rhsa-2016_0304
Vulnerability from csaf_redhat
Published
2016-03-01 14:45
Modified
2024-09-15 22:25
Summary
Red Hat Security Advisory: openssl security update
Notes
Topic
Updated openssl packages that fix multiple security issues are now
available for Red Hat Enterprise Linux 5.6 and 5.9 Long Life.
Red Hat Product Security has rated this update as having Important security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.
Details
OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL v2/v3)
and Transport Layer Security (TLS v1) protocols, as well as a
full-strength, general purpose cryptography library.
A padding oracle flaw was found in the Secure Sockets Layer version 2.0
(SSLv2) protocol. An attacker can potentially use this flaw to decrypt
RSA-encrypted cipher text from a connection using a newer SSL/TLS protocol
version, allowing them to decrypt such connections. This cross-protocol
attack is publicly referred to as DROWN. (CVE-2016-0800)
Note: This issue was addressed by disabling the SSLv2 protocol by default
when using the 'SSLv23' connection methods, and removing support for weak
SSLv2 cipher suites. It is possible to re-enable the SSLv2 protocol in the
'SSLv23' connection methods by default by setting the OPENSSL_ENABLE_SSL2
environment variable before starting an application that needs to have
SSLv2 enabled. For more information, refer to the knowledge base article
linked to in the References section.
It was discovered that the SSLv2 servers using OpenSSL accepted SSLv2
connection handshakes that indicated non-zero clear key length for
non-export cipher suites. An attacker could use this flaw to decrypt
recorded SSLv2 sessions with the server by using it as a decryption
oracle.(CVE-2016-0703)
It was discovered that the SSLv2 protocol implementation in OpenSSL did
not properly implement the Bleichenbacher protection for export cipher
suites. An attacker could use a SSLv2 server using OpenSSL as a
Bleichenbacher oracle. (CVE-2016-0704)
Note: The CVE-2016-0703 and CVE-2016-0704 issues could allow for more
efficient exploitation of the CVE-2016-0800 issue via the DROWN attack.
A denial of service flaw was found in the way OpenSSL handled SSLv2
handshake messages. A remote attacker could use this flaw to cause a
TLS/SSL server using OpenSSL to exit on a failed assertion if it had both
the SSLv2 protocol and EXPORT-grade cipher suites enabled. (CVE-2015-0293)
A flaw was found in the way malicious SSLv2 clients could negotiate SSLv2
ciphers that have been disabled on the server. This could result in weak
SSLv2 ciphers being used for SSLv2 connections, making them vulnerable to
man-in-the-middle attacks. (CVE-2015-3197)
Red Hat would like to thank the OpenSSL project for reporting these issues.
Upstream acknowledges Nimrod Aviram and Sebastian Schinzel as the original
reporters of CVE-2016-0800 and CVE-2015-3197; David Adrian (University of
Michigan) and J. Alex Halderman (University of Michigan) as the original
reporters of CVE-2016-0703 and CVE-2016-0704; and Sean Burford (Google) and
Emilia Käsper (OpenSSL development team) as the original reporters of
CVE-2015-0293.
All openssl users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. For the update to take
effect, all services linked to the OpenSSL library must be restarted, or
the system rebooted.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"text": "OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL v2/v3)\nand Transport Layer Security (TLS v1) protocols, as well as a\nfull-strength, general purpose cryptography library.\n\nA padding oracle flaw was found in the Secure Sockets Layer version 2.0\n(SSLv2) protocol. An attacker can potentially use this flaw to decrypt\nRSA-encrypted cipher text from a connection using a newer SSL/TLS protocol\nversion, allowing them to decrypt such connections. This cross-protocol\nattack is publicly referred to as DROWN. (CVE-2016-0800)\n\nNote: This issue was addressed by disabling the SSLv2 protocol by default\nwhen using the \u0027SSLv23\u0027 connection methods, and removing support for weak\nSSLv2 cipher suites. It is possible to re-enable the SSLv2 protocol in the\n\u0027SSLv23\u0027 connection methods by default by setting the OPENSSL_ENABLE_SSL2\nenvironment variable before starting an application that needs to have\nSSLv2 enabled. For more information, refer to the knowledge base article\nlinked to in the References section.\n\nIt was discovered that the SSLv2 servers using OpenSSL accepted SSLv2\nconnection handshakes that indicated non-zero clear key length for\nnon-export cipher suites. An attacker could use this flaw to decrypt\nrecorded SSLv2 sessions with the server by using it as a decryption \noracle.(CVE-2016-0703)\n\nIt was discovered that the SSLv2 protocol implementation in OpenSSL did \nnot properly implement the Bleichenbacher protection for export cipher \nsuites. An attacker could use a SSLv2 server using OpenSSL as a \nBleichenbacher oracle. (CVE-2016-0704)\n\nNote: The CVE-2016-0703 and CVE-2016-0704 issues could allow for more\nefficient exploitation of the CVE-2016-0800 issue via the DROWN attack.\n\nA denial of service flaw was found in the way OpenSSL handled SSLv2\nhandshake messages. A remote attacker could use this flaw to cause a\nTLS/SSL server using OpenSSL to exit on a failed assertion if it had both\nthe SSLv2 protocol and EXPORT-grade cipher suites enabled. (CVE-2015-0293)\n\nA flaw was found in the way malicious SSLv2 clients could negotiate SSLv2\nciphers that have been disabled on the server. This could result in weak\nSSLv2 ciphers being used for SSLv2 connections, making them vulnerable to\nman-in-the-middle attacks. (CVE-2015-3197)\n\nRed Hat would like to thank the OpenSSL project for reporting these issues.\nUpstream acknowledges Nimrod Aviram and Sebastian Schinzel as the original\nreporters of CVE-2016-0800 and CVE-2015-3197; David Adrian (University of\nMichigan) and J. Alex Halderman (University of Michigan) as the original\nreporters of CVE-2016-0703 and CVE-2016-0704; and Sean Burford (Google) and\nEmilia K\u00e4sper (OpenSSL development team) as the original reporters of\nCVE-2015-0293.\n\nAll openssl users are advised to upgrade to these updated packages, which\ncontain backported patches to correct these issues. For the update to take\neffect, all services linked to the OpenSSL library must be restarted, or\nthe system rebooted.",
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"title": "Statement"
},
{
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{
"category": "general",
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"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
"version": "2.0"
},
"products": [
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "SSL/TLS: Cross-protocol attack on TLS using SSLv2 (DROWN)"
}
]
}
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