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TITLE:
Opera "Content-Length" Processing Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA38820

VERIFY ADVISORY:
http://secunia.com/advisories/38820/

DESCRIPTION:
Marcin Ressel has discovered a vulnerability in Opera, which can be
exploited by malicious people to compromise a user's system.

The vulnerability is caused due to an error 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. Other
versions may also be affected.

SOLUTION:
Do not browse untrusted websites or follow untrusted links.

PROVIDED AND/OR DISCOVERED BY:
Marcin Ressel (~echo)

Additional information provided by Secunia Research.

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About:
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vulnerabilities.

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Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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