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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
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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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