CVE-2019-1559 Information
Share on:Description
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).
CVSS Vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Reference
http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00041.html http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00019.html http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00046.html http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00047.html http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00049.html http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00080.html http://www.securityfocus.com/bid/107174 https://access.redhat.com/errata/RHSA-2019:2304 https://access.redhat.com/errata/RHSA-2019:2437 https://access.redhat.com/errata/RHSA-2019:2439 https://access.redhat.com/errata/RHSA-2019:2471 https://access.redhat.com/errata/RHSA-2019:3929 https://access.redhat.com/errata/RHSA-2019:3931 https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=e9bbefbf0f24c57645e7ad6a5a71ae649d18ac8e https://kc.mcafee.com/corporate/index?page=content&id=SB10282 https://lists.debian.org/debian-lts-announce/2019/03/msg00003.html https://lists.fedoraproject.org/archives/list/[email protected]/message/EWC42UXL5GHTU5G77VKBF6JYUUNGSHOM/ https://lists.fedoraproject.org/archives/list/[email protected]/message/Y3IVFGSERAZLNJCK35TEM2R4726XIH3Z/ https://lists.fedoraproject.org/archives/list/[email protected]/message/ZBEV5QGDRFUZDMNECFXUSN5FMYOZDE4V/ https://security.gentoo.org/glsa/201903-10 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://usn.ubuntu.com/3899-1/ https://usn.ubuntu.com/4376-2/ https://www.debian.org/security/2019/dsa-4400 https://www.openssl.org/news/secadv/20190226.txt https://www.oracle.com/security-alerts/cpujan2020.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://www.tenable.com/security/tns-2019-02 https://www.tenable.com/security/tns-2019-03
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction Required
NONE
Scope
NONE
Confidentiality Impact
UNCHANGED
Integrity Impact
HIGH
Availability Impact
NONE
Base Score
NONE
Base Severity
5.9