RHSA-2024:1781 - Security Advisory

Topic

An update for bind9.16 is now available for Red Hat Enterprise Linux 8.

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 Berkeley Internet Name Domain (BIND) is an implementation of the Domain Name System (DNS) protocols. BIND includes a DNS server (named); a resolver library (routines for applications to use when interfacing with DNS); and tools for verifying that the DNS server is operating correctly.

Security Fix(es):

• bind9: Parsing large DNS messages may cause excessive CPU load (CVE-2023-4408)
• bind9: Querying RFC 1918 reverse zones may cause an assertion failure when “nxdomain-redirect” is enabled (CVE-2023-5517)
• bind9: Enabling both DNS64 and serve-stale may cause an assertion failure during recursive resolution (CVE-2023-5679)
• bind9: Specific recursive query patterns may lead to an out-of-memory condition (CVE-2023-6516)
• bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator (CVE-2023-50387)
• bind9: Preparing an NSEC3 closest encloser proof can exhaust CPU resources (CVE-2023-50868)

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 8 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for ARM 64 8 aarch64
• Red Hat CodeReady Linux Builder for x86_64 8 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 8 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 8 aarch64
• Red Hat CodeReady Linux Builder for IBM z Systems 8 s390x

Fixes

• BZ - 2263896 - CVE-2023-4408 bind9: Parsing large DNS messages may cause excessive CPU load
• BZ - 2263897 - CVE-2023-5517 bind9: Querying RFC 1918 reverse zones may cause an assertion failure when ?nxdomain-redirect? is enabled
• BZ - 2263909 - CVE-2023-5679 bind9: Enabling both DNS64 and serve-stale may cause an assertion failure during recursive resolution
• BZ - 2263911 - CVE-2023-6516 bind9: Specific recursive query patterns may lead to an out-of-memory condition
• 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-2023-4408
• CVE-2023-5517
• CVE-2023-5679
• CVE-2023-6516
• CVE-2023-50387
• CVE-2023-50868

References

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