Explain CVE-2019-1559
If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).
Affected Products: OpenSSL
References: [{'name': '107174', 'tags': ['vdb-entry', 'x_refsource_BID'], 'url': 'http://www.securityfocus.com/bid/107174'}, {'name': 'GLSA-201903-10', 'tags': ['vendor-advisory', 'x_refsource_GENTOO'], 'url': 'https://security.gentoo.org/glsa/201903-10'}, {'name': 'USN-3899-1', 'tags': ['vendor-advisory', 'x_refsource_UBUNTU'], 'url': 'https://usn.ubuntu.com/3899-1/'}, {'name': '[debian-lts-announce] 20190301 [SECURITY] [DLA 1701-1] openssl security update', 'tags': ['mailing-list', 'x_refsource_MLIST'], 'url': 'https://lists.debian.org/debian-lts-announce/2019/03/msg00003.html'}, {'name': 'DSA-4400', 'tags': ['vendor-advisory', 'x_refsource_DEBIAN'], 'url': 'https://www.debian.org/security/2019/dsa-4400'}, {'name': 'openSUSE-SU-2019:1076', 'tags': ['vendor-advisory', 'x_refsource_SUSE'], 'url': 'http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00041.html'}, {'name': 'openSUSE-SU-2019:1105', 'tags': ['vendor-advisory', 'x_refsource_SUSE'], 'url': 'http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00019.html'}, {'name': 'openSUSE-SU-2019:1173', 'tags': ['vendor-advisory', 'x_refsource_SUSE'], 'url': 'http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00046.html'}, {'name': 'openSUSE-SU-2019:1175', 'tags': ['vendor-advisory', 'x_refsource_SUSE'], 'url': 'http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00047.html'}, {'name': 'openSUSE-SU-2019:1432', 'tags': ['vendor-advisory', 'x_refsource_SUSE'], 'url': 'http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00049.html'}, {'name': 'openSUSE-SU-2019:1637', 'tags': ['vendor-advisory', 'x_refsource_SUSE'], 'url': 'http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00080.html'}, {'name': 'RHSA-2019:2304', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://access.redhat.com/errata/RHSA-2019:2304'}, {'name': 'RHSA-2019:2439', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://access.redhat.com/errata/RHSA-2019:2439'}, {'name': 'RHSA-2019:2437', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://access.redhat.com/errata/RHSA-2019:2437'}, {'name': 'RHSA-2019:2471', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://access.redhat.com/errata/RHSA-2019:2471'}, {'name': 'FEDORA-2019-db06efdea1', 'tags': ['vendor-advisory', 'x_refsource_FEDORA'], 'url': 'https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EWC42UXL5GHTU5G77VKBF6JYUUNGSHOM/'}, {'name': 'FEDORA-2019-00c25b9379', 'tags': ['vendor-advisory', 'x_refsource_FEDORA'], 'url': 'https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZBEV5QGDRFUZDMNECFXUSN5FMYOZDE4V/'}, {'name': 'FEDORA-2019-9a0a7c0986', 'tags': ['vendor-advisory', 'x_refsource_FEDORA'], 'url': 'https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3IVFGSERAZLNJCK35TEM2R4726XIH3Z/'}, {'name': 'RHSA-2019:3929', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://access.redhat.com/errata/RHSA-2019:3929'}, {'name': 'RHSA-2019:3931', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://access.redhat.com/errata/RHSA-2019:3931'}, {'tags': ['x_refsource_MISC'], 'url': 'https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html'}, {'tags': ['x_refsource_MISC'], 'url': 'https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html'}, {'tags': ['x_refsource_MISC'], 'url': 'https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html'}, {'tags': ['x_refsource_MISC'], 'url': 'https://www.oracle.com/security-alerts/cpujan2020.html'}, {'name': 'USN-4376-2', 'tags': ['vendor-advisory', 'x_refsource_UBUNTU'], 'url': 'https://usn.ubuntu.com/4376-2/'}, {'tags': ['x_refsource_MISC'], 'url': 'https://www.oracle.com/security-alerts/cpujan2021.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://security.netapp.com/advisory/ntap-20190301-0001/'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://security.netapp.com/advisory/ntap-20190301-0002/'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=e9bbefbf0f24c57645e7ad6a5a71ae649d18ac8e'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://www.openssl.org/news/secadv/20190226.txt'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://support.f5.com/csp/article/K18549143'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://www.tenable.com/security/tns-2019-02'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://security.netapp.com/advisory/ntap-20190423-0002/'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://www.tenable.com/security/tns-2019-03'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://kc.mcafee.com/corporate/index?page=content&id=SB10282'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://support.f5.com/csp/article/K18549143?utm_source=f5support&amp%3Butm_medium=RSS'}]
CVE State: PUBLISHED