DSA 2390-1: openssl security update
Posted on: 01/16/2012 10:03 AM

An OpenSSL security update has been released for Debian GNU/Linux

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Debian Security Advisory DSA-2390-1 security@debian.org
http://www.debian.org/security/ Florian Weimer
January 15, 2012 http://www.debian.org/security/faq
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Package : openssl
Vulnerability : several
Problem type : remote
Debian-specific: no
CVE ID : CVE-2011-4108 CVE-2011-4109 CVE-2011-4354
CVE-2011-4576 CVE-2011-4619

Several vulnerabilities were discovered in OpenSSL, an implementation
of TLS and related protocols. The Common Vulnerabilities and
Exposures project identifies the following vulnerabilities:

The DTLS implementation performs a MAC check only if certain
padding is valid, which makes it easier for remote attackers
to recover plaintext via a padding oracle attack.

A double free vulnerability when X509_V_FLAG_POLICY_CHECK is
enabled, allows remote attackers to cause applications crashes
and potentially allow execution of arbitrary code by
triggering failure of a policy check.

On 32-bit systems, the operations on NIST elliptic curves
P-256 and P-384 are not correctly implemented, potentially
leaking the private ECC key of a TLS server. (Regular
RSA-based keys are not affected by this vulnerability.)

The SSL 3.0 implementation does not properly initialize data
structures for block cipher padding, which might allow remote
attackers to obtain sensitive information by decrypting the
padding data sent by an SSL peer.

The Server Gated Cryptography (SGC) implementation in OpenSSL
does not properly handle handshake restarts, unnecessarily
simplifying CPU exhaustion attacks.

For the oldstable distribution (lenny), these problems have been fixed
in version 0.9.8g-15+lenny15.

For the stable distribution (squeeze), these problems have been fixed
in version 0.9.8o-4squeeze5.

For the testing distribution (wheezy) and the unstable distribution
(sid), these problems have been fixed in version 1.0.0f-1.

We recommend that you upgrade your openssl packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

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