CVE-2023-50868

CVE-2023-50868 is a DNSSEC-related denial of service issue (NSEC3 Closest Encloser proof) that can cause CPU exhaustion. The connected documents confirm impact on DNS implementations such as Unbound and BIND/BIND9 and describe the root cause as processors performing thousands of hash iterations f...

CVE-2023-50387

CVE-2023-50387 (KeyTrap) affects DNSSEC processing in DNS resolvers. Multiple advisories note excessive CPU/DoS risk when validating DNSKEY/RRSIG in zones with many records. Affected products include Bind (bind9) and Unbound across Linux distributions (e.g., AL2, AlmaLinux) with patches/released ...

CVE-2023-50868

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...

powerdns-recursor -- Multiple Vulnerabilities

[email protected] reports: CVE-2023-50868: 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"...

Slackware Linux 15.0 / current dnsmasq Multiple Vulnerabilities (SSA:2024-044-02)

The version of dnsmasq installed on the remote host is prior to 2.90. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2024-044-02 advisory. - MITRE: CVE-2023-50387 DNSSEC verification complexity can be exploited to exhaust CPU resources and stall DNS resolvers...

CVE-2023-50387

Certain DNSSEC aspects of the DNS protocol in RFC 4033, 4034, 4035, 6840, and related RFCs allow remote attackers to cause a denial of service CPU consumption via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG...

ISC BIND Multiple DoS Vulnerabilities (CVE-2023-50387, CVE-2023-50868, KeyTrap) - Linux

ISC BIND is prone to multiple denial of service DoS vulnerabilities. SPDX-FileCopyrightText: 2024 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only CPE = "cpe:/a:isc:bind"; i...

CVE-2023-50387

Certain DNSSEC aspects of the DNS protocol in RFC 4033, 4034, 4035, 6840, and related RFCs allow remote attackers to cause a denial of service CPU consumption via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG...

CVE-2023-50868

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...

Ubuntu: Security Advisory (USN-6633-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2024 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

CVE-2023-50868

A flaw was found in bind9. By flooding a DNSSEC resolver with responses coming from a DNSEC-signed zone using NSEC3, an attacker can lead the targeted resolver to a CPU exhaustion, further leading to a Denial of Service on the targeted host. This vulnerability applies only for systems where DNSSE...

MITRE: CVE-2023-50387 DNSSEC verification complexity can be exploited to exhaust CPU resources and stall DNS resolvers

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PT-2024-1751

Vulnerability Report Name of the Vulnerable Software and Affected Versions BIND versions 9.16.48-1 through 9.18.24-1 Unbound versions 1.19.1-alt1 PDNS Recursor versions 4.8.6-1 Knot Resolver versions 5.6.0-1+deb12u1 systemd affected versions not specified dnsmasq affected versions not specified...

CVE-2023-50868

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...

CVE-2023-50387

Certain DNSSEC aspects of the DNS protocol in RFC 4033, 4034, 4035, 6840, and related RFCs allow remote attackers to cause a denial of service CPU consumption via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG...

ISC BIND 9.0.0 < 9.16.48 / 9.9.3-S1 < 9.16.48-S1 / 9.18.0 < 9.18.24 / 9.18.11-S1 < 9.18.24-S1 / 9.19.0 < 9.19.21 Vulnerability (cve-2023-50387)

The version of ISC BIND installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the cve-2023-50387 advisory. - Certain DNSSEC aspects of the DNS protocol in RFC 4033, 4034, 4035, 6840, and related RFCs allow remote attackers to cause...

Ubuntu 22.04 LTS / 23.10 : Bind vulnerabilities (USN-6633-1)

The remote Ubuntu 22.04 LTS / 23.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6633-1 advisory. Shoham Danino, Anat Bremler-Barr, Yehuda Afek, and Yuval Shavitt discovered that Bind incorrectly handled parsing large DNS messages. A remote...

Medium: systemd

Issue Overview: systemd-resolved accepts records of DNSSEC-signed domains even when they have no signature, allowing man-in-the-middles or the upstream DNS resolver to manipulate records. CVE-2023-7008 Affected Packages: systemd Issue Correction: Run dnf update systemd --releasever 2023.3.2024020...

Amazon Linux 2023 : systemd, systemd-boot-unsigned, systemd-container (ALAS2023-2024-509)

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2024-509 advisory. systemd-resolved accepts records of DNSSEC-signed domains even when they have no signature, allowing man- in-the-middles or the upstream DNS resolver to manipulate records. CVE-2023-7008 Tenable has...

DNSSEC validators -- denial-of-service/CPU exhaustion from KeyTrap and NSEC3 vulnerabilities

Simon Kelley reports: If DNSSEC validation is enabled, then an attacker who can force a DNS server to validate a specially crafted signed domain can use a lot of CPU in the validator. This only affects dnsmasq installations with DNSSEC enabled. Stichting NLnet Labs reports: The KeyTrap...