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Windows Applications Insecure Library Loading

The Official, Verified Secunia List:
http://secunia.com/advisories/windows_insecure_library_loading/

The list is continuously updated as we confirm the vulnerability reports so check back regularly too see if any of your apps are affected.


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TITLE:
Microsoft ASP.NET Cryptographic Padding Information Disclosure

SECUNIA ADVISORY ID:
SA41409

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/41409/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=41409

RELEASE DATE:
2010-09-21

DISCUSS ADVISORY:
http://secunia.com/advisories/41409/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/41409/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=41409

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A vulnerability has been reported in Microsoft .NET Framework, which
can be exploited by malicious people to disclose sensitive
information.

The vulnerability is caused due to an error within ASP.NET in the
handling of cryptographic padding when using encryption in CBC mode.
This can be exploited to decrypt data, e.g. the View State, via
returned error codes from an affected server.

Successful exploitation further allows tampering with encrypted data
and e.g. downloading arbitrary files from affected systems running
ASP.Net 3.5 SP1 or above.

The vulnerability is reported in Microsoft .NET Framework 1.0 SP3
through Microsoft .NET Framework 4.0.

SOLUTION:
The vendor recommends enabling ASP.NET custom errors and map all
error codes to the same error page to block known attack vectors
(please see the vendor's advisory for details).

PROVIDED AND/OR DISCOVERED BY:
Juliano Rizzo

ORIGINAL ADVISORY:
Microsoft:
http://www.microsoft.com/technet/security/advisory/2416728.mspx
http://blogs.technet.com/b/srd/archive/2010/09/17/understanding-the-asp-net-vulnerability.aspx

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
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