rhsa-2020:1716
Vulnerability from csaf_redhat
Published
2020-04-28 15:36
Modified
2024-11-22 14:18
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 Moderate. 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): * unbound: command injection with data coming from a specially crafted IPSECKEY answer (CVE-2019-18934) 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. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.2 Release Notes linked from 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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        "name": "Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)"
      },
      "discovery_date": "2019-11-26T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1776762"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A shell command injection vulnerability was discovered in the way unbound handles DNS queries for systems with a public key used for IPsec. When ipsecmod is enabled, a malicious DNS server could send a DNS reply which would be used during a following DNS query to execute shell commands with the privileges of the unbound process. The same attack could be performed by an attacker who can modify data transmitted over the network, before it reaches the unbound server, if DNSSEC is not used.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: command injection with data coming from a specially crafted IPSECKEY answer",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The versions of unbound as shipped in Red Hat Enterprise Linux 7 and 8 have `ipsecmod` disabled by default, even though it could be activated through the unbound-control command, it would only be executable by high-privilege users. Moreover, the `username` option is enabled, reducing the impact of a successful attack, and DNSSEC is used by default, preventing an attacker from modifying DNS packets on the wire. Finally, the default SELinux policies prevent unbound from running any shell command.",
          "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"
        }
      ],
      "product_status": {
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2019-18934"
        },
        {
          "category": "external",
          "summary": "RHBZ#1776762",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1776762"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2019-18934",
          "url": "https://www.cve.org/CVERecord?id=CVE-2019-18934"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-18934",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-18934"
        },
        {
          "category": "external",
          "summary": "https://nlnetlabs.nl/downloads/unbound/CVE-2019-18934.txt",
          "url": "https://nlnetlabs.nl/downloads/unbound/CVE-2019-18934.txt"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/news/2019/Nov/19/unbound-1.9.5-released/",
          "url": "https://www.nlnetlabs.nl/news/2019/Nov/19/unbound-1.9.5-released/"
        }
      ],
      "release_date": "2019-11-26T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2020-04-28T15:36:34+00:00",
          "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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          "url": "https://access.redhat.com/errata/RHSA-2020:1716"
        },
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          "category": "workaround",
          "details": "* Do not enable ipsecmod in the unbound.conf configuration file nor via unbound-control, if DNSSEC based Opportunistic IPsec is not used.\n* Use the `username` option in unbound.conf to make unbound drop privileges and reduce the impact of a successful attack.\n* Enable SELinux to prevent unbound from executing shell commands, apart from the expected one specified in the `ipsecmod-hook` option.",
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            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.6,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "unbound: command injection with data coming from a specially crafted IPSECKEY answer"
    }
  ]
}


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