rhsa-2025:12520
Vulnerability from csaf_redhat
Published
2025-08-04 15:19
Modified
2025-08-11 08:59
Summary
Red Hat Security Advisory: unbound security update

Notes

Topic
An update for unbound is now available for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions. 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): * unbound: Unbound Cache poisoning (CVE-2025-5994) 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": "A cache poisoning flaw was found in Unbound. Resolvers supporting EDNS Client Subnet (ECS) must segregate outgoing queries to accommodate different outgoing ECS information. This issue reopens resolvers to a birthday paradox attack, known as the Rebirthday Attack, which attempts to match the DNS transaction ID with cache non-ECS poisoned replies.",
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          "text": "unbound: Unbound Cache poisoning",
          "title": "Vulnerability summary"
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          "text": "This vulnerability is considered Important rather than Moderate because it directly compromises the integrity of DNS caching mechanisms in resolvers supporting EDNS Client Subnet (ECS). The flaw allows an attacker to exploit the birthday paradox by generating a high volume of concurrent queries with different ECS values, thereby increasing the chance of a transaction ID collision with a spoofed response. If the resolver fails to properly segregate cache entries by ECS scope, it may accept and cache a malicious non-ECS response, effectively leading to DNS cache poisoning. Unlike typical poisoning attempts that require precise timing or privileged network positions, this attack can be carried out remotely with a high success rate, especially in resolvers that do not correctly isolate ECS queries.",
          "title": "Statement"
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          "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.",
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-5994"
        },
        {
          "category": "external",
          "summary": "RHBZ#2380949",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2380949"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-5994",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-5994"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-5994",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-5994"
        },
        {
          "category": "external",
          "summary": "https://nlnetlabs.nl/downloads/unbound/CVE-2025-5994.txt",
          "url": "https://nlnetlabs.nl/downloads/unbound/CVE-2025-5994.txt"
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      "release_date": "2025-07-16T14:38:22.738000+00:00",
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          "category": "vendor_fix",
          "date": "2025-08-04T15:19:32+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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            "baseScore": 7.5,
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            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "unbound: Unbound Cache poisoning"
    }
  ]
}


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