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Insecure Library Loading
Moderately critical

Opera Long Filename Extension Buffer Overflows

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Release Date:  2003-04-29    Last Update:  2003-05-12    Views:  20,548

Secunia Advisory SA8691

Where:

From remote

Impact:

DoS

Solution Status:

Vendor Patch

CVE Reference(s):

No CVE references.

Description


Two vulnerabilities have been discovered in the Opera browser, which can be exploited by a malicious person to cause a DoS (Denial of Service) on a user's browser.

Both vulnerabilities are caused due to boundary errors in the handling of filename extensions and can be exploited by a malicious person by constructing a special HTML document, which will make the browser try to download a file with a long filename extension.

The first vulnerability will automatically cause a heap overflow overwriting arbitrary content with the user input converted to 16-bit wide chars.

The second vulnerability will display a download dialog box. If the user agrees to save the file, a stack overflow will be triggered overwriting certain registers (EBP and EIP) with the user input converted to 16-bit wide chars.

It may be possible to exploit the vulnerabilities to compromise a user's system. However, this has not been proven during research.


Solution:
Opera Software has released Opera version 7.11 for Windows, which fixes the vulnerabilities. Opera version 7.11 beta 2 for Linux will also be officially released soon.

Further details available to Secunia VIM customers

Provided and/or discovered by:
1) Discovered by Jakob Balle, Secunia.

2) The vulnerability was discovered by two different parties around the same time. While Jakob Balle from Secunia was working with the vendor to fix the vulnerability, it was discovered and disclosed on public mailing lists by nesumin before Opera Software had a chance to react.

Original Advisory:
http://secunia.com/secunia_research/2003-4/

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Opera Long Filename Extension Buffer Overflows

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