GLSA-201203-12

Synopsis

Multiple vulnerabilities have been found in OpenSSL, allowing remote attackers to cause a Denial of Service or obtain sensitive information.

Background

OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer
(SSL v2/v3) and Transport Layer Security (TLS v1) as well as a general purpose cryptography library.

Description

Multiple vulnerabilities have been found in OpenSSL:

* Timing differences for decryption are exposed by CBC mode encryption in OpenSSL's implementation of DTLS (CVE-2011-4108).
* A policy check failure can result in a double-free error when X509_V_FLAG_POLICY_CHECK is set (CVE-2011-4109).
* Clients and servers using SSL 3.0 handshakes do not clear the block cipher padding, allowing a record to contain up to 15 bytes of uninitialized memory, which could include sensitive information (CVE-2011-4576).
* Assertion errors can occur during the handling of malformed X.509
certificates when OpenSSL is built with RFC 3779 support (CVE-2011-4577).
* A resource management error can occur when OpenSSL's server gated cryptography (SGC) does not properly handle handshake restarts (CVE-2011-4619).
* Invalid parameters in the GOST block cipher are not properly handled by the GOST ENGINE(CVE-2012-0027).
* An incorrect fix for CVE-2011-4108 creates an unspecified vulnerability for DTLS applications using OpenSSL (CVE-2012-0050).

Impact

A remote attacker may be able to cause a Denial of Service or obtain sensitive information, including plaintext passwords.

Workaround

There is no known workaround at this time.

Resolution

All OpenSSL users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-libs/openssl-1.0.0g"

References

[ 1 ] CVE-2011-4108 : http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4108
[ 2 ] CVE-2011-4109 : http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4109
[ 3 ] CVE-2011-4576 : http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4576
[ 4 ] CVE-2011-4577 : http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4577
[ 5 ] CVE-2011-4619 : http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4619
[ 6 ] CVE-2012-0027 : http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-0027
[ 7 ] CVE-2012-0050 : http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-0050

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-201203-12.xml