RealNetworks RealPlayer/HelixPlayer RealPix Format String Vulnerability
iDEFENSE Security Advisory 09.30.05
www.idefense.com/application/poi/display?id=311&type=vulnerabilities
September 30, 2005
I. BACKGROUND
RealPlayer is an application for playing various media formats,
developed by RealNetworks Inc. For more information, visit
http://www.real.com/.
II. DESCRIPTION
Remote exploitation of a format string vulnerability in RealPix (.rp)
file format parser within various versions of RealNetworks Inc.'s
RealPlayer could allow attackers to execute arbitrary code.
The vulnerability specifically exists because of the improper usage of a
formatted printing function. When a user specifies an invalid value for
the "timeformat" attribute describing a RealPix file, the data is passed
to the function.
The following stripped down .rp file is sufficient enough to trigger the
vulnerability:
<imfl>
<head
title="iDEFENSE Labs RealPix Vulnerability"
timeformat="%n%n%n%n%n%n"/>
</imfl>
III. ANALYSIS
Exploitation allows for arbitrary code execution as the user who opened
the .rp file.
Exploitation requires an attacker to craft a malicious .rp file and
convince a user to open it. An attacker could also trick a user to load
the .rp file from a normal web page under the attacker's control; this
is possible if the user has configured their web browser to handle
RealPlayer formats automatically.
IV. DETECTION
iDEFENSE Labs has confirmed that RealPlayer 10.0.4.750 on Linux is
vulnerable. Windows and Mac versions of RealPlayer are not vulnerable.
FreeBSD versions are suspected vulnerable.
The vendor has indicated that the following versions are vulnerable:
Linux RealPlayer 10 (10.0.0 - 10.0.5)
Helix Player (10.0.0 - 10.0.5)
The following vendors include susceptible RealPlayer packages within
their respective distributions:
The FreeBSD Project: FreeBSD 5.3 and earlier
Novell Inc.: SuSE Linux 9.2
Red Hat Inc.: Desktop v.3 and v.4,
Enterprise Linux AS/ES/WS v.3 and v.4 and Fedora Core 3,
Linux 7.3 and 9
V. WORKAROUND
Filter .rp attachments at e-mail gateways. Educate users about the risks
of accepting files from untrusted individuals.
VI. VENDOR RESPONSE
The vendor had released the following advisory for this vulnerability:
http://service.real.com/help/faq/security/050930_player/EN/
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2005-2710 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
security problems.
VIII. DISCLOSURE TIMELINE
08/23/2005 Initial vendor notification
09/02/2005 Initial vendor response
09/30/2005 Coordinated public disclosure
IX. CREDIT
iDEFENSE Labs is credited with this discovery.
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X. LEGAL NOTICES
Copyright (c) 2005 iDEFENSE, Inc.
Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDEFENSE. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically, please
email customerservice (at) idefense (dot) com [email concealed] for permission.
Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on,
this information.
