gsd-2021-0270
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
On PTX Series and QFX10k Series devices with the "inline-jflow" feature enabled, a use after free weakness in the Packet Forwarding Engine (PFE) microkernel architecture of Juniper Networks Junos OS may allow an attacker to cause a Denial of Service (DoS) condition whereby one or more Flexible PIC Concentrators (FPCs) may restart. As this is a race condition situation this issue become more likely to be hit when network instability occurs, such as but not limited to BGP/IGP reconvergences, and/or further likely to occur when more active "traffic flows" are occurring through the device. When this issue occurs, it will cause one or more FPCs to restart unexpectedly. During FPC restarts core files will be generated. While the core file is generated traffic will be disrupted. Sustained receipt of large traffic flows and reconvergence-like situations may sustain the Denial of Service (DoS) situation. This issue affects: Juniper Networks Junos OS: 18.1 version 18.1R2 and later versions prior to 18.1R3-S10 on PTX Series, QFX10K Series.
Aliases
Aliases
CVE-2021-0270


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-0270",
    "description": "On PTX Series and QFX10k Series devices with the \"inline-jflow\" feature enabled, a use after free weakness in the Packet Forwarding Engine (PFE) microkernel architecture of Juniper Networks Junos OS may allow an attacker to cause a Denial of Service (DoS) condition whereby one or more Flexible PIC Concentrators (FPCs) may restart. As this is a race condition situation this issue become more likely to be hit when network instability occurs, such as but not limited to BGP/IGP reconvergences, and/or further likely to occur when more active \"traffic flows\" are occurring through the device. When this issue occurs, it will cause one or more FPCs to restart unexpectedly. During FPC restarts core files will be generated. While the core file is generated traffic will be disrupted. Sustained receipt of large traffic flows and reconvergence-like situations may sustain the Denial of Service (DoS) situation. This issue affects: Juniper Networks Junos OS: 18.1 version 18.1R2 and later versions prior to 18.1R3-S10 on PTX Series, QFX10K Series.",
    "id": "GSD-2021-0270"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-0270"
      ],
      "details": "On PTX Series and QFX10k Series devices with the \"inline-jflow\" feature enabled, a use after free weakness in the Packet Forwarding Engine (PFE) microkernel architecture of Juniper Networks Junos OS may allow an attacker to cause a Denial of Service (DoS) condition whereby one or more Flexible PIC Concentrators (FPCs) may restart. As this is a race condition situation this issue become more likely to be hit when network instability occurs, such as but not limited to BGP/IGP reconvergences, and/or further likely to occur when more active \"traffic flows\" are occurring through the device. When this issue occurs, it will cause one or more FPCs to restart unexpectedly. During FPC restarts core files will be generated. While the core file is generated traffic will be disrupted. Sustained receipt of large traffic flows and reconvergence-like situations may sustain the Denial of Service (DoS) situation. This issue affects: Juniper Networks Junos OS: 18.1 version 18.1R2 and later versions prior to 18.1R3-S10 on PTX Series, QFX10K Series.",
      "id": "GSD-2021-0270",
      "modified": "2023-12-13T01:23:08.164167Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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      "CVE_data_meta": {
        "ASSIGNER": "sirt@juniper.net",
        "DATE_PUBLIC": "2021-04-14T16:00:00.000Z",
        "ID": "CVE-2021-0270",
        "STATE": "PUBLIC",
        "TITLE": "Junos OS: PTX Series, QFX10K Series: A PTX/QFX FPC may restart unexpectedly with the \"inline-Jflow\" feature enabled on a large-scale deployment"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Junos OS",
                    "version": {
                      "version_data": [
                        {
                          "platform": "PTX Series, QFX10K Series",
                          "version_affected": "\u003e=",
                          "version_name": "18.1",
                          "version_value": "18.1R2"
                        },
                        {
                          "platform": "PTX Series, QFX10K Series",
                          "version_affected": "!\u003c",
                          "version_name": "18.1",
                          "version_value": "18.1R3-S10"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Juniper Networks"
            }
          ]
        }
      },
      "configuration": [
        {
          "lang": "eng",
          "value": "The inline flow monitoring configuration can be broadly classified into the following categories:\n\nConfigurations at the [edit services flow-monitoring version-ipfix template] or [edit services flow-monitoring version9 template] hierarchy level\u2014At this level, you configure the template properties for inline flow monitoring.\nConfigurations at the [edit forwarding-options sampling instance] hierarchy level\u2014At this level, you configure a sampling instance and associate the template to the sampling instance. At this level, you also configure the flow-server IP address and port number as well as the autonomous system type.\nConfigurations at the [edit chassis fpc] hierarchy level\u2014At this level, you associate the sampling instance with the FPC on which the media interface is present.\nConfigurations at the [edit firewall] hierarchy level\u2014At this level you configure a firewall filter for the family of traffic to be sampled. You must attach this filter to the interface on which you want to sample the traffic.\n\nSee https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/inline-flow-monitoring-ptx.html for further details.\n"
        }
      ],
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "On PTX Series and QFX10k Series devices with the \"inline-jflow\" feature enabled, a use after free weakness in the Packet Forwarding Engine (PFE) microkernel architecture of Juniper Networks Junos OS may allow an attacker to cause a Denial of Service (DoS) condition whereby one or more Flexible PIC Concentrators (FPCs) may restart. As this is a race condition situation this issue become more likely to be hit when network instability occurs, such as but not limited to BGP/IGP reconvergences, and/or further likely to occur when more active \"traffic flows\" are occurring through the device. When this issue occurs, it will cause one or more FPCs to restart unexpectedly. During FPC restarts core files will be generated. While the core file is generated traffic will be disrupted. Sustained receipt of large traffic flows and reconvergence-like situations may sustain the Denial of Service (DoS) situation. This issue affects: Juniper Networks Junos OS: 18.1 version 18.1R2 and later versions prior to 18.1R3-S10 on PTX Series, QFX10K Series."
          }
        ]
      },
      "exploit": [
        {
          "lang": "eng",
          "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
        }
      ],
      "generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "impact": {
        "cvss": {
          "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"
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-362 Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization)"
              }
            ]
          },
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-416 Use After Free"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://kb.juniper.net/JSA11161",
            "refsource": "MISC",
            "url": "https://kb.juniper.net/JSA11161"
          },
          {
            "name": "https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/inline-flow-monitoring-ptx.html",
            "refsource": "MISC",
            "url": "https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/inline-flow-monitoring-ptx.html"
          }
        ]
      },
      "solution": [
        {
          "lang": "eng",
          "value": "The following software releases have been updated to resolve this specific issue: 16.1R7-S8, 17.2R3-S4, 17.3R3-S8, 17.4R2-S11, 17.4R3-S2, 18.1R3-S10, 18.2R1, and all subsequent releases."
        }
      ],
      "source": {
        "advisory": "JSA11161",
        "defect": [
          "1498427"
        ],
        "discovery": "USER"
      },
      "work_around": [
        {
          "lang": "eng",
          "value": "If you are susceptible to this issue and unable to upgrade to software with the fix, you can deploy a workaround by disabling the \u201cinline-flow\u201d feature.\n\nTo check for use and to disable the \u201cinline-jflow\u201d service on a device, see https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/inline-flow-monitoring-ptx.html for additional details.\n\nRemoving \u201cinline-jflow\u201d takes effect immediately and there is no need to restart the FPCs or the router. Once the feature is removed, the router no longer provides traffic data to the flow collector."
        }
      ]
    },
    "nvd.nist.gov": {
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          "ID": "CVE-2021-0270"
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          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 4.3,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
            "version": "2.0"
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          "exploitabilityScore": 8.6,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
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            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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          "exploitabilityScore": 2.2,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2021-04-28T18:09Z",
      "publishedDate": "2021-04-22T20:15Z"
    }
  }
}


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