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Opera Software Opera Web Browser URL Parsing Heap Overflow
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SUMMARY
Opera is a "cross-platform web browser". 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.
DETAILS
Vulnerable Systems:
* Opera versions 9.0 and 9.01
Immune Systems:
* Opera version 8.0
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
characters that can be used to overflow the buffer is limited.
Vendor response:
Opera has addressed this vulnerability with version 9.02 of the Opera Web
Browser. More information can be found in Opera's advisory at
<http://www.opera.com/support/search/supsearch.dml?index=848>
http://www.opera.com/support/search/supsearch.dml?index=848.
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4819>
CVE-2006-4819
Disclosure Timeline:
09/15/2006 - Initial vendor notification
09/29/2006 - Initial vendor response
10/17/2006 - Coordinated public disclosure
ADDITIONAL INFORMATION
The information has been provided by
<mailto:idlabs-advisories@idefense.com> iDefense Labs Security Advisories.
The original article can be found at:
<http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=424>
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=424
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