gsd-2021-31618
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released.
Aliases
Aliases
CVE-2021-31618


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-31618",
    "description": "Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released.",
    "id": "GSD-2021-31618",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-31618.html",
      "https://www.debian.org/security/2021/dsa-4937",
      "https://advisories.mageia.org/CVE-2021-31618.html",
      "https://security.archlinux.org/CVE-2021-31618"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-31618"
      ],
      "details": "Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released.",
      "id": "GSD-2021-31618",
      "modified": "2023-12-13T01:23:12.929683Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security@apache.org",
        "ID": "CVE-2021-31618",
        "STATE": "PUBLIC",
        "TITLE": "NULL pointer dereference on specially crafted HTTP/2 request"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Apache HTTP Server",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "=",
                          "version_value": "2.4.47"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Apache Software Foundation"
            }
          ]
        }
      },
      "credit": [
        {
          "lang": "eng",
          "value": "Apache HTTP server would like to thank  LI ZHI XIN from NSFocus for reporting this."
        }
      ],
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
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          {
            "lang": "eng",
            "value": "Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released."
          }
        ]
      },
      "generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "impact": [
        {
          "other": "important"
        }
      ],
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-476 NULL Pointer Dereference"
              }
            ]
          }
        ]
      },
      "references": {
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            "name": "http://httpd.apache.org/security/vulnerabilities_24.html",
            "refsource": "MISC",
            "url": "http://httpd.apache.org/security/vulnerabilities_24.html"
          },
          {
            "name": "[oss-security] 20210609 CVE-2021-31618: Apache httpd: NULL pointer dereference on specially crafted HTTP/2 request",
            "refsource": "MLIST",
            "url": "http://www.openwall.com/lists/oss-security/2021/06/10/9"
          },
          {
            "name": "https://seclists.org/oss-sec/2021/q2/206",
            "refsource": "MISC",
            "url": "https://seclists.org/oss-sec/2021/q2/206"
          },
          {
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            "refsource": "MLIST",
            "url": "https://lists.apache.org/thread.html/r14b66ef0f4f569fd515a3f96cd4eb58bd9a8ff525cc326bb0359664f@%3Ccvs.httpd.apache.org%3E"
          },
          {
            "name": "[httpd-cvs] 20210615 svn commit: r1075782 - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_24.html",
            "refsource": "MLIST",
            "url": "https://lists.apache.org/thread.html/r783b6558abf3305b17ea462bed4bd66d82866438999bf38cef6d11d1@%3Ccvs.httpd.apache.org%3E"
          },
          {
            "name": "FEDORA-2021-051639aad4",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2NKJ3ZA3FTSZ2QBBPKS6BYGAWYRABNQQ/"
          },
          {
            "name": "FEDORA-2021-181f29c392",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A73QJ4HPUMU26I6EULG6SCK67TUEXZYR/"
          },
          {
            "name": "[debian-lts-announce] 20210709 [SECURITY] [DLA 2706-1] apache2 security update",
            "refsource": "MLIST",
            "url": "https://lists.debian.org/debian-lts-announce/2021/07/msg00006.html"
          },
          {
            "name": "DSA-4937",
            "refsource": "DEBIAN",
            "url": "https://www.debian.org/security/2021/dsa-4937"
          },
          {
            "name": "GLSA-202107-38",
            "refsource": "GENTOO",
            "url": "https://security.gentoo.org/glsa/202107-38"
          },
          {
            "name": "https://www.oracle.com/security-alerts/cpuoct2021.html",
            "refsource": "MISC",
            "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
          },
          {
            "name": "https://security.netapp.com/advisory/ntap-20210727-0008/",
            "refsource": "CONFIRM",
            "url": "https://security.netapp.com/advisory/ntap-20210727-0008/"
          }
        ]
      },
      "source": {
        "discovery": "UNKNOWN"
      },
      "work_around": [
        {
          "lang": "eng",
          "value": "On unpatched servers, the `h2` protocol can be disabled by removing it from the `Protocols` configuration. If the `h2` protocol is not enabled, the server is not affected by this vulnerability."
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:apache:http_server:1.15.17:*:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:apache:http_server:2.4.47:*:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
              }
            ],
            "operator": "OR"
          },
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
              }
            ],
            "operator": "OR"
          },
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
                "cpe_name": [],
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          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:*",
                "cpe_name": [],
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                "cpe_name": [],
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                "cpe_name": [],
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                "cpe_name": [],
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          "ID": "CVE-2021-31618"
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            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-476"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "http://httpd.apache.org/security/vulnerabilities_24.html",
              "refsource": "MISC",
              "tags": [
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            },
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            },
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              ],
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            },
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            },
            {
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              "refsource": "FEDORA",
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              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2NKJ3ZA3FTSZ2QBBPKS6BYGAWYRABNQQ/"
            },
            {
              "name": "[debian-lts-announce] 20210709 [SECURITY] [DLA 2706-1] apache2 security update",
              "refsource": "MLIST",
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                "Third Party Advisory"
              ],
              "url": "https://lists.debian.org/debian-lts-announce/2021/07/msg00006.html"
            },
            {
              "name": "DSA-4937",
              "refsource": "DEBIAN",
              "tags": [
                "Third Party Advisory"
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              "url": "https://www.debian.org/security/2021/dsa-4937"
            },
            {
              "name": "GLSA-202107-38",
              "refsource": "GENTOO",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://security.gentoo.org/glsa/202107-38"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20210727-0008/",
              "refsource": "CONFIRM",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://security.netapp.com/advisory/ntap-20210727-0008/"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpuoct2021.html",
              "refsource": "MISC",
              "tags": [
                "Patch",
                "Third Party Advisory"
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              "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 5.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "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"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2021-12-10T17:05Z",
      "publishedDate": "2021-06-15T09:15Z"
    }
  }
}


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