Improper Certificate Validation in Mozilla NSS - CVE-2019-11727

Vulnerability identifier: #VU47195

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-11727

CWE-ID: CWE-295

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists doe to an error within the Mozilla NSS library, when working with TLS certificates. A remote attacker can force Network Security Services (NSS) to sign CertificateVerify with PKCS#1 v1.5 signatures when those are the only ones advertised by server in CertificateRequest in TLS 1.3. A remote attacker can perform a Man-in-the-Middle attack and gain access to sensitive information.

Mozilla NSS
Amazon Linux AMI
CentOS
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Opensuse
Ansible Automation Platform
Secure Remote Services (SRS) Virtual Edition
Data Computing Appliance (DCA)
nss (Red Hat package)
nss-util (Red Hat package)
nss-softokn (Red Hat package)
nspr (Red Hat package)
Red Hat OpenShift Container Platform

Install updates from vendor's website.

Mozilla NSS - addressed in versions 3.44.2, 3.45
Ansible Automation Platform - addressed in versions 1.0, 1.1, 1.2.4
Secure Remote Services (SRS) Virtual Edition - update to 3.46.00.04
Data Computing Appliance (DCA) - addressed in versions Firmware tool 3H00, 4.2.1.0
nss (Red Hat package) - addressed in versions 3.44.0-7.el8_0, 3.53.1-3.el7_9
nss-util (Red Hat package) - update to 3.53.1-1.el7_9
nss-softokn (Red Hat package) - update to 3.53.1-6.el7_9
Red Hat OpenShift Container Platform - update to 4.3.40
nspr (Red Hat package) - addressed in versions 4.21.0-2.el8_0, 4.25.0-2.el7_9

• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00006.html
• https://access.redhat.com/errata/RHSA-2019:1951
• https://bugzilla.mozilla.org/show_bug.cgi?id=1552208
• https://security.gentoo.org/glsa/201908-12
• https://www.mozilla.org/security/advisories/mfsa2019-21/

• Red Hat Enterprise Linux 7 update for nss and nspr
• OpenSUSE Linux update for mozilla-nspr, mozilla-nss
• CentOS 7 update for nss
• Amazon Linux AMI update for nspr, nss-softokn, nss-util
• Multiple vulnerabilities in Dell EMC Data Computing Appliance (DCA)
• Multiple vulnerabilities in Dell EMC Secure Remote Services (SRS) Virtual Edition
• Red Hat Enterprise Linux 8 update for nss and nspr
• Multiple vulnerabilities in Red Hat Ansible Automation Platform 1.2
• Multiple vulnerabilities in Ansible Automation Platform 1.0 packages
• Multiple vulnerabilities in Ansible Automation Platform 1.1 packages
• Multiple vulnerabilities in Red Hat OpenShift Container Platform 4.3