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xine Buffer Overflow in pnm_get_chunk() Lets Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1012648 |
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SecurityTracker URL: http://securitytracker.com/id/1012648
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CVE Reference:
CAN-2004-1187, CAN-2004-1188
(Links to External Site)
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Date: Dec 21 2004
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Impact:
Execution of arbitrary code via network, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): prior to 0.99.3
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Description:
Some vulnerabilities were reported in xine. A remote user may be able to execute arbitrary code on the target user's system.
iDEFENSE reported that there is a buffer overflow in pnm_get_chunk() in the processing of the RMF_TAG, DATA_TAG, PROP_TAG, MDPR_TAG, and CONT_TAG parameters [CVE: CAN-2004-1188] and the PNA_TAG parameter [CVE: CAN-2004-1187]. A remote user can create a 'pnm://' URL that, when loaded by the target user, will cause xine to connect to a malicious server and load a specially crafted PNM file to trigger the overflow. Arbitrary code can be executed with the privileges of the target user.
The vendor was notified on December 10, 2004.
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Impact:
A remote user can cause arbitrary code to be executed on the target user's computer when a specially crafted PNM file is processed by the target user. The code will run with the privileges of the target user.
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Solution:
The vendor has issued a fixed version of xine-lib (1-rc8), available at:
http://xinehq.de/index.php/releases
A patch is also available at:
http://cvs.sourceforge.net/viewcvs.py/xine/xine-lib/src/input/pnm.c?r1=1.20&r2=1.21
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Vendor URL: www.xinehq.de/ (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
Linux (Any), UNIX (Any)
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Message History:
None.
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Source Message Contents
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Date: Tue, 21 Dec 2004 18:17:40 -0500
Subject: [none]
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Multiple Vendor Xine 0.99.2 PNM Handler Negative Read Length Overflow Vulnerability
iDEFENSE Security Advisory 12.21.04:
I. BACKGROUND
Xine is a multimedia player which runs on multiple platforms.
More information is available at:
http://xinehq.de/
II. DESCRIPTION
Remote exploitation of a buffer overflow in version 0.99.2 of xine could
allow execution of arbitrary code.
The vulnerability specifically exists in the RMF_TAG, DATA_TAG,
PROP_TAG, MDPR_TAG and CONT_TAG handling code of the pnm_get_chunk()
function. These tags are all handled by the same code. The code does not
perform correct checking on the chunk size before reading data in. If
the size given is less than the PREAMBLE_SIZE, a negative length read is
made into a fixed length buffer. Because the read length parameter is an
unsigned value, the negative length is interpreted as a very large
length, allowing a buffer overflow to occur.
III. ANALYSIS
Exploitation of this vulnerability allows execution of arbitrary code
with the privileges of the targeted user.
In order to exploit this vulnerability, an attacker would have to
convince the targeted user to open a connection to a malicious PNM
server with xine, using a pnm://address/ URL. Depending on configuration
options, this may be exploitable simply by clicking on a link, or it may
require the user to launch the application, specifically requesting the
malicious content.
IV. DETECTION
iDEFENSE Labs has confirmed the existence of this vulnerability in xine
version 0.99.2. It is suspected that earlier versions of xine also
contain this vulnerability.
This vulnerability also affects MPlayer prior to MPlayer 1.0pre5try2.
V. WORKAROUND
iDEFENSE is currently unaware of any effective workarounds for this
issue.
VI. VENDOR RESPONSE
xine-lib 1-rc8 was released to address this vulnerability and is
available for download at:
http://xinehq.de/index.php/releases
An xine patch for this vulnerability is available at:
http://cvs.sourceforge.net/viewcvs.py/xine/xine-lib/src/input/pnm.c?r1=1.20&r2=1.21
An MPlayer patch for this vulnerability is available at:
http://www.mplayerhq.hu/MPlayer/patches/pnm_fix_20041215.diff
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
names CAN-2004-1188 to these issues. This is a candidate for inclusion
in the CVE list (http://cve.mitre.org), which standardizes names for
security problems.
VIII. DISCLOSURE TIMELINE
12/10/2004 Initial vendor notification
12/11/2004 Initial vendor response
12/21/2004 Public disclosure
IX. CREDIT
The discoverer of this vulnerability wishes to remain anonymous.
Get paid for vulnerability research
http://www.idefense.com/poi/teams/vcp.jsp
X. LEGAL NOTICES
Copyright © 2004 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@idefense.com 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.
-----
Multiple Vendor Xine 0.99.2 PNM Handler PNA_TAG Heap Overflow Vulnerability
iDEFENSE Security Advisory 12.21.04:
I. BACKGROUND
Xine is a multimedia player which runs on multiple platforms.
More information is available at:
http://xinehq.de/
II. DESCRIPTION
Remote exploitation of a buffer overflow in version 0.99.2 of xine could
allow execution of arbitrary code.
The vulnerability specifically exists in the PNA_TAG handling code of
the pnm_get_chunk() function. The function does not check the if the
length of an input to be stored in a fixed size buffer is larger than
the buffer size.
III. ANALYSIS
Exploitation of this vulnerability allows execution of arbitrary code
with the privileges of the targeted user.
In order to exploit this vulnerability, an attacker would have to
convince the targeted user to open a connection to a malicious PNM
server with xine, using a pnm://address/ URL. Depending on configuration
options, this may be exploitable simply by clicking on a link, or it may
require the user to launch the application, specifically requesting the
malicious content.
IV. DETECTION
iDEFENSE Labs has confirmed the existence of this vulnerability in xine
version 0.99.2. It is suspected that earlier versions of xine also
contain this vulnerability.
This vulnerability also affects MPlayer prior to MPlayer 1.0pre5try2.
V. WORKAROUND
iDEFENSE is currently unaware of any effective workarounds for this
issue.
VI. VENDOR RESPONSE
xine-lib 1-rc8 was released to address this vulnerability and is
available for download at:
http://xinehq.de/index.php/releases
An xine patch for this vulnerability is available at:
http://cvs.sourceforge.net/viewcvs.py/xine/xine-lib/src/input/pnm.c?r1=1.20&r2=1.21
An MPlayer patch for this vulnerability is available at:
http://www.mplayerhq.hu/MPlayer/patches/pnm_fix_20041215.diff
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
names CAN-2004-1187 to these issues. This is a candidate for inclusion
in the CVE list (http://cve.mitre.org), which standardizes names for
security problems.
VIII. DISCLOSURE TIMELINE
12/10/2004 Initial vendor notification
12/11/2004 Initial vendor response
12/21/2004 Public disclosure
IX. CREDIT
The discoverer of this vulnerability wishes to remain anonymous.
Get paid for vulnerability research
http://www.idefense.com/poi/teams/vcp.jsp
X. LEGAL NOTICES
Copyright © 2004 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@idefense.com 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.
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