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CVE-2019-1547 Detail

Description

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).


Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  4.7 MEDIUM
Vector:  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
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 Third Party Advisory 
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=21c856b75d81eff61aa63b4f036bb64a85bf6d46
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=30c22fa8b1d840036b8e203585738df62a03cec8
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=7c1709c2da5414f5b6133d00a03fc8c5bf996c7a
https://kc.mcafee.com/corporate/index?page=content&id=SB10365
https://lists.debian.org/debian-lts-announce/2019/09/msg00026.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GY6SNRJP2S7Y42GIIDO3HXPNMDYN2U3A/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZN4VVQJ3JDCHGIHV4Y2YTXBYQZ6PWQ7E/
https://seclists.org/bugtraq/2019/Oct/0
https://seclists.org/bugtraq/2019/Oct/1
https://seclists.org/bugtraq/2019/Sep/25 Third Party Advisory 
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&amp%3Butm_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 Vendor Advisory 
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

Weakness Enumeration

CWE-ID CWE Name Source
NVD-CWE-noinfo Insufficient Information cwe source acceptance level NIST  

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Change History

29 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2019-1547
NVD Published Date:
09/10/2019
NVD Last Modified:
11/06/2023
Source:
OpenSSL Software Foundation