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TITLE:
MatrixSSL SSL/TLS Initialization Vector Selection Weakness

SECUNIA ADVISORY ID:
SA46379

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46379/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46379

RELEASE DATE:
2011-10-16

DISCUSS ADVISORY:
http://secunia.com/advisories/46379/#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/46379/

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=46379

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 MatrixSSL, 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.

The weakness is reported in versions prior to 3.2.2.

SOLUTION:
Update to version 3.2.2 and use the "USE_BEAST_WORKAROUND" compile
time define (default).

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

ORIGINAL ADVISORY:
MatrixSSL:
http://www.matrixssl.org/archives/000163.html
http://www.matrixssl.org/archives/000164.html

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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Definitions: (Criticality, Where etc.)
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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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