rhsa-2024_1751
Vulnerability from csaf_redhat
Published
2024-04-11 10:26
Modified
2024-09-16 18:13
Summary
Red Hat Security Advisory: unbound security update
Notes
Topic
An update for unbound 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 unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.
Security Fix(es):
* 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* 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.\n\nTo 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:\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 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)\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.",
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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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