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ALAS-2024-2530

Related Vulnerabilities: CVE-2023-50387   CVE-2023-50868  

Certain DNSSEC aspects of the DNS protocol (in RFC 4035 and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses when there is a zone with many DNSKEY and RRSIG records, aka the "KeyTrap" issue. The protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records. (CVE-2023-50387) The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations. (CVE-2023-50868)

Source

ALAS-2024-2530

Amazon Linux 2 Security Advisory: ALAS-2024-2530
Advisory Release Date: 2024-04-24 22:15 Pacific
Advisory Updated Date: 2024-04-24 22:15 Pacific
Severity: Important
Issue Overview:

Certain DNSSEC aspects of the DNS protocol (in RFC 4035 and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses when there is a zone with many DNSKEY and RRSIG records, aka the "KeyTrap" issue. The protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records. (CVE-2023-50387)

The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations. (CVE-2023-50868)


Affected Packages:

bind


Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.


Issue Correction:
Run yum update bind to update your system.

New Packages:
aarch64:
    bind-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-pkcs11-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-pkcs11-utils-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-pkcs11-libs-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-pkcs11-devel-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-sdb-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-libs-lite-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-libs-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-utils-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-devel-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-lite-devel-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-chroot-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-sdb-chroot-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-export-libs-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-export-devel-9.11.4-26.P2.amzn2.13.6.aarch64
    bind-debuginfo-9.11.4-26.P2.amzn2.13.6.aarch64

i686:
    bind-9.11.4-26.P2.amzn2.13.6.i686
    bind-pkcs11-9.11.4-26.P2.amzn2.13.6.i686
    bind-pkcs11-utils-9.11.4-26.P2.amzn2.13.6.i686
    bind-pkcs11-libs-9.11.4-26.P2.amzn2.13.6.i686
    bind-pkcs11-devel-9.11.4-26.P2.amzn2.13.6.i686
    bind-sdb-9.11.4-26.P2.amzn2.13.6.i686
    bind-libs-lite-9.11.4-26.P2.amzn2.13.6.i686
    bind-libs-9.11.4-26.P2.amzn2.13.6.i686
    bind-utils-9.11.4-26.P2.amzn2.13.6.i686
    bind-devel-9.11.4-26.P2.amzn2.13.6.i686
    bind-lite-devel-9.11.4-26.P2.amzn2.13.6.i686
    bind-chroot-9.11.4-26.P2.amzn2.13.6.i686
    bind-sdb-chroot-9.11.4-26.P2.amzn2.13.6.i686
    bind-export-libs-9.11.4-26.P2.amzn2.13.6.i686
    bind-export-devel-9.11.4-26.P2.amzn2.13.6.i686
    bind-debuginfo-9.11.4-26.P2.amzn2.13.6.i686

noarch:
    bind-license-9.11.4-26.P2.amzn2.13.6.noarch

src:
    bind-9.11.4-26.P2.amzn2.13.6.src

x86_64:
    bind-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-pkcs11-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-pkcs11-utils-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-pkcs11-libs-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-pkcs11-devel-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-sdb-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-libs-lite-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-libs-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-utils-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-devel-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-lite-devel-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-chroot-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-sdb-chroot-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-export-libs-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-export-devel-9.11.4-26.P2.amzn2.13.6.x86_64
    bind-debuginfo-9.11.4-26.P2.amzn2.13.6.x86_64

Additional References

Red Hat: CVE-2023-50387, CVE-2023-50868

Mitre: CVE-2023-50387, CVE-2023-50868

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