulnerabilities
DATE : 2003-09-30 18:40:00
ID : CLA-2003:751
RELEVANT
RELEASES : 7.0, 8, 9

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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.

NISCC[2] developed a test suit to verify the behavior of SSL and TLS
implementations when presented with malformed client certificates. As
a result of this test, the following vulnerabilities[3,4] were found
in the OpenSSL implementation:

- Vulnerabilities in the handling of malformed ASN.1 tags
(CAN-2003-0543[5] and CAN-2003-0544[6]). Because of a flaw in the
handling of ASN.1 tag values, an out-of-bounds read can be triggered
in some situations. A remote attacker can exploit these
vulnerabilities to cause a denial of service condition.

- Stack corruption in the handling of rejected ASN.1 encodings
(CAN-2003-0545[7]). A remote attacker may exploit this vulnerability
to cause a denial of service condition and potentially execute
arbitrary code. This vulnerability does not affect the OpenSSL
versions distributed with Conectiva Linux 7.0 and 8 (OpenSSL-0.9.6).

Additionally, this update includes fixes for a bug which causes
OpenSSL to parse a client certificate when it should reject it as a
protocol error.

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.niscc.gov.uk/aboutniscc/index.htm
3.http://www.uniras.gov.uk/vuls/2003/006489/openssl.htm
4.http://www.openssl.org/news/secadv_20030930.txt
5.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0543
6.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0544
7.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0545

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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