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Highly critical

Opera Buffer Overflow and Information Disclosure

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Release Date:  2010-03-04    Last Update:  2010-04-21    Views:  33,330

Secunia Advisory SA38820

Where:

From remote

Impact:

Exposure of sensitive information, System access

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


Some vulnerabilities have been reported in Opera, which can be exploited by malicious people to disclose sensitive information or compromise a user's system.

1) An error exists when processing HTTP responses having a malformed "Content-Length" header. This can be exploited to cause a heap-based buffer overflow via an overly large 64-bit "Content-Length" value, having the higher 32-bit part negative.

Successful exploitation may allow execution of arbitrary code.

The vulnerability is confirmed in version 10.50 for Windows. Prior versions may also be affected.

2) An error when parsing XSLT constructs can be exploited to disclose cached content from previously visited web pages.

The vulnerability is reported in versions prior to 10.51.


Solution:
Update to version 10.51.

Provided and/or discovered by:
1) Marcin Ressel (~echo). Additional information provided by Secunia Research.
2) The vendor credits crazypops.

Original Advisory:
Opera:
http://www.opera.com/support/kb/view/948/
http://www.opera.com/support/kb/view/949/

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 Buffer Overflow and Information Disclosure

User Message
highstream RE: Opera "Content-Length" Processing Buffer Overflow Vulnerability
Member 5th Mar, 2010 17:56
Score: 6
Posts: 29
User Since: 19th Dec 2007
System Score: N/A
Location: N/A
Last edited on 5th Mar, 2010 18:05
On its forums, Opera is claiming that the vulnerability is not exploitable and that the report is invalid. See http://my.opera.com/community/forums/topic.dml?id=... and http://my.opera.com/community/forums/topic.dml?id=...
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blog.psi2.de RE: Opera "Content-Length" Processing Buffer Overflow Vulnerability
Member 6th Mar, 2010 08:53
Score: 5
Posts: 4
User Since: 6th Mar 2010
System Score: N/A
Location: DE
Last edited on 6th Mar, 2010 08:53
"In our testing, DEP mitigates the problem and should protect the system," Opera spokesman Thomas Ford said at The Register:
http://www.theregister.co.uk/2010/03/05/opera_vuln...

--
Visit my Security-Blog:
http://blog.psi2.de/en (English) or
http://blog.psi2.de (German)
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SOwingSadness

RE: Opera "Content-Length" Processing Buffer Overflow Vulnerability
[+]
This reply has been minimised due to a negative Relevancy Score.

SOwingSadness

RE: Opera "Content-Length" Processing Buffer Overflow Vulnerability
[+]
This reply has been minimised due to a negative Relevancy Score.

SOwingSadness

RE: Opera "Content-Length" Processing Buffer Overflow Vulnerability
[+]
This reply has been minimised due to a negative Relevancy Score.
highstream RE: Opera "Content-Length" Processing Buffer Overflow Vulnerability
Member 12th Mar, 2010 00:22
Score: 6
Posts: 29
User Since: 19th Dec 2007
System Score: N/A
Location: N/A
For Opera's statement on 3/11 about this, see http://my.opera.com/securitygroup/blog/2010/03/09/...
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