rhsa-2024_2368
Vulnerability from csaf_redhat
Published
2024-04-30 09:42
Modified
2024-11-06 05:42
Summary
Red Hat Security Advisory: mod_http2 security update

Notes

Topic
An update for mod_http2 is now available for Red Hat Enterprise Linux 9. 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 mod_http2 Apache httpd module implements the HTTP2 protocol (h2+h2c) on top of libnghttp2 for httpd 2.4 servers. Security Fix(es): * httpd: mod_http2: DoS in HTTP/2 with initial window size 0 (CVE-2023-43622) * mod_http2: reset requests exhaust memory (incomplete fix of CVE-2023-44487) (CVE-2023-45802) 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 9.4 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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        "text": "An update for mod_http2 is now available for Red Hat Enterprise Linux 9.\n\nRed 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.",
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      "cwe": {
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        "name": "Uncontrolled Resource Consumption"
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      "discovery_date": "2023-10-19T00:00:00+00:00",
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          "text": "2245153"
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      "notes": [
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          "category": "description",
          "text": "A flaw was found in the mod_http2 module of httpd. This flaw allows an attacker opening an HTTP/2 connection with an initial window size of 0 to block handling of that connection indefinitely. This vulnerability can exhaust worker resources in the server, similar to the well-known \"slow loris\" attack pattern.",
          "title": "Vulnerability description"
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          "text": "httpd: mod_http2: DoS in HTTP/2 with initial window size 0",
          "title": "Vulnerability summary"
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          "text": "This flaw only affects configurations with mod_http2 loaded and being used. Also, if there is no HTTP2 server configured, the httpd server is not affected and no further mitigation is needed.\n\nThe httpd mod_http2 module is enabled by default on Red Hat Enterprise Linux 8 and 9 via the mod_http2 package. However, there is no HTTP2 server configured by default.",
          "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-2023-43622"
        },
        {
          "category": "external",
          "summary": "RHBZ#2245153",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2245153"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2023-43622",
          "url": "https://www.cve.org/CVERecord?id=CVE-2023-43622"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-43622",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-43622"
        },
        {
          "category": "external",
          "summary": "https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2023-43622",
          "url": "https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2023-43622"
        }
      ],
      "release_date": "2023-10-10T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2024-04-30T09:42:20+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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          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2024:2368"
        },
        {
          "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.",
          "product_ids": [
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          ]
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "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",
            "version": "3.1"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "httpd: mod_http2: DoS in HTTP/2 with initial window size 0"
    },
    {
      "cve": "CVE-2023-45802",
      "cwe": {
        "id": "CWE-400",
        "name": "Uncontrolled Resource Consumption"
      },
      "discovery_date": "2023-10-13T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2243877"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in mod_http2. When a HTTP/2 stream is reset (RST frame) by a client, there is a time window were the request\u0027s memory resources were not reclaimed immediately. Instead, de-allocation was deferred to connection close. A client could send new requests and resets, keeping the connection busy and open, causing the memory footprint to keep on growing. On connection close, all resources are reclaimed but the process might run out of memory before connection close.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "mod_http2: reset requests exhaust memory (incomplete fix of CVE-2023-44487)",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "During \"normal\" HTTP/2 use, the probability of encountering this issue is very low. The kept memory would not become noticeable before the connection closes or times out.",
          "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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          "url": "https://access.redhat.com/security/cve/CVE-2023-45802"
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          "category": "external",
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2023-45802",
          "url": "https://www.cve.org/CVERecord?id=CVE-2023-45802"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-45802",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-45802"
        },
        {
          "category": "external",
          "summary": "https://httpd.apache.org/security/vulnerabilities_24.html",
          "url": "https://httpd.apache.org/security/vulnerabilities_24.html"
        }
      ],
      "release_date": "2023-10-19T00:00:00+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2024-04-30T09:42:20+00:00",
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            "baseSeverity": "HIGH",
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            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
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            "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": "Moderate"
        }
      ],
      "title": "mod_http2: reset requests exhaust memory (incomplete fix of CVE-2023-44487)"
    }
  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
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