MSRC_CVE-2021-46828

Vulnerability from csaf_microsoft - Published: 2022-07-02 00:00 - Updated: 2022-08-02 00:00
Summary
In libtirpc before 1.3.3rc1 remote attackers could exhaust the file descriptors of a process that uses libtirpc because idle TCP connections are mishandled. This can in turn lead to an svc_run infinite loop without accepting new connections.

Notes

Additional Resources
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer
The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
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{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2021-46828 In libtirpc before 1.3.3rc1 remote attackers could exhaust the file descriptors of a process that uses libtirpc because idle TCP connections are mishandled. This can in turn lead to an svc_run infinite loop without accepting new connections. - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2022/msrc_cve-2021-46828.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "In libtirpc before 1.3.3rc1 remote attackers could exhaust the file descriptors of a process that uses libtirpc because idle TCP connections are mishandled. This can in turn lead to an svc_run infinite loop without accepting new connections.",
    "tracking": {
      "current_release_date": "2022-08-02T00:00:00.000Z",
      "generator": {
        "date": "2025-10-19T23:43:30.812Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2021-46828",
      "initial_release_date": "2022-07-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2022-08-02T00:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "1.0",
                "product": {
                  "name": "CBL Mariner 1.0",
                  "product_id": "16820"
                }
              },
              {
                "category": "product_version",
                "name": "2.0",
                "product": {
                  "name": "CBL Mariner 2.0",
                  "product_id": "17086"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003ccm1 libtirpc 1.1.4-5",
                "product": {
                  "name": "\u003ccm1 libtirpc 1.1.4-5",
                  "product_id": "2"
                }
              },
              {
                "category": "product_version",
                "name": "cm1 libtirpc 1.1.4-5",
                "product": {
                  "name": "cm1 libtirpc 1.1.4-5",
                  "product_id": "18872"
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003ccbl2 libtirpc 1.3.3-1",
                "product": {
                  "name": "\u003ccbl2 libtirpc 1.3.3-1",
                  "product_id": "1"
                }
              },
              {
                "category": "product_version",
                "name": "cbl2 libtirpc 1.3.3-1",
                "product": {
                  "name": "cbl2 libtirpc 1.3.3-1",
                  "product_id": "18873"
                }
              }
            ],
            "category": "product_name",
            "name": "libtirpc"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "\u003ccm1 libtirpc 1.1.4-5 as a component of CBL Mariner 1.0",
          "product_id": "16820-2"
        },
        "product_reference": "2",
        "relates_to_product_reference": "16820"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "cm1 libtirpc 1.1.4-5 as a component of CBL Mariner 1.0",
          "product_id": "18872-16820"
        },
        "product_reference": "18872",
        "relates_to_product_reference": "16820"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "\u003ccbl2 libtirpc 1.3.3-1 as a component of CBL Mariner 2.0",
          "product_id": "17086-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17086"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "cbl2 libtirpc 1.3.3-1 as a component of CBL Mariner 2.0",
          "product_id": "18873-17086"
        },
        "product_reference": "18873",
        "relates_to_product_reference": "17086"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-46828",
      "cwe": {
        "id": "CWE-755",
        "name": "Improper Handling of Exceptional Conditions"
      },
      "notes": [
        {
          "category": "general",
          "text": "mitre",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "fixed": [
          "18872-16820",
          "18873-17086"
        ],
        "known_affected": [
          "16820-2",
          "17086-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2021-46828 In libtirpc before 1.3.3rc1 remote attackers could exhaust the file descriptors of a process that uses libtirpc because idle TCP connections are mishandled. This can in turn lead to an svc_run infinite loop without accepting new connections. - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2022/msrc_cve-2021-46828.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2022-08-02T00:00:00.000Z",
          "details": "1.1.4-5:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
          "product_ids": [
            "16820-2"
          ],
          "url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
        },
        {
          "category": "vendor_fix",
          "date": "2022-08-02T00:00:00.000Z",
          "details": "1.3.3-1:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
          "product_ids": [
            "17086-1"
          ],
          "url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "environmentalsScore": 0.0,
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 7.5,
            "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"
          },
          "products": [
            "16820-2",
            "17086-1"
          ]
        }
      ],
      "title": "In libtirpc before 1.3.3rc1 remote attackers could exhaust the file descriptors of a process that uses libtirpc because idle TCP connections are mishandled. This can in turn lead to an svc_run infinite loop without accepting new connections."
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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