Date: 15 May 2009
References: ESB-2009.0474 ESB-2009.0519 ESB-2009.0585 ESB-2009.1095 ESB-2010.0282
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A U S C E R T A L E R T
AL-2009.0040 -- AUSCERT ALERT
[UNIX/Linux]
Cyrus SASL: Execute Arbitrary Code
15 May 2009
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AusCERT Alert Summary
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Product: Cyrus SASL
Publisher: US-CERT
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact: Execute Arbitrary Code/Commands
Denial of Service
Access: Remote/Unauthenticated
CVE Names: CVE-2009-0688
Original Bulletin: http://www.kb.cert.org/vuls/id/238019
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Vulnerability Note VU#238019
Cyrus SASL library buffer overflow vulnerability
Overview
The Cyrus SASL library contains a buffer overflow vulnerability that could
allow an attacker to execute code or cause a vulnerable program to crash.
I. Description
SASL (Simple Authentication and Security Layer) is a method for adding
authentication support to various protocols. SASL is commonly used by
mail servers to request authentication from clients and by clients to
authenticate to servers.
The sasl_encode64() function converts a string into base64. The Cyrus
SASL library contains buffer overflows that occur because of unsafe use
of the sasl_encode64() function.
II. Impact
A remote attacker might be able to execute code, or cause any programs
relying on SASL to crash or be unavailable.
III. Solution
Upgrade
Cyrus SASL 2.1.23 has been released to address this issue. Before
releasing fixed binaries, maintainers are encouraged to review the Cyrus
vendor statement associated with this note.
Systems Affected
Vendor Status Date Notified Date Updated
Conectiva Inc. Unknown 2009-04-28 2009-04-28
Cray Inc. Unknown 2009-04-28 2009-04-28
Cyrus-IMAP Vulnerable 2009-05-13
Debian GNU/Linux Unknown 2009-04-28 2009-04-28
Engarde Secure Linux Unknown 2009-04-28 2009-04-28
Fedora Project Unknown 2009-04-28 2009-04-28
Gentoo Linux Unknown 2009-04-28 2009-04-28
Hewlett-Packard Company Unknown 2009-04-28 2009-04-28
IBM Corporation (zseries) Unknown 2009-04-28 2009-04-28
IBM eServer Unknown 2009-04-28 2009-04-28
Ingrian Networks, Inc. Unknown 2009-04-28 2009-04-28
Mandriva S. A. Unknown 2009-04-28 2009-04-28
MontaVista Software, Inc. Unknown 2009-04-28 2009-04-28
Novell, Inc. Unknown 2009-04-28 2009-04-28
Openwall GNU/*/Linux Unknown 2009-04-28 2009-04-28
Red Hat, Inc. Vulnerable 2009-04-28 2009-05-14
SafeNet Unknown 2009-05-13 2009-05-13
Slackware Linux Inc. Unknown 2009-04-28 2009-04-28
Sun Microsystems, Inc. Vulnerable 2009-04-28 2009-05-14
SUSE Linux Unknown 2009-04-28 2009-04-28
The SCO Group Unknown 2009-04-28 2009-04-28
Turbolinux Unknown 2009-04-28 2009-04-28
Ubuntu Unknown 2009-04-28 2009-04-28
References
ftp://ftp.andrew.cmu.edu/pub/cyrus-mail/cyrus-sasl-2.1.23.tar.gz
http://en.wikipedia.org/w/index.php?title=Base64&oldid=285664115
Credit
Thanks to James Ralston for reporting this issue and providing technical
information.
This document was written by Ryan Giobbi.
Other Information
Date Public: 2009-04-08
Date First Published: 2009-05-14
Date Last Updated: 2009-05-14
CERT Advisory:
CVE-ID(s): CVE-2009-0688
NVD-ID(s): CVE-2009-0688
US-CERT Technical Alerts:
Metric: 4.04
Document Revision: 21
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