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TITLE:
ASP.NET RCP/encoded Mode Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA16005

VERIFY ADVISORY:
http://secunia.com/advisories/16005/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Microsoft .NET Framework 1.x
http://secunia.com/product/667/
ASP.NET 1.x
http://secunia.com/product/2173/

DESCRIPTION:
SPI Labs has reported a vulnerability in ASP.NET, which can be
exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an input validation error in the
"System.Xml.Serialization.Xml.XmlSerializationReader.ReadReferencedElements()"
function. This can be exploited to cause an infinite loop and consume
a large amount of CPU resources on a vulnerable system by sending a
specially crafted SOAP message to a RCP/encoded web method, which
takes an array as input.

SOLUTION:
Use the document/literal mode for web services handling input from
untrusted sources.

The vulnerability will reportedly be fixed in an upcoming release.

PROVIDED AND/OR DISCOVERED BY:
Bryan Sullivan and Sacha Faust, SPI Labs.

ORIGINAL ADVISORY:
SPI Labs:
http://www.spidynamics.com/spilabs/advisories/aspRCP.html

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About:
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