Vulnerability-Lookup

GSD-2021-30116

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021. By default Kaseya VSA on premise offers a download page where the clients for the installation can be downloaded. The default URL for this page is https://x.x.x.x/dl.asp When an attacker download a client for Windows and installs it, the file KaseyaD.ini is generated (C:\Program Files (x86)\Kaseya\XXXXXXXXXX\KaseyaD.ini) which contains an Agent_Guid and AgentPassword This Agent_Guid and AgentPassword can be used to log in on dl.asp (https://x.x.x.x/dl.asp?un=840997037507813&pw=113cc622839a4077a84837485ced6b93e440bf66d44057713cb2f95e503a06d9) This request authenticates the client and returns a sessionId cookie that can be used in subsequent attacks to bypass authentication. Security issues discovered --- * Unauthenticated download page leaks credentials * Credentials of agent software can be used to obtain a sessionId (cookie) that can be used for services not intended for use by agents * dl.asp accepts credentials via a GET request * Access to KaseyaD.ini gives an attacker access to sufficient information to penetrate the Kaseya installation and its clients. Impact --- Via the page /dl.asp enough information can be obtained to give an attacker a sessionId that can be used to execute further (semi-authenticated) attacks against the system.

Aliases

CVE-2021-30116

Aliases

CVE-2021-30116

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-30116",
    "description": "Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021.",
    "id": "GSD-2021-30116"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-30116"
      ],
      "details": "Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021. By default Kaseya VSA on premise offers a download page where the clients for the installation can be downloaded. The default URL for this page is https://x.x.x.x/dl.asp When an attacker download a client for Windows and installs it, the file KaseyaD.ini is generated (C:\\Program Files (x86)\\Kaseya\\XXXXXXXXXX\\KaseyaD.ini) which contains an Agent_Guid and AgentPassword This Agent_Guid and AgentPassword can be used to log in on dl.asp (https://x.x.x.x/dl.asp?un=840997037507813\u0026pw=113cc622839a4077a84837485ced6b93e440bf66d44057713cb2f95e503a06d9) This request authenticates the client and returns a sessionId cookie that can be used in subsequent attacks to bypass authentication. Security issues discovered --- * Unauthenticated download page leaks credentials * Credentials of agent software can be used to obtain a sessionId (cookie) that can be used for services not intended for use by agents * dl.asp accepts credentials via a GET request * Access to KaseyaD.ini gives an attacker access to sufficient information to penetrate the Kaseya installation and its clients. Impact --- Via the page /dl.asp enough information can be obtained to give an attacker a sessionId that can be used to execute further (semi-authenticated) attacks against the system.",
      "id": "GSD-2021-30116",
      "modified": "2023-12-13T01:23:30.765532Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cisa.gov": {
      "cveID": "CVE-2021-30116",
      "dateAdded": "2021-11-03",
      "dueDate": "2021-11-17",
      "product": "Kaseya VSA",
      "requiredAction": "Apply updates per vendor instructions.",
      "shortDescription": "Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021.",
      "vendorProject": "Kaseya",
      "vulnerabilityName": "Kaseya VSA Remote Code Execution Vulnerability"
    },
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@mitre.org",
        "ID": "CVE-2021-30116",
        "STATE": "PUBLIC",
        "TITLE": "Unauthenticated credential leak and business logic flaw in Kaseya VSA \u003c= v9.5.6"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "n/a",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "n/a"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "n/a"
            }
          ]
        }
      },
      "credit": [
        {
          "lang": "eng",
          "value": "Discovered by Wietse Boonstra of DIVD"
        },
        {
          "lang": "eng",
          "value": "Additional research by Frank Breedijk of DIVD"
        }
      ],
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021. By default Kaseya VSA on premise offers a download page where the clients for the installation can be downloaded. The default URL for this page is https://x.x.x.x/dl.asp When an attacker download a client for Windows and installs it, the file KaseyaD.ini is generated (C:\\Program Files (x86)\\Kaseya\\XXXXXXXXXX\\KaseyaD.ini) which contains an Agent_Guid and AgentPassword This Agent_Guid and AgentPassword can be used to log in on dl.asp (https://x.x.x.x/dl.asp?un=840997037507813\u0026pw=113cc622839a4077a84837485ced6b93e440bf66d44057713cb2f95e503a06d9) This request authenticates the client and returns a sessionId cookie that can be used in subsequent attacks to bypass authentication. Security issues discovered --- * Unauthenticated download page leaks credentials * Credentials of agent software can be used to obtain a sessionId (cookie) that can be used for services not intended for use by agents * dl.asp accepts credentials via a GET request * Access to KaseyaD.ini gives an attacker access to sufficient information to penetrate the Kaseya installation and its clients. Impact --- Via the page /dl.asp enough information can be obtained to give an attacker a sessionId that can be used to execute further (semi-authenticated) attacks against the system."
          }
        ]
      },
      "generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "impact": {
        "cvss": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 10,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        }
      },
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                "value": "n/a"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/",
            "refsource": "CONFIRM",
            "url": "https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/"
          },
          {
            "name": "https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021",
            "refsource": "CONFIRM",
            "url": "https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021"
          },
          {
            "name": "https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/",
            "refsource": "CONFIRM",
            "url": "https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/"
          },
          {
            "name": "https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/",
            "refsource": "MISC",
            "url": "https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/"
          }
        ]
      },
      "solution": [
        {
          "lang": "eng",
          "value": "Upgrade to a version after 9.5.6"
        }
      ],
      "source": {
        "advisory": "DIVD-2021-00011",
        "discovery": "INTERNAL"
      }
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:kaseya:vsa_agent:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "9.5.0.24",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:kaseya:vsa_server:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "9.5.7a",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2021-30116"
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021. By default Kaseya VSA on premise offers a download page where the clients for the installation can be downloaded. The default URL for this page is https://x.x.x.x/dl.asp When an attacker download a client for Windows and installs it, the file KaseyaD.ini is generated (C:\\Program Files (x86)\\Kaseya\\XXXXXXXXXX\\KaseyaD.ini) which contains an Agent_Guid and AgentPassword This Agent_Guid and AgentPassword can be used to log in on dl.asp (https://x.x.x.x/dl.asp?un=840997037507813\u0026pw=113cc622839a4077a84837485ced6b93e440bf66d44057713cb2f95e503a06d9) This request authenticates the client and returns a sessionId cookie that can be used in subsequent attacks to bypass authentication. Security issues discovered --- * Unauthenticated download page leaks credentials * Credentials of agent software can be used to obtain a sessionId (cookie) that can be used for services not intended for use by agents * dl.asp accepts credentials via a GET request * Access to KaseyaD.ini gives an attacker access to sufficient information to penetrate the Kaseya installation and its clients. Impact --- Via the page /dl.asp enough information can be obtained to give an attacker a sessionId that can be used to execute further (semi-authenticated) attacks against the system."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-522"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/",
              "refsource": "MISC",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/"
            },
            {
              "name": "https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/",
              "refsource": "MISC",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/"
            },
            {
              "name": "https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021",
              "refsource": "MISC",
              "tags": [
                "Vendor Advisory"
              ],
              "url": "https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021"
            },
            {
              "name": "https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/",
              "refsource": "MISC",
              "tags": [],
              "url": "https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 7.5,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 6.4,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "HIGH",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2023-10-23T14:15Z",
      "publishedDate": "2021-07-09T14:15Z"
    }
  }
}

CVE-2021-30116 (GCVE-0-2021-30116)

Vulnerability from cvelistv5 – Published: 2021-07-09 00:00 – Updated: 2026-08-14 03:55

Title

Unauthenticated credential leak and business logic flaw in Kaseya VSA <= v9.5.6

Summary

Severity

10 (Critical)


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

SSVC

Exploitation: active Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2021-07-06 00:00 UTC

CWE

n/a
CWE-522 - Insufficiently Protected Credentials

Assigner

mitre mitre root

References

5 references

URL	Tags
https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/
https://helpdesk.kaseya.com/hc/en-gb/articles/440…
https://csirt.divd.nl/2021/07/07/Kaseya-Limited-D…
https://www.secpod.com/blog/kaseya-vsa-zero-day-b…
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Credits

Discovered by Wietse Boonstra of DIVD Additional research by Frank Breedijk of DIVD

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T22:24:59.326Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
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            "url": "https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/"
          },
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            "url": "https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-30116",
                "options": [
                  {
                    "Exploitation": "active"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2021-07-06T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          },
          {
            "other": {
              "content": {
                "dateAdded": "2021-11-03",
                "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30116"
              },
              "type": "kev"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-522",
                "description": "CWE-522 Insufficiently Protected Credentials",
                "lang": "en",
                "type": "CWE"
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            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-14T03:55:30.740Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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        "references": [
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            "value": "CVE-2021-30116 added to CISA KEV"
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        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "vendor": "n/a",
          "versions": [
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      "credits": [
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          "lang": "en",
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        },
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      "descriptions": [
        {
          "lang": "en",
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        }
      ],
      "metrics": [
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 10,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
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              "lang": "en",
              "type": "text"
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          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-10-23T13:12:39.540Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
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      "references": [
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          "url": "https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/"
        },
        {
          "url": "https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021"
        },
        {
          "url": "https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/"
        },
        {
          "url": "https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to a version after 9.5.6"
        }
      ],
      "source": {
        "advisory": "DIVD-2021-00011",
        "discovery": "INTERNAL"
      },
      "title": "Unauthenticated credential leak and business logic flaw in Kaseya VSA \u003c= v9.5.6",
      "x_generator": {
        "engine": "Vulnogram 0.0.9"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2021-30116",
    "datePublished": "2021-07-09T00:00:00.000Z",
    "dateReserved": "2021-04-02T00:00:00.000Z",
    "dateUpdated": "2026-08-14T03:55:30.740Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.