Secunia Security Advisory - 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.
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TITLE:
MatrixSSL SSL/TLS Initialization Vector Selection Weakness
SECUNIA ADVISORY ID:
SA46379
VERIFY ADVISORY:
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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:
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http://secunia.com/advisories/46379/
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https://ca.secunia.com/?page=viewadvisory&vuln_id=46379
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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:
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EXTENDED DESCRIPTION:
Further details available in Customer Area:
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EXTENDED SOLUTION:
Further details available in Customer Area:
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EXPLOIT:
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http://secunia.com/vulnerability_intelligence/
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