Vulnerability-Lookup

VAR-202110-0393

Vulnerability from variot - Updated: 2024-08-14 14:18

An Improper Input Validation vulnerability in J-Web of Juniper Networks Junos OS allows a locally authenticated J-Web attacker to escalate their privileges to root over the target device. This issue affects: Juniper Networks Junos OS All versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R3-S3; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2, 21.1R3; 21.2 versions prior to 21.2R1-S1, 21.2R2;

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CVE-2021-31372 (GCVE-0-2021-31372)

Vulnerability from cvelistv5 – Published: 2021-10-19 18:17 – Updated: 2024-09-16 20:47

Title

Junos OS: J-Web allows a locally authenticated attacker to escalate their privileges to root.

Summary

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-20 - Improper Input Validation
Privilege Escalation

Assigner

juniper mitre root

References

1 reference

URL	Tags
https://kb.juniper.net/JSA11237	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
Juniper Networks	Junos OS	Affected: unspecified , < 18.3R3-S5 (custom) Affected: 18.4 , < 18.4R3-S9 (custom) Affected: 19.1 , < 19.1R3-S6 (custom) Affected: 19.2 , < 19.2R3-S3 (custom) Affected: 19.3 , < 19.3R3-S3 (custom) Affected: 19.4 , < 19.4R3-S5 (custom) Affected: 20.1 , < 20.1R3-S1 (custom) Affected: 20.2 , < 20.2R3-S2 (custom) Affected: 20.3 , < 20.3R3-S1 (custom) Affected: 20.4 , < 20.4R3 (custom) Affected: 21.1 , < 21.1R2, 21.1R3 (custom) Affected: 21.2 , < 21.2R1-S1, 21.2R2 (custom)

Date Public

2021-10-13 00:00

Credits

Andy Coles of Microsoft MSRC Vulnerabilities and Mitigations Team

Show details on NVD website

JSON

To clipboard

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              "version": "19.3",
              "versionType": "custom"
            },
            {
              "lessThan": "19.4R3-S5",
              "status": "affected",
              "version": "19.4",
              "versionType": "custom"
            },
            {
              "lessThan": "20.1R3-S1",
              "status": "affected",
              "version": "20.1",
              "versionType": "custom"
            },
            {
              "lessThan": "20.2R3-S2",
              "status": "affected",
              "version": "20.2",
              "versionType": "custom"
            },
            {
              "lessThan": "20.3R3-S1",
              "status": "affected",
              "version": "20.3",
              "versionType": "custom"
            },
            {
              "lessThan": "20.4R3",
              "status": "affected",
              "version": "20.4",
              "versionType": "custom"
            },
            {
              "lessThan": "21.1R2, 21.1R3",
              "status": "affected",
              "version": "21.1",
              "versionType": "custom"
            },
            {
              "lessThan": "21.2R1-S1, 21.2R2",
              "status": "affected",
              "version": "21.2",
              "versionType": "custom"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "The examples of the config stanza affected by this issue:\n\n  [system services web-management]\n  [system services web-management https]"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Andy Coles of Microsoft MSRC Vulnerabilities and Mitigations Team"
        }
      ],
      "datePublic": "2021-10-13T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "An Improper Input Validation vulnerability in J-Web of Juniper Networks Junos OS allows a locally authenticated J-Web attacker to escalate their privileges to root over the target device. This issue affects: Juniper Networks Junos OS All versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R3-S3; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2, 21.1R3; 21.2 versions prior to 21.2R1-S1, 21.2R2;"
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
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          "descriptions": [
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              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "description": "Privilege Escalation",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-10-19T18:17:06.000Z",
        "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
        "shortName": "juniper"
      },
      "references": [
        {
          "tags": [
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          ],
          "url": "https://kb.juniper.net/JSA11237"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "The following software releases have been updated to resolve this specific issue: 18.3R3-S5, 18.4R3-S9, 19.1R3-S6, 19.2R3-S3, 19.3R3-S3, 19.4R3-S5, 20.1R3-S1, 20.2R3-S2, 20.3R3-S1, 20.4R3, 21.1R2, 21.1R3, 21.2R1-S1, 21.2R2, 21.3R1, and all subsequent releases."
        }
      ],
      "source": {
        "advisory": "JSA11237",
        "defect": [
          "1594516"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "Junos OS: J-Web allows a locally authenticated attacker to escalate their privileges to root.",
      "workarounds": [
        {
          "lang": "en",
          "value": "To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to only trusted administrative networks, hosts and users.\n\nAlternatively, J-Web can be disabled."
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "sirt@juniper.net",
          "DATE_PUBLIC": "2021-10-13T16:00:00.000Z",
          "ID": "CVE-2021-31372",
          "STATE": "PUBLIC",
          "TITLE": "Junos OS: J-Web allows a locally authenticated attacker to escalate their privileges to root."
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Junos OS",
                      "version": {
                        "version_data": [
                          {
                            "version_affected": "\u003c",
                            "version_value": "18.3R3-S5"
                          },
                          {
                            "version_affected": "\u003c",
                            "version_name": "18.4",
                            "version_value": "18.4R3-S9"
                          },
                          {
                            "version_affected": "\u003c",
                            "version_name": "19.1",
                            "version_value": "19.1R3-S6"
                          },
                          {
                            "version_affected": "\u003c",
                            "version_name": "19.2",
                            "version_value": "19.2R3-S3"
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                          {
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                            "version_value": "19.3R3-S3"
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                            "version_value": "19.4R3-S5"
                          },
                          {
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                            "version_name": "20.1",
                            "version_value": "20.1R3-S1"
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                          {
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                            "version_name": "20.2",
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                          },
                          {
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                            "version_name": "20.3",
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                          },
                          {
                            "version_affected": "\u003c",
                            "version_name": "20.4",
                            "version_value": "20.4R3"
                          },
                          {
                            "version_affected": "\u003c",
                            "version_name": "21.1",
                            "version_value": "21.1R2, 21.1R3"
                          },
                          {
                            "version_affected": "\u003c",
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        "configuration": [
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          }
        ],
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          }
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            }
          ]
        },
        "exploit": [
          {
            "lang": "en",
            "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": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-20 Improper Input Validation"
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            },
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "Privilege Escalation"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://kb.juniper.net/JSA11237",
              "refsource": "CONFIRM",
              "url": "https://kb.juniper.net/JSA11237"
            }
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        },
        "solution": [
          {
            "lang": "en",
            "value": "The following software releases have been updated to resolve this specific issue: 18.3R3-S5, 18.4R3-S9, 19.1R3-S6, 19.2R3-S3, 19.3R3-S3, 19.4R3-S5, 20.1R3-S1, 20.2R3-S2, 20.3R3-S1, 20.4R3, 21.1R2, 21.1R3, 21.2R1-S1, 21.2R2, 21.3R1, and all subsequent releases."
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            "value": "To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to only trusted administrative networks, hosts and users.\n\nAlternatively, J-Web can be disabled."
          }
        ]
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
    "assignerShortName": "juniper",
    "cveId": "CVE-2021-31372",
    "datePublished": "2021-10-19T18:17:06.961Z",
    "dateReserved": "2021-04-15T00:00:00.000Z",
    "dateUpdated": "2024-09-16T20:47:42.111Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Action not permitted

VAR-202110-0393

CVE-2021-31372 (GCVE-0-2021-31372)

Tags

Sightings

Nomenclature

Related by attack behaviour