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TITLE:
OpenSSL Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA47426

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/47426/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=47426

RELEASE DATE:
2012-01-05

DISCUSS ADVISORY:
http://secunia.com/advisories/47426/#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/47426/

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=47426

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:
Multiple vulnerabilities have been reported in OpenSSL, which can be
exploited by malicious people to disclose potentially sensitive
information, cause a DoS (Denial of Service), and potentially
compromise an application using the library.

1) The CBC mode encryption of Datagram Transport Layer Security
(DTLS) exposes timing differences during the decryption process,
which can be exploited to recover the plaintext via a Vaudenay
padding oracle attack extension.

2) A double-free error exists within the policy checks if
X509_V_FLAG_POLICY_CHECK is used.

Note: This vulnerability does not affect version 1.0.0 and later.

3) The library does not properly clear the block cipher padding in
SSL 3.0 records, which may lead to 15 bytes of uninitialised memory
containing potentially sensitive information being encrypted and sent
to the SSL peer.

4) An error within the handling of malformed RFC 3779 data in
certificates can be exploited to cause assertion errors.

Successful exploitation of this vulnerability requires that OpenSSL
is configured with "enable-rfc3779" (disabled by default).

5) An error within the handshake restart handling for Server Gated
Cryptograpy (SGC) can be exploited to cause a DoS.

6) An error within the GOST ENGINE when processing invalid GOST
parameters can be exploited by a TLS client to cause a crash the
server by sending specially crafted GOST parameters.

SOLUTION:
Update to version 0.9.8s or 1.0.0f.

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

PROVIDED AND/OR DISCOVERED BY:
1) Nadhem Alfardan and Kenny Paterson, Information Security Group at
Royal Holloway, University of London

The vendor credits:
2) Ben Laurie
3, 5) Adam Langley
4) Andrew Chi, BBN Technologies
6) Andrey Kulikov

ORIGINAL ADVISORY:
OpenSSL Security Advisory [04 Jan 2012]:
http://openssl.org/news/secadv_20120104.txt

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:
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Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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