2019-02-28 00:29:00 2020-08-24 19:37:00

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).

Vector

NETWORK

Complexity

MEDIUM

Authentication

NONE

Confidentiality

PARTIAL

Integrity

NONE

Availability

NONE
Advisory Patch Confirmed Link
https://security.netapp.com/advisory/ntap-20190301-0002/
https://support.f5.com/csp/article/K18549143
https://usn.ubuntu.com/3899-1/
https://www.oracle.com/technetwork/security-advisory/cpu...
https://www.openssl.org/news/secadv/20190226.txt
https://usn.ubuntu.com/4376-2/
https://security.netapp.com/advisory/ntap-20190423-0002/
https://www.oracle.com/security-alerts/cpujan2020.html
https://www.debian.org/security/2019/dsa-4400
https://security.gentoo.org/glsa/201903-10
https://lists.fedoraproject.org/archives/list/package-an...
https://lists.fedoraproject.org/archives/list/package-an...
https://lists.fedoraproject.org/archives/list/package-an...
https://support.f5.com/csp/article/K18549143?utm_source=...
https://www.oracle.com/technetwork/security-advisory/cpu...
https://security.netapp.com/advisory/ntap-20190301-0001/
https://lists.debian.org/debian-lts-announce/2019/03/msg...
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdi...
https://kc.mcafee.com/corporate/index?page=content&id=SB...
https://access.redhat.com/errata/RHSA-2019:3931
https://access.redhat.com/errata/RHSA-2019:3929
https://access.redhat.com/errata/RHSA-2019:2471
https://access.redhat.com/errata/RHSA-2019:2439
https://access.redhat.com/errata/RHSA-2019:2437
https://access.redhat.com/errata/RHSA-2019:2304
http://www.securityfocus.com/bid/107174
http://lists.opensuse.org/opensuse-security-announce/201...
http://lists.opensuse.org/opensuse-security-announce/201...
http://lists.opensuse.org/opensuse-security-announce/201...
http://lists.opensuse.org/opensuse-security-announce/201...
http://lists.opensuse.org/opensuse-security-announce/201...
http://lists.opensuse.org/opensuse-security-announce/201...
https://www.oracle.com/technetwork/security-advisory/cpu...
https://www.tenable.com/security/tns-2019-02
https://www.tenable.com/security/tns-2019-03