CVE-2019-1547 Information
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Normally in OpenSSL EC groups always have a co-factor present and this is used in side channel resistant code paths. However in some cases it is possible to construct a group using explicit parameters (instead of using a named curve). In those cases it is possible that such a group does not have the cofactor present. This can occur even where all the parameters match a known named curve. If such a curve is used then OpenSSL falls back to non-side channel resistant code paths which may result in full key recovery during an ECDSA signature operation. In order to be vulnerable an attacker would have to have the ability to time the creation of a large number of signatures where explicit parameters with no co-factor present are in use by an application using libcrypto. For the avoidance of doubt libssl is not vulnerable because explicit parameters are never used. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).
CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Reference
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00054.html http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00072.html http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00012.html http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00016.html http://packetstormsecurity.com/files/154467/Slackware-Security-Advisory-openssl-Updates.html https://arxiv.org/abs/1909.01785 https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=21c856b75d81eff61aa63b4f036bb64a85bf6d46 https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=30c22fa8b1d840036b8e203585738df62a03cec8 https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=7c1709c2da5414f5b6133d00a03fc8c5bf996c7a https://lists.debian.org/debian-lts-announce/2019/09/msg00026.html https://lists.fedoraproject.org/archives/list/[email protected]/message/GY6SNRJP2S7Y42GIIDO3HXPNMDYN2U3A/ https://lists.fedoraproject.org/archives/list/[email protected]/message/ZN4VVQJ3JDCHGIHV4Y2YTXBYQZ6PWQ7E/ https://seclists.org/bugtraq/2019/Oct/0 https://seclists.org/bugtraq/2019/Oct/1 https://seclists.org/bugtraq/2019/Sep/25 https://security.gentoo.org/glsa/201911-04 https://security.netapp.com/advisory/ntap-20190919-0002/ https://security.netapp.com/advisory/ntap-20200122-0002/ https://security.netapp.com/advisory/ntap-20200416-0003/ https://support.f5.com/csp/article/K73422160?utm_source=f5support&utm_medium=RSS https://usn.ubuntu.com/4376-1/ https://usn.ubuntu.com/4376-2/ https://usn.ubuntu.com/4504-1/ https://www.debian.org/security/2019/dsa-4539 https://www.debian.org/security/2019/dsa-4540 https://www.openssl.org/news/secadv/20190910.txt https://www.oracle.com/security-alerts/cpuapr2020.html https://www.oracle.com/security-alerts/cpujan2020.html https://www.oracle.com/security-alerts/cpujul2020.html https://www.oracle.com/security-alerts/cpuoct2020.html https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html https://www.tenable.com/security/tns-2019-08 https://www.tenable.com/security/tns-2019-09
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction Required
LOW
Scope
NONE
Confidentiality Impact
UNCHANGED
Integrity Impact
HIGH
Availability Impact
NONE
Base Score
NONE
Base Severity
4.7