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Debian Security Advisory 2390-1

Debian Security Advisory 2390-1
Posted Jan 16, 2012
Authored by Debian | Site debian.org

Debian Linux Security Advisory 2390-1 - Several vulnerabilities were discovered in OpenSSL, an implementation of TLS and related protocols. 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.) Various other issues were also addressed.

tags | advisory, remote, arbitrary, vulnerability, protocol
systems | linux, debian
advisories | CVE-2011-4108, CVE-2011-4109, CVE-2011-4354, CVE-2011-4576, CVE-2011-4619
MD5 | 9bc0bec47f669b4481973e0c0e420aba

Debian Security Advisory 2390-1

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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
- -------------------------------------------------------------------------

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@lists.debian.org
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