Opera is a cross-platform web browser. More information is available
Remote exploitation of a heap overflow vulnerability within version 9 of
Opera Software's Opera Web browser could allow an attacker to execute
arbitrary code on the affected host.
A flaw exists within Opera when parsing a tag that contains a URL. A
heap buffer with a constant size of 256 bytes is allocated to store the
URL, and the tag's URL is copied into this buffer without sufficient
bounds checking of its length. The vulnerable code would look something
like this in C/C++:
char *local_url = malloc(256); strcpy(local_url, tag_url);This URL can be inserted into any tag, such as an iframe. The range of
Successful remote exploitation allows an attacker to execute arbitrary
code with the privileges of the logged in user. A failed exploitation
attempt may result in the browser crashing. The attacker would first
need to construct a website containing the malicious tag and trick the
vulnerable user into visiting the site. This would trigger the
vulnerability and allow the code to execute with the privileges of the
The range of characters available does not make this vulnerability
or large compressed image files the attacker can have nearly complete
control of the heap.
iDefense Labs has confirmed Opera versions 9.0 and 9.01 on both Windows
and Linux are vulnerable. Version 8 is not vulnerable.
iDefense is currently unaware of any effective workarounds for this
Opera has addressed this vulnerability with version 9.02 of the Opera
Web Browser. More information can be found in Opera's advisory at
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2006-4819 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
09/15/2006 Initial vendor notification
09/29/2006 Initial vendor response
10/17/2006 Coordinated public disclosure
The discoverer of this vulnerability wishes to remain anonymous.
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Copyright © 2006 Verisign, Inc.
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