rhsa-2024_1801
Vulnerability from csaf_redhat
Published
2024-04-15 01:30
Modified
2024-09-16 18:14
Summary
Red Hat Security Advisory: unbound security update
Notes
Topic
An update for unbound is now available for Red Hat Enterprise Linux 9.0 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.
Details
The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.
Security Fix(es):
* 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)
* A vulnerability was found in Unbound due to incorrect default permissions,
allowing any process outside the unbound group to modify the unbound runtime
configuration. The default combination of the "control-use-cert: no" option with
either explicit or implicit use of an IP address in the "control-interface"
option could allow improper access. If a process can connect over localhost to
port 8953, it can alter the configuration of unbound.service. This flaw allows
an unprivileged local process to manipulate a running instance, potentially
altering forwarders, allowing them to track all queries forwarded by the local
resolver, and, in some cases, disrupting resolving altogether.
To mitigate the vulnerability, a new file
"/etc/unbound/conf.d/remote-control.conf" has been added and included in the
main unbound configuration file, "unbound.conf". The file contains two
directives that should limit access to unbound.conf:
control-interface: "/run/unbound/control"
control-use-cert: "yes"
For details about these directives, run "man unbound.conf".
Updating to the version of unbound provided by this advisory should, in most
cases, address the vulnerability. To verify that your configuration is not
vulnerable, use the "unbound-control status | grep control" command. If the
output contains "control(ssl)" or "control(namedpipe)", your configuration is
not vulnerable. If the command output returns only "control", the configuration
is vulnerable because it does not enforce access only to the unbound group
members. To fix your configuration, add the line "include:
/etc/unbound/conf.d/remote-control.conf" to the end of the file
"/etc/unbound/unbound.conf". If you use a custom
"/etc/unbound/conf.d/remote-control.conf" file, add the new directives to this
file. (CVE-2024-1488)
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.
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"text": "The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver. \n\nSecurity Fix(es):\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\n* A vulnerability was found in Unbound due to incorrect default permissions,\nallowing any process outside the unbound group to modify the unbound runtime\nconfiguration. The default combination of the \"control-use-cert: no\" option with\neither explicit or implicit use of an IP address in the \"control-interface\"\noption could allow improper access. If a process can connect over localhost to\nport 8953, it can alter the configuration of unbound.service. This flaw allows\nan unprivileged local process to manipulate a running instance, potentially\naltering forwarders, allowing them to track all queries forwarded by the local\nresolver, and, in some cases, disrupting resolving altogether.\n\nTo mitigate the vulnerability, a new file\n\"/etc/unbound/conf.d/remote-control.conf\" has been added and included in the\nmain unbound configuration file, \"unbound.conf\". The file contains two\ndirectives that should limit access to unbound.conf:\n\n control-interface: \"/run/unbound/control\"\n control-use-cert: \"yes\"\n\nFor details about these directives, run \"man unbound.conf\".\n\nUpdating to the version of unbound provided by this advisory should, in most\ncases, address the vulnerability. To verify that your configuration is not\nvulnerable, use the \"unbound-control status | grep control\" command. If the\noutput contains \"control(ssl)\" or \"control(namedpipe)\", your configuration is\nnot vulnerable. If the command output returns only \"control\", the configuration\nis vulnerable because it does not enforce access only to the unbound group\nmembers. To fix your configuration, add the line \"include:\n/etc/unbound/conf.d/remote-control.conf\" to the end of the file\n\"/etc/unbound/unbound.conf\". If you use a custom\n\"/etc/unbound/conf.d/remote-control.conf\" file, add the new directives to this\nfile. (CVE-2024-1488)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE page(s)\nlisted in the References section.",
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"text": "2263914"
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"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\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2023-50387"
},
{
"category": "external",
"summary": "RHBZ#2263914",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2263914"
},
{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2023-50387"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-50387",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-50387"
},
{
"category": "external",
"summary": "https://blog.powerdns.com/2024/02/13/powerdns-recursor-4-8-6-4-9-3-5-0-2-released",
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{
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{
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{
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"details": "Important"
}
],
"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\u0027s 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\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "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": "2024-02-13T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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{
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"details": "Important"
}
],
"title": "bind9: Preparing an NSEC3 closest encloser proof can exhaust CPU resources"
},
{
"cve": "CVE-2024-1488",
"cwe": {
"id": "CWE-15",
"name": "External Control of System or Configuration Setting"
},
"discovery_date": "2024-02-14T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2264183"
}
],
"notes": [
{
"category": "description",
"text": "A vulnerability was found in Unbound due to incorrect default permissions, allowing any process outside the unbound group to modify the unbound runtime configuration. If a process can connect over localhost to port 8953, it can alter the configuration of unbound.service. This flaw allows an unprivileged attacker to manipulate a running instance, potentially altering forwarders, allowing them to track all queries forwarded by the local resolver, and, in some cases, disrupting resolving altogether.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "unbound: unrestricted reconfiguration enabled to anyone that may lead to local privilege escalation",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "While the vulnerability in Unbound\u0027s default permissions presents a significant security concern, it may not necessarily be classified as a critical severity issue but rather as an important one due to several factors. Firstly, the vulnerability requires local access to the system, limiting its exploitability compared to critical vulnerabilities that can be remotely exploited. Additionally, the impact of the vulnerability, while potentially severe in terms of allowing unauthorized modification of Unbound\u0027s configuration and potential disruption of DNS resolution, may not directly lead to immediate and widespread compromise of sensitive data or critical system functionality. However, it remains important due to the potential for privacy violations, redirection of traffic, and disruption of services, especially considering the central role of DNS in network communication.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2024-1488"
},
{
"category": "external",
"summary": "RHBZ#2264183",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2264183"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2024-1488",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-1488"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2024-1488",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-1488"
}
],
"release_date": "2024-02-13T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
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"url": "https://access.redhat.com/errata/RHSA-2024:1801"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options don\u0027t meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
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"scores": [
{
"cvss_v3": {
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 8.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "unbound: unrestricted reconfiguration enabled to anyone that may lead to local privilege escalation"
}
]
}
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