rhsa-2024_1781
Vulnerability from csaf_redhat
Published
2024-04-11 11:06
Modified
2025-01-06 21:59
Summary
Red Hat Security Advisory: bind9.16 security update
Notes
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.
Details
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.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
{ document: { aggregate_severity: { namespace: "https://access.redhat.com/security/updates/classification/", text: "Important", }, category: "csaf_security_advisory", csaf_version: "2.0", distribution: { text: "Copyright © Red Hat, Inc. All rights reserved.", tlp: { label: "WHITE", url: "https://www.first.org/tlp/", }, }, lang: "en", notes: [ { category: "summary", text: "An update for bind9.16 is now available for Red Hat Enterprise Linux 8.\n\nRed 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.", title: "Topic", }, { category: "general", text: "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.\n\nSecurity Fix(es):\n\n* bind9: Parsing large DNS messages may cause excessive CPU load (CVE-2023-4408)\n\n* bind9: Querying RFC 1918 reverse zones may cause an assertion failure when “nxdomain-redirect” is enabled (CVE-2023-5517)\n\n* bind9: Enabling both DNS64 and serve-stale may cause an assertion failure during recursive resolution (CVE-2023-5679)\n\n* bind9: Specific recursive query patterns may lead to an out-of-memory condition (CVE-2023-6516)\n\n* bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator (CVE-2023-50387)\n\n* bind9: Preparing an NSEC3 closest encloser proof can exhaust CPU resources (CVE-2023-50868)\n\nFor 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.", title: "Details", }, { category: "legal_disclaimer", text: "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.", title: "Terms of Use", }, ], publisher: { category: "vendor", contact_details: "https://access.redhat.com/security/team/contact/", issuing_authority: "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", name: "Red Hat Product Security", namespace: "https://www.redhat.com", }, references: [ { category: "self", summary: "https://access.redhat.com/errata/RHSA-2024:1781", url: "https://access.redhat.com/errata/RHSA-2024:1781", }, { category: "external", summary: "https://access.redhat.com/security/updates/classification/#important", url: "https://access.redhat.com/security/updates/classification/#important", }, { category: "external", summary: "2263896", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2263896", }, { category: "external", summary: "2263897", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2263897", }, { category: "external", summary: "2263909", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2263909", }, { category: "external", summary: "2263911", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2263911", }, { category: "external", summary: "2263914", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2263914", }, { category: "external", summary: "2263917", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2263917", }, { category: "self", summary: "Canonical URL", url: "https://security.access.redhat.com/data/csaf/v2/advisories/2024/rhsa-2024_1781.json", }, ], title: "Red Hat Security Advisory: bind9.16 security update", tracking: { current_release_date: "2025-01-06T21:59:01+00:00", generator: { date: "2025-01-06T21:59:01+00:00", engine: { name: "Red Hat SDEngine", version: "4.2.5", }, }, id: "RHSA-2024:1781", initial_release_date: "2024-04-11T11:06:27+00:00", revision_history: [ { date: "2024-04-11T11:06:27+00:00", number: "1", summary: "Initial version", }, { date: "2024-04-11T11:06:27+00:00", number: "2", summary: "Last updated version", }, { date: "2025-01-06T21:59:01+00:00", number: "3", summary: "Last generated version", }, ], status: "final", version: "3", }, }, product_tree: { branches: [ { branches: [ { branches: [ { category: "product_name", name: "Red Hat Enterprise Linux AppStream (v. 8)", product: { name: "Red Hat Enterprise Linux AppStream (v. 8)", product_id: "AppStream-8.9.0.Z.MAIN", product_identification_helper: { cpe: "cpe:/a:redhat:enterprise_linux:8::appstream", }, }, }, { category: "product_name", name: "Red Hat CodeReady Linux Builder (v. 8)", product: { name: "Red Hat CodeReady Linux Builder (v. 8)", product_id: "CRB-8.9.0.Z.MAIN", product_identification_helper: { cpe: "cpe:/a:redhat:enterprise_linux:8::crb", }, }, }, ], category: "product_family", name: "Red Hat Enterprise Linux", }, { branches: [ { category: "product_version", name: "bind9.16-32:9.16.23-0.16.el8_9.2.src", 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This issue may allow a remote attacker with no specific privileges to craft a specially long DNS message leading to an excessive and uncontrolled CPU usage, the server being unavailable, and a Denial of Service.", title: "Vulnerability description", }, { category: "summary", text: "bind9: Parsing large DNS messages may cause excessive CPU load", title: "Vulnerability summary", }, { category: "other", text: "This vulnerability in the DNS message parsing code of BIND is of important severity due to its potential to cause excessive and uncontrolled CPU usage through specially crafted DNS queries or responses. The flaw exposes both authoritative DNS servers and recursive resolvers to Denial of Service (DoS) attacks, where an attacker can exploit the high computational complexity of the parsing routine to overwhelm the server. This can lead to significant degradation of service, rendering the DNS server unresponsive and disrupting network operations.", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.aarch64", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.ppc64le", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.s390x", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.src", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.x86_64", "AppStream-8.9.0.Z.MAIN:bind9.16-chroot-32:9.16.23-0.16.el8_9.2.aarch64", "AppStream-8.9.0.Z.MAIN:bind9.16-chroot-32:9.16.23-0.16.el8_9.2.ppc64le", "AppStream-8.9.0.Z.MAIN:bind9.16-chroot-32:9.16.23-0.16.el8_9.2.s390x", 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This is a result of a reachable assertion, leading `named` to prematurely terminate when both conditions are met: nxdomain-redirect for the queried domain is configured and the resolver receives a PTR query, used for a reverse DNS lookup, for a RFC 1918 address that would normally result in an authoritative `NXDOMAIN` response. A single query matching both conditions can lead to a Denial of Service in the named application.", title: "Vulnerability description", }, { category: "summary", text: "bind9: Querying RFC 1918 reverse zones may cause an assertion failure when “nxdomain-redirect” is enabled", title: "Vulnerability summary", }, { category: "other", text: "The vulnerability in the bind package represents a important severity issue due to its potential to cause a Denial of Service (DoS) in the named DNS server. This flaw arises from a reachable assertion that triggers a premature termination of the named process when specific conditions are met: a domain configured with nxdomain-redirect and a PTR query for an RFC 1918 address. This scenario can lead to a complete failure of the DNS resolution service, disrupting network operations and availability. Given that DNS services are fundamental for network communication and resource accessibility, such an exploit could result in significant service outages, impacting both internal and external systems reliant on the affected DNS server.", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.aarch64", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.ppc64le", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.s390x", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.src", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.x86_64", "AppStream-8.9.0.Z.MAIN:bind9.16-chroot-32:9.16.23-0.16.el8_9.2.aarch64", 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This issue may allow an attacker to query in a DNS64 enabled resolver node with a domain name triggering a server-stale data, triggering a code assertion, and resulting in a crash of `named` processes. This can allow a remote unauthenticated user to cause a Denial Of Service in the DNS server.", title: "Vulnerability description", }, { category: "summary", text: "bind9: Enabling both DNS64 and serve-stale may cause an assertion failure during recursive resolution", title: "Vulnerability summary", }, { category: "other", text: "The identified vulnerability in the BIND DNS server poses a important severity risk due to its potential to induce a Denial of Service (DoS) through a targeted exploitation of DNS64 functionality. Specifically, the flaw allows an attacker to send a crafted domain query that triggers a code assertion failure within the named process. This leads to a crash of the DNS server, disrupting its ability to resolve queries and maintain network operations. As a result, the DNS service becomes unavailable to legitimate users, impacting the integrity and availability of network services and potentially disrupting business operations or network communications. The exploitation of this vulnerability by an unauthenticated remote user underscores the urgent need for immediate patching and mitigation to safeguard DNS infrastructure against service outages.", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.aarch64", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.ppc64le", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.s390x", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.src", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.x86_64", "AppStream-8.9.0.Z.MAIN:bind9.16-chroot-32:9.16.23-0.16.el8_9.2.aarch64", "AppStream-8.9.0.Z.MAIN:bind9.16-chroot-32:9.16.23-0.16.el8_9.2.ppc64le", 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To maintain its efficiency when running as a recursive name resolver, `named` performs a cache database clean up under certain conditions. This issue may allow an attacker to craft a continuous set of crafted queries, which can induce `named` to trigger the cleanup process with a high frequency, making the internal cleanup items queue to grow indefinitely. This can lead to an uncontrolled memory consumption and resource starvation, potentially making `named` consume all available memory in the host, leading to a Denial of Service of the targeted system.", title: "Vulnerability description", }, { category: "summary", text: "bind9: Specific recursive query patterns may lead to an out-of-memory condition", title: "Vulnerability summary", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.aarch64", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.ppc64le", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.s390x", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.src", 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title: "bind9: Specific recursive query patterns may lead to an out-of-memory condition", }, { cve: "CVE-2023-50387", cwe: { id: "CWE-400", name: "Uncontrolled Resource Consumption", }, discovery_date: "2024-02-12T00:00:00+00:00", ids: [ { system_name: "Red Hat Bugzilla ID", text: "2263914", }, ], notes: [ { category: "description", text: "Processing specially crafted responses coming from DNSSEC-signed zones can lead to uncontrolled CPU usage, leading to a Denial of Service in the DNSSEC-validating resolver side.\r\n\r\nThis vulnerability applies only for systems where DNSSEC validation is enabled.", title: "Vulnerability description", }, { category: "summary", text: "bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator", title: "Vulnerability summary", }, { category: "other", text: "This vulnerability in DNSSEC-validating resolvers is of important severity because it can lead to uncontrolled CPU consumption, resulting in a Denial of Service (DoS). By exploiting this flaw, attackers can send specially crafted DNS responses that cause the resolver to enter a state of excessive resource utilization. This can severely impact the availability and performance of DNS services, affecting not only the targeted resolver but potentially cascading to other dependent systems and services.", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.aarch64", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.ppc64le", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.s390x", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.src", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.x86_64", "AppStream-8.9.0.Z.MAIN:bind9.16-chroot-32:9.16.23-0.16.el8_9.2.aarch64", "AppStream-8.9.0.Z.MAIN:bind9.16-chroot-32:9.16.23-0.16.el8_9.2.ppc64le", 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title: "bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator", }, { cve: "CVE-2023-50868", cwe: { id: "CWE-400", name: "Uncontrolled Resource Consumption", }, discovery_date: "2024-02-12T00:00:00+00:00", ids: [ { system_name: "Red Hat Bugzilla ID", text: "2263917", }, ], notes: [ { category: "description", text: "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.\r\n\r\nThis vulnerability applies only for systems where DNSSEC validation is enabled.", title: "Vulnerability description", }, { category: "summary", text: "bind9: Preparing an NSEC3 closest encloser proof can exhaust CPU resources", title: "Vulnerability summary", }, { category: "other", text: "The vulnerability in BIND9 that leads to CPU exhaustion through a flood of DNSSEC responses with NSEC3 signatures is a important severity issue due to its potential to induce a Denial of Service (DoS) condition on affected resolvers. By exploiting this flaw, an attacker can overwhelm a DNSSEC-enabled resolver with computationally intensive tasks, depleting CPU resources and disrupting normal DNS operations. This can result in significant service outages, affecting the resolver's ability to process legitimate DNS queries and thereby compromising network availability and reliability. The impact is exacerbated in high-traffic environments or where DNSSEC validation is extensively employed, making prompt remediation essential to prevent operational disruptions and maintain DNS infrastructure integrity.", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.aarch64", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.ppc64le", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.s390x", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.src", "AppStream-8.9.0.Z.MAIN:bind9.16-32:9.16.23-0.16.el8_9.2.x86_64", "AppStream-8.9.0.Z.MAIN:bind9.16-chroot-32:9.16.23-0.16.el8_9.2.aarch64", 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"https://access.redhat.com/security/cve/CVE-2023-50868", }, { category: "external", summary: "RHBZ#2263917", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2263917", }, { category: "external", summary: "https://www.cve.org/CVERecord?id=CVE-2023-50868", url: "https://www.cve.org/CVERecord?id=CVE-2023-50868", }, { category: "external", summary: "https://nvd.nist.gov/vuln/detail/CVE-2023-50868", url: "https://nvd.nist.gov/vuln/detail/CVE-2023-50868", }, { category: "external", summary: "https://blog.powerdns.com/2024/02/13/powerdns-recursor-4-8-6-4-9-3-5-0-2-released", url: "https://blog.powerdns.com/2024/02/13/powerdns-recursor-4-8-6-4-9-3-5-0-2-released", }, { category: "external", summary: "https://kb.isc.org/docs/cve-2023-50868", url: "https://kb.isc.org/docs/cve-2023-50868", }, { category: "external", summary: "https://www.knot-resolver.cz/2024-02-13-knot-resolver-5.7.1.html", url: "https://www.knot-resolver.cz/2024-02-13-knot-resolver-5.7.1.html", }, ], release_date: 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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.