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Gentoo Linux Security Advisory GLSA 201603-15 |
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https://security.gentoo.org/ |
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|
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Severity: Normal |
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Title: OpenSSL: Multiple vulnerabilities |
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Date: March 20, 2016 |
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Bugs: #575548 |
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ID: 201603-15 |
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|
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Synopsis |
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======== |
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|
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Multiple vulnerabilities have been found in OpenSSL, the worst allowing |
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remote attackers to decrypt TLS sessions. |
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|
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Background |
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========== |
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|
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OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer |
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(SSL v2/v3) and Transport Layer Security (TLS v1) as well as a general |
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purpose cryptography library. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 dev-libs/openssl < 1.0.2g-r2 >= 1.0.2g-r2 |
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|
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Description |
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=========== |
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|
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Multiple vulnerabilities have been discovered in OpenSSL, the worst |
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being a cross-protocol attack called DROWN that could lead to the |
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decryption of TLS sessions. Please review the CVE identifiers |
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referenced below for details. |
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|
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Impact |
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====== |
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|
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A remote attacker could decrypt TLS sessions by using a server |
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supporting SSLv2 and EXPORT cipher suites as a |
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Bleichenbacher RSA padding oracle, cause a Denial of Service condition, |
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obtain sensitive information from memory and (in rare circumstances) |
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recover RSA keys. |
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|
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Workaround |
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========== |
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|
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A workaround for DROWN is disabling the SSLv2 protocol on all SSL/TLS |
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servers. |
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|
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Resolution |
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========== |
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|
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All OpenSSL users should upgrade to the latest version: |
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|
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=dev-libs/openssl-1.0.2g-r2" |
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|
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Please note that beginning with OpenSSL 1.0.2, in order to mitigate the |
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DROWN attack, the OpenSSL project disables SSLv2 by default at |
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build-time. As this change would cause severe issues with some Gentoo |
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packages that depend on OpenSSL, Gentoo still ships OpenSSL with SSLv2 |
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enabled at build-time. Note that this does not mean that you are still |
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vulnerable to DROWN because the OpenSSL project has taken further |
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precautions and applications would need to explicitly request SSLv2. We |
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are working on a migration path to phase out SSLv2 that ensures that no |
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user-facing issues occur. Please reference bug 576128 for further |
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details on how this decision was made. |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2016-0702 |
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http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0702 |
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[ 2 ] CVE-2016-0703 |
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http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0703 |
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[ 3 ] CVE-2016-0704 |
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http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0704 |
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[ 4 ] CVE-2016-0705 |
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http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0705 |
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[ 5 ] CVE-2016-0797 |
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http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0797 |
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[ 6 ] CVE-2016-0798 |
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http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0798 |
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[ 7 ] CVE-2016-0799 |
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http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0799 |
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[ 8 ] CVE-2016-0800 |
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http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0800 |
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|
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Availability |
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============ |
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|
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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|
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https://security.gentoo.org/glsa/201603-15 |
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|
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Concerns? |
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========= |
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|
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users' machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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https://bugs.gentoo.org. |
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|
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License |
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======= |
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|
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Copyright 2016 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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|
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/2.5 |