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TITLE:
Mono ASP.NET Cryptographic Padding Oracle Information Disclosure

SECUNIA ADVISORY ID:
SA41919

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/41919/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=41919

RELEASE DATE:
2010-10-22

DISCUSS ADVISORY:
http://secunia.com/advisories/41919/#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/41919/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
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https://ca.secunia.com/?page=viewadvisory&vuln_id=41919

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 Mono ASP.NET, which can be
exploited by malicious people to disclose sensitive information.

The vulnerability is caused due to improper error handling within
ASP.NET during cryptographic padding verification with certain
algorithms. This can be exploited to decrypt data, e.g. the View
State, via returned error codes from an affected server.

This is related to:
SA41409

SOLUTION:
Fixed in the GIT repository.

PROVIDED AND/OR DISCOVERED BY:
Juliano Rizzo and Thai Duong

ORIGINAL ADVISORY:
Mono:
http://www.mono-project.com/Vulnerabilities#ASP.NET_Padding_Oracle

Juliano Rizzo and Thai Duong:
http://netifera.com/research/poet//PaddingOraclesEverywhereEkoparty2010.pdf

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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