RHSA-2024:1544 - Security Advisory

Topic

An update for dnsmasq is now available for Red Hat Enterprise Linux 8.8 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The dnsmasq packages contain dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.

Security Fixes:

• dnsmasq: default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 (CVE-2023-28450)
• dnsmasq: bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator (CVE-2023-50387)
• dnsmasq: bind9: Preparing an NSEC3 closest encloser proof can exhaust CPU resources (CVE-2023-50868)

Bug Fix:

• Segmentation fault occurs in dnsmasq-2.79-26 in RHEL8

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support 8.8 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.8 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.8 ppc64le
• Red Hat Enterprise Linux Server - TUS 8.8 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.8 aarch64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.8 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.8 x86_64

Fixes

• BZ - 2178948 - CVE-2023-28450 dnsmasq: default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232
• BZ - 2263914 - CVE-2023-50387 bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator
• BZ - 2263917 - CVE-2023-50868 bind9: Preparing an NSEC3 closest encloser proof can exhaust CPU resources

CVEs

• CVE-2023-28450
• CVE-2023-50387
• CVE-2023-50868

References

• https://access.redhat.com/security/updates/classification/#important