| Description: | Summary:
The remote host is missing an update for the 'openssl' package(s) announced via the USN-1357-1 advisory.
Vulnerability Insight:
It was discovered that the elliptic curve cryptography (ECC) subsystem
in OpenSSL, when using the Elliptic Curve Digital Signature Algorithm
(ECDSA) for the ECDHE_ECDSA cipher suite, did not properly implement
curves over binary fields. This could allow an attacker to determine
private keys via a timing attack. This issue only affected Ubuntu 8.04
LTS, Ubuntu 10.04 LTS, Ubuntu 10.10 and Ubuntu 11.04. (CVE-2011-1945)
Adam Langley discovered that the ephemeral Elliptic Curve
Diffie-Hellman (ECDH) functionality in OpenSSL did not ensure thread
safety while processing handshake messages from clients. This
could allow a remote attacker to cause a denial of service via
out-of-order messages that violate the TLS protocol. This issue only
affected Ubuntu 8.04 LTS, Ubuntu 10.04 LTS, Ubuntu 10.10 and Ubuntu
11.04. (CVE-2011-3210)
Nadhem Alfardan and Kenny Paterson discovered that the Datagram
Transport Layer Security (DTLS) implementation in OpenSSL performed a
MAC check only if certain padding is valid. This could allow a remote
attacker to recover plaintext. (CVE-2011-4108)
Antonio Martin discovered that a flaw existed in the fix to address
CVE-2011-4108, the DTLS MAC check failure. This could allow a remote
attacker to cause a denial of service. (CVE-2012-0050)
Ben Laurie discovered a double free vulnerability in OpenSSL that could
be triggered when the X509_V_FLAG_POLICY_CHECK flag is enabled. This
could allow a remote attacker to cause a denial of service. This
issue only affected Ubuntu 8.04 LTS, Ubuntu 10.04 LTS, Ubuntu 10.10
and Ubuntu 11.04. (CVE-2011-4109)
It was discovered that OpenSSL, in certain circumstances involving
ECDH or ECDHE cipher suites, used an incorrect modular reduction
algorithm in its implementation of the P-256 and P-384 NIST elliptic
curves. This could allow a remote attacker to obtain the private
key of a TLS server via multiple handshake attempts. This issue only
affected Ubuntu 8.04 LTS. (CVE-2011-4354)
Adam Langley discovered that the SSL 3.0 implementation in OpenSSL
did not properly initialize data structures for block cipher
padding. This could allow a remote attacker to obtain sensitive
information. (CVE-2011-4576)
Andrew Chi discovered that OpenSSL, when RFC 3779 support is enabled,
could trigger an assert when handling an X.509 certificate containing
certificate-extension data associated with IP address blocks or
Autonomous System (AS) identifiers. This could allow a remote attacker
to cause a denial of service. (CVE-2011-4577)
Adam Langley discovered that the Server Gated Cryptography (SGC)
implementation in OpenSSL did not properly handle handshake
restarts. This could allow a remote attacker to cause a denial of
service. (CVE-2011-4619)
Andrey Kulikov discovered that the GOST block cipher engine in OpenSSL
did not properly handle invalid parameters. This could allow a remote
attacker to cause a denial of service via crafted data from a TLS
client. This issue only affected Ubuntu 11.10. (CVE-2012-0027)
Affected Software/OS:
'openssl' package(s) on Ubuntu 8.04, Ubuntu 10.04, Ubuntu 10.10, Ubuntu 11.04, Ubuntu 11.10.
Solution:
Please install the updated package(s).
CVSS Score:
9.3
CVSS Vector:
AV:N/AC:M/Au:N/C:C/I:C/A:C
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