Test ID:	1.3.6.1.4.1.25623.1.0.891701
Category:	Debian Local Security Checks
Title:	Debian LTS: Security Advisory for openssl (DLA-1701-1)
Summary:	Juraj Somorovsky, Robert Merget and Nimrod Aviram discovered a padding;oracle attack in OpenSSL.;;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).;AEAD ciphersuites are not impacted.
Description:	Summary: Juraj Somorovsky, Robert Merget and Nimrod Aviram discovered a padding oracle attack in OpenSSL. 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). AEAD ciphersuites are not impacted. Affected Software/OS: openssl on Debian Linux Solution: For Debian 8 'Jessie', this problem has been fixed in version 1.0.1t-1+deb8u11. We recommend that you upgrade your openssl packages. CVSS Score: 4.3 CVSS Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2019-1559 BugTraq ID: 107174 http://www.securityfocus.com/bid/107174 https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=e9bbefbf0f24c57645e7ad6a5a71ae649d18ac8e https://kc.mcafee.com/corporate/index?page=content&id=SB10282 https://security.netapp.com/advisory/ntap-20190301-0001/ https://security.netapp.com/advisory/ntap-20190301-0002/ https://security.netapp.com/advisory/ntap-20190423-0002/ https://support.f5.com/csp/article/K18549143 https://support.f5.com/csp/article/K18549143?utm_source=f5support&utm_medium=RSS https://www.openssl.org/news/secadv/20190226.txt https://www.tenable.com/security/tns-2019-02 https://www.tenable.com/security/tns-2019-03 Debian Security Information: DSA-4400 (Google Search) https://www.debian.org/security/2019/dsa-4400 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZBEV5QGDRFUZDMNECFXUSN5FMYOZDE4V/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Y3IVFGSERAZLNJCK35TEM2R4726XIH3Z/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EWC42UXL5GHTU5G77VKBF6JYUUNGSHOM/ https://security.gentoo.org/glsa/201903-10 https://www.oracle.com/security-alerts/cpujan2020.html https://www.oracle.com/security-alerts/cpujan2021.html https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html https://lists.debian.org/debian-lts-announce/2019/03/msg00003.html RedHat Security Advisories: RHSA-2019:2304 https://access.redhat.com/errata/RHSA-2019:2304 RedHat Security Advisories: RHSA-2019:2437 https://access.redhat.com/errata/RHSA-2019:2437 RedHat Security Advisories: RHSA-2019:2439 https://access.redhat.com/errata/RHSA-2019:2439 RedHat Security Advisories: RHSA-2019:2471 https://access.redhat.com/errata/RHSA-2019:2471 RedHat Security Advisories: RHSA-2019:3929 https://access.redhat.com/errata/RHSA-2019:3929 RedHat Security Advisories: RHSA-2019:3931 https://access.redhat.com/errata/RHSA-2019:3931 SuSE Security Announcement: openSUSE-SU-2019:1076 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00041.html SuSE Security Announcement: openSUSE-SU-2019:1105 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00019.html SuSE Security Announcement: openSUSE-SU-2019:1173 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00046.html SuSE Security Announcement: openSUSE-SU-2019:1175 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00047.html SuSE Security Announcement: openSUSE-SU-2019:1432 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00049.html SuSE Security Announcement: openSUSE-SU-2019:1637 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00080.html https://usn.ubuntu.com/3899-1/ https://usn.ubuntu.com/4376-2/
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