[IT-SecNots] [SECURITY] [DSA 2390-1] openssl security update

[Florian Weimer <fw AT deneb.enyo.de>]

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Debian Security Advisory DSA-2390-1                   security AT 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:

CVE-2011-4108
        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.

CVE-2011-4109 
        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.

CVE-2011-4354
        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.)

CVE-2011-4576
        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.

CVE-2011-4619
        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/

Mailing list: debian-security-announce AT lists.debian.org
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