Xine is a multimedia player which runs on multiple platforms.
More information is available at:
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.
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
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.
iDEFENSE is currently unaware of any effective workarounds for this
xine-lib 1-rc8 was released to address this vulnerability and is
available for download at:
An xine patch for this vulnerability is available at:
An MPlayer patch for this vulnerability is available at:
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
12/10/2004 Initial vendor notification
12/11/2004 Initial vendor response
12/21/2004 Public disclosure
The discoverer of this vulnerability wishes to remain anonymous.
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Copyright © 2004 Verisign, Inc.
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