Forum Thread: Opera "Content-Length" Processing Buffer Overflow Vulnerability

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Opera "Content-Length" Processing Buffer Overflow Vulnerability

Secunia Opera "Content-Length" Processing Buffer Overflow Vulnerability
Secunia Official 5th Mar, 2010 17:56
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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.

highstream RE: Opera "Content-Length" Processing Buffer Overflow Vulnerability
Member 5th Mar, 2010 17:56
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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
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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...

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Visit my Security-Blog:
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SOwingSadness

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highstream RE: Opera "Content-Length" Processing Buffer Overflow Vulnerability
Member 12th Mar, 2010 00:22
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For Opera's statement on 3/11 about this, see http://my.opera.com/securitygroup/blog/2010/03/09/...
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