Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in c-ares - CVE-2023-31124

Vulnerability identifier: #VU76424

CSH Severity: Medium

CVSS v4.0: 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/E:U/U:Green

CVE-ID: CVE-2023-31124

CWE-ID: CWE-338

Exploitation vector: Remote access

Exploit availability: No public exploit available

Affected software:
c-ares
Amazon Linux AMI
Oracle Linux
Gentoo Linux
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Software Development Kit 12
SUSE CaaS Platform
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
openSUSE Leap Micro
SUSE Enterprise Storage
Red Hat Enterprise Linux for Power, little endian
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
SUSE OpenStack Cloud Crowbar
SUSE OpenStack Cloud
Oracle Solaris
Web and Scripting Module
SUSE Linux Enterprise Server 12 SP2 BCL
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server 12 SP4 ESPOS
SUSE Linux Enterprise Server for SAP Applications
SUSE Linux Enterprise Server 12 SP4 LTSS
SUSE Linux Enterprise Workstation Extension 12
Slackware Linux
SUSE Linux Enterprise Server 15 SP1 LTSS
SUSE Linux Enterprise High Performance Computing 15 SP1 LTSS
SUSE Linux Enterprise Server 15 SP2 LTSS
SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP3 LTSS
Basesystem Module
openSUSE Leap
Junos OS Evolved
Fedora
envoy
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
libcares2-32bit
libcares2-debuginfo-32bit
libcares-devel
libcares2-debugsource
libcares2
libcares2-debuginfo
c-ares
net-dns/c-ares
c-ares (Red Hat package)
c-ares-utils-debuginfo
c-ares-utils
c-ares-devel
c-ares-debugsource
libcares2-32bit-debuginfo
nodejs-nodemon
npm
rh-nodejs14-nodejs (Red Hat package)
nodejs (Red Hat package)
nodejs
nodejs-devel
nodejs-full-i18n
nodejs-docs
nodejs16-debugsource
nodejs16-devel
npm16
nodejs16-debuginfo
nodejs16
nodejs16-docs
corepack16
nodejs18-docs
nodejs18-debugsource
nodejs18
nodejs18-debuginfo
nodejs18-devel
npm18
corepack18
nodejs-packaging
nodejs-packaging-bundler
Node.js
ObjectScale
IBM Cloud Pak for Watson AIOps
EMC Cloud Tiering Appliance
IBM QRadar Data Synchronization App
App Connect Enterprise Certified Container
Dell EMC VxRail Appliance

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to an error when cross-compiling c-ares and using the autotools build system. As a result, the CARES_RANDOM_FILE is not be set, which results in usage of a rand() function as a fallback, leading to weak entropy.

Install updates from vendor's website.

• https://seclists.org/oss-sec/2023/q2/188
• https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1