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Category:   Application (Web Server/CGI)  >   Opera Vendors:   Opera Software
Opera BitTorrent Processing Bug Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1018431
SecurityTracker URL:
CVE Reference:   CVE-2007-3929   (Links to External Site)
Updated:  Apr 24 2008
Original Entry Date:  Jul 19 2007
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 9.2, 9.21
Description:   A vulnerability was reported in Opera. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create a BitTorrent with a specially crafted header that, when loaded by the target user via Opera and then subsequently removed from the download pane, will dereference an invalid pointer and potentially execute arbitrary code on the target user's system. The code will run with the privileges of the target user.

The vendor was notified on June 6, 2007.

enhalos reported this vulnerability to iDefense.

Impact:   A remote user can create a file that, when processed by the target user, will execute arbitrary code on the target user's system.
Solution:   The vendor has issued a fixed version (9.22).

The Opera advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any), UNIX (FreeBSD), UNIX (macOS/OS X), UNIX (Solaris - SunOS), Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  iDefense Security Advisory 07.19.07: Opera Software Opera Web Browser

Opera Software Opera Web Browser BitTorrent Dangling Pointer Vulnerability

iDefense Security Advisory 07.19.07
Jul 19, 2007


Opera is a cross-platform web browser. More information is available at


Remote exploitation of a dangling pointer vulnerability in Opera
Software ASA's Opera web browser could allow an attacker to execute
arbitrary code with the privileges of the logged in user.

Opera 9.2 supports BitTorrent downloads. When parsing a specially
crafted BitTorrent header, Opera uses memory that has already been
freed. This can result in an invalid object pointer being dereferenced,
and may allow for the execution of arbitrary code.  The vulnerability is
triggered when the user right clicks on the transfer and removes it.


Exploitation of this vulnerability allows an attacker to execute
arbitrary code on the affected host with the privileges of the logged
in user.  

The attacker must persuade a vulnerable user into clicking a link to a
BitTorrent file. The targeted user must subsequently remove the entry
from the download pane. The requirement to remove the torrent is not
considered to be a mitigating factor since it is natural for a user to
attempt to do so when a transfer is not progressing.


iDefense has confirmed the existence of this vulnerability in Opera
version 9.21 on Windows. Previous versions may also be affected.


iDefense is currently unaware of any workarounds for this issue.


Version 9.22 of Opera has been released to address this issue. More
information can be found at the following URL.


A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.


06/06/2007  Initial vendor notification
06/06/2007  Initial vendor response
07/19/2007  Coordinated public disclosure


This vulnerability was reported to iDefense by enhalos.

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