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Joined: 12 May 2004
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PostPosted: Sun Mar 20, 2016 2:26 pm    Post subject: [ GLSA 201603-15 ] OpenSSL Reply with quote

Gentoo Linux Security Advisory

Title: OpenSSL: Multiple vulnerabilities (GLSA 201603-15)
Severity: normal
Exploitable: remote
Date: March 20, 2016
Bug(s): #575548
ID: 201603-15

Synopsis

Multiple vulnerabilities have been found in OpenSSL, the worst
allowing remote attackers to decrypt TLS sessions.


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.


Affected Packages

Package: dev-libs/openssl
Vulnerable: < 1.0.2g-r2
Unaffected: >= 1.0.2g-r2
Architectures: All supported architectures


Description

Multiple vulnerabilities have been discovered in OpenSSL, the worst
being a cross-protocol attack called DROWN that could lead to the
decryption of TLS sessions. Please review the CVE identifiers referenced
below for details.


Impact

A remote attacker could decrypt TLS sessions by using a server
supporting SSLv2 and EXPORT cipher suites as a
Bleichenbacher RSA padding oracle, cause a Denial of Service condition,
obtain sensitive information from memory and (in rare circumstances)
recover RSA keys.


Workaround

A workaround for DROWN is disabling the SSLv2 protocol on all SSL/TLS
servers.


Resolution

All OpenSSL users should upgrade to the latest version:
Code:
# emerge --sync
      # emerge --ask --oneshot --verbose ">=dev-libs/openssl-1.0.2g-r2"
   
Please note that beginning with OpenSSL 1.0.2, in order to mitigate the
DROWN attack, the OpenSSL project disables SSLv2 by default at
build-time. As this change would cause severe issues with some Gentoo
packages that depend on OpenSSL, Gentoo still ships OpenSSL with SSLv2
enabled at build-time. Note that this does not mean that you are still
vulnerable to DROWN because the OpenSSL project has taken further
precautions and applications would need to explicitly request SSLv2. We
are working on a migration path to phase out SSLv2 that ensures that no
user-facing issues occur. Please reference bug 576128 for further details
on how this decision was made.


References

CVE-2016-0702
CVE-2016-0703
CVE-2016-0704
CVE-2016-0705
CVE-2016-0797
CVE-2016-0798
CVE-2016-0799
CVE-2016-0800
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