Explain CVE-2018-0732
During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o).
Affected Products: OpenSSL
References: [{'name': '[debian-lts-announce] 20180728 [SECURITY] [DLA 1449-1] openssl security update', 'tags': ['mailing-list', 'x_refsource_MLIST'], 'url': 'https://lists.debian.org/debian-lts-announce/2018/07/msg00043.html'}, {'name': '104442', 'tags': ['vdb-entry', 'x_refsource_BID'], 'url': 'http://www.securityfocus.com/bid/104442'}, {'name': 'DSA-4355', 'tags': ['vendor-advisory', 'x_refsource_DEBIAN'], 'url': 'https://www.debian.org/security/2018/dsa-4355'}, {'name': 'RHSA-2018:2552', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://access.redhat.com/errata/RHSA-2018:2552'}, {'name': 'GLSA-201811-03', 'tags': ['vendor-advisory', 'x_refsource_GENTOO'], 'url': 'https://security.gentoo.org/glsa/201811-03'}, {'name': 'USN-3692-2', 'tags': ['vendor-advisory', 'x_refsource_UBUNTU'], 'url': 'https://usn.ubuntu.com/3692-2/'}, {'name': 'RHSA-2018:2553', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://access.redhat.com/errata/RHSA-2018:2553'}, {'name': 'RHSA-2018:3505', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://access.redhat.com/errata/RHSA-2018:3505'}, {'name': 'USN-3692-1', 'tags': ['vendor-advisory', 'x_refsource_UBUNTU'], 'url': 'https://usn.ubuntu.com/3692-1/'}, {'name': 'RHSA-2018:3221', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://access.redhat.com/errata/RHSA-2018:3221'}, {'name': 'DSA-4348', 'tags': ['vendor-advisory', 'x_refsource_DEBIAN'], 'url': 'https://www.debian.org/security/2018/dsa-4348'}, {'name': '1041090', 'tags': ['vdb-entry', 'x_refsource_SECTRACK'], 'url': 'http://www.securitytracker.com/id/1041090'}, {'name': 'RHSA-2019:1297', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://access.redhat.com/errata/RHSA-2019:1297'}, {'name': 'RHSA-2019:1296', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://access.redhat.com/errata/RHSA-2019:1296'}, {'name': 'RHSA-2019:1543', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://access.redhat.com/errata/RHSA-2019:1543'}, {'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/'}, {'tags': ['x_refsource_MISC'], 'url': 'https://www.oracle.com/security-alerts/cpuapr2020.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html'}, {'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/cpujan2021.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://www.tenable.com/security/tns-2018-14'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://securityadvisories.paloaltonetworks.com/Home/Detail/133'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://www.tenable.com/security/tns-2018-13'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://www.tenable.com/security/tns-2018-17'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://www.tenable.com/security/tns-2018-12'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://security.netapp.com/advisory/ntap-20181105-0001/'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://nodejs.org/en/blog/vulnerability/august-2018-security-releases/'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=3984ef0b72831da8b3ece4745cac4f8575b19098'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://www.openssl.org/news/secadv/20180612.txt'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=ea7abeeabf92b7aca160bdd0208636d4da69f4f4'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://security.netapp.com/advisory/ntap-20190118-0002/'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://cert-portal.siemens.com/productcert/pdf/ssa-419820.pdf'}]
CVE State: PUBLISHED