RHSA-2024:1690
Vulnerability from csaf_redhat
Published
2024-04-08 09:21
Modified
2025-11-21 18:58
Summary
Red Hat Security Advisory: varnish security update

Notes

Topic
An update for varnish 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
Varnish Cache is a high-performance HTTP accelerator. It stores web pages in memory so web servers don't have to create the same web page over and over again, giving the website a significant speed up. Security Fix(es): * varnish: HTTP/2 Broken Window Attack may result in denial of service (CVE-2024-30156) 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 flaw was found in the Varnish cache server, with HTTP/2 support enabled, that may allow a Denial of Service type of attack. A malicious actor can cause the server to run out of credits during the HTTP/2 connection control flow. As a consequence, the server will stop to properly process the active HTTP streams, retaining the already allocated resources, leading to resource starvation.",
          "title": "Vulnerability description"
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          "text": "varnish: HTTP/2 Broken Window Attack may result in denial of service",
          "title": "Vulnerability summary"
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          "text": "CVE-2024-30156 represents a important severity issue due to its potential to cause widespread denial of service (DoS) across Varnish Cacher servers with HTTP/2 protocol enabled. By exploiting this vulnerability, attackers can exhaust the server\u0027s HTTP/2 connection control flow window credits, thereby halting the processing of streams and indefinitely retaining associated resources. This can lead to a complete service outage, impacting the availability and performance of web services relying on Varnish Cache. Given the prevalence of HTTP/2 adoption for its performance benefits, the vulnerability poses a significant risk to web infrastructure, necessitating immediate mitigation measures to prevent exploitation and mitigate the impact on affected systems.",
          "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.",
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2024-30156"
        },
        {
          "category": "external",
          "summary": "RHBZ#2271486",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2271486"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2024-30156",
          "url": "https://www.cve.org/CVERecord?id=CVE-2024-30156"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2024-30156",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-30156"
        },
        {
          "category": "external",
          "summary": "https://varnish-cache.org/security/VSV00014.html",
          "url": "https://varnish-cache.org/security/VSV00014.html"
        }
      ],
      "release_date": "2024-03-24T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2024-04-08T09:21:57+00:00",
          "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "category": "none"
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "varnish: HTTP/2 Broken Window Attack may result in denial of service"
    }
  ]
}


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