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TITLE:
Microsoft Windows SSL/TLS Initialization Vector Selection Weakness

SECUNIA ADVISORY ID:
SA46168

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46168/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46168

RELEASE DATE:
2011-09-29

DISCUSS ADVISORY:
http://secunia.com/advisories/46168/#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/46168/

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=46168

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 weakness has been reported in Microsoft Windows, which can be
exploited by malicious people to disclose potentially sensitive
information and hijack a user's session.

The weakness is caused due to a design error in the Secure Sockets
Layer 3.0 (SSL) and Transport Layer Security 1.0 (TLS) protocols when
selecting a Initialization Vector (IV) used with symmetric cipher
suites in CBC mode (e.g. AES). This can be exploited to conduct a
chosen-plaintext attack which would allow the decryption of e.g HTTPS
sessions via a Man-in-the-Middle (MitM) attack.

SOLUTION:
As a workaround enable TLS 1.1 or 1.2 (please see the vendor's
advisory for details).

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

ORIGINAL ADVISORY:
Microsoft (KB2588513):
http://technet.microsoft.com/en-us/security/advisory/2588513

Thai Duong:
http://vnhacker.blogspot.com/2011/09/beast.html

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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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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