Secunia Security Advisory - 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.
27c5d23c6be9a30824814a60aacf25021583d39f03e237fb26e4d5e3b490d3ef
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TITLE:
OpenSSL Multiple Vulnerabilities
SECUNIA ADVISORY ID:
SA47426
VERIFY ADVISORY:
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http://secunia.com/advisories/47426/
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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:
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http://secunia.com/advisories/47426/
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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:
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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:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/
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