Vulnerability-Lookup

CVE-2023-28806 (GCVE-0-2023-28806)

Vulnerability from cvelistv5 – Published: 2024-08-06 15:41 – Updated: 2024-08-06 17:30

Title

Signature validation error in DLL allows disabling anti-tampering protection

Summary

An Improper Validation of signature in Zscaler Client Connector on Windows allows an authenticated user to disable anti-tampering. This issue affects Client Connector on Windows <4.2.0.190.

Severity

5.7 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-08-06 17:14 UTC

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

Zscaler mitre root

References

1 reference

URL	Tags
https://help.zscaler.com/client-connector/client-…

Impacted products

2 products

Vendor	Product	Version	CPE status
Zscaler	Client Connector	Affected: 0 , < 4.2.0.190 (custom)	guessed
zscaler	client_connector	Affected: 0 , < 4.2.0.190 (custom) cpe:2.3:a:zscaler:client_connector::::::windows::*

Credits

Equinor Red Team

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2023-28806

Vulnerability from fkie_nvd - Published: 2024-08-06 16:15 - Updated: 2026-06-17 05:48

Severity

5.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Summary

An Improper Validation of signature in Zscaler Client Connector on Windows allows an authenticated user to disable anti-tampering. This issue affects Client Connector on Windows <4.2.0.190.

References

	URL	Tags
	cve@zscaler.com	https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023?applicable_category=windows&applicable_version=4.2.0.190	Vendor Advisory

Impacted products

	Vendor	Product	Version
	zscaler	client_connector	*

JSON

To clipboard

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    {
      "lang": "en",
      "value": "An Improper Validation of signature in Zscaler Client Connector on Windows allows an authenticated user to disable anti-tampering. This issue affects Client Connector on Windows \u003c4.2.0.190."
    },
    {
      "lang": "es",
      "value": "Una validaci\u00f3n incorrecta de la firma en Zscaler Client Connector en Windows permite a un usuario autenticado desactivar la manipulaci\u00f3n. Este problema afecta a Client Connector en Windows \u0026lt;4.2.0.190."
    }
  ],
  "id": "CVE-2023-28806",
  "lastModified": "2026-06-17T05:48:48.743",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 5.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 0.5,
        "impactScore": 5.2,
        "source": "cve@zscaler.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2023-28806",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-08-06T17:14:09.944551Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-08-06T16:15:46.453",
  "references": [
    {
      "source": "cve@zscaler.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023?applicable_category=windows\u0026applicable_version=4.2.0.190"
    }
  ],
  "sourceIdentifier": "cve@zscaler.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "cve@zscaler.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

GHSA-HRW8-HPF8-7Q72

Vulnerability from github – Published: 2024-08-06 18:30 – Updated: 2024-08-06 18:30

Details

An Improper Validation of signature in Zscaler Client Connector on Windows allows an authenticated user to disable anti-tampering. This issue affects Client Connector on Windows <4.2.0.190.

Severity

5.7 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2023-28806"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-08-06T16:15:46Z",
    "severity": "MODERATE"
  },
  "details": "An Improper Validation of signature in Zscaler Client Connector on Windows allows an authenticated user to disable anti-tampering. This issue affects Client Connector on Windows \u003c4.2.0.190.",
  "id": "GHSA-hrw8-hpf8-7q72",
  "modified": "2024-08-06T18:30:56Z",
  "published": "2024-08-06T18:30:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-28806"
    },
    {
      "type": "WEB",
      "url": "https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023?applicable_category=windows\u0026applicable_version=4.2.0.190"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GSD-2023-28806

Vulnerability from gsd - Updated: 2023-12-13 01:20

Details

** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.

Aliases

CVE-2023-28806

Aliases

CVE-2023-28806

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2023-28806",
    "id": "GSD-2023-28806"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2023-28806"
      ],
      "id": "GSD-2023-28806",
      "modified": "2023-12-13T01:20:48.493410Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@mitre.org",
        "ID": "CVE-2023-28806",
        "STATE": "RESERVED"
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided."
          }
        ]
      }
    }
  }
}

WID-SEC-W-2024-1779

Vulnerability from csaf_certbund - Published: 2024-08-06 22:00 - Updated: 2024-08-06 22:00

Summary

ZScaler Client Connector: Mehrere Schwachstellen

Severity

Mittel

Scope

6 vulnerabilities in this advisory, including CVE-2023-28806.

CVE-2023-28806

Es bestehen mehrere Schwachstellen in ZScaler Client Connector. Diese Fehler sind auf eine unsachgemäße Signaturvalidierung zurückzuführen, durch die der Manipulationsschutz deaktiviert werden kann. Ein lokaler Angreifer könnte diese Schwachstelle nutzen, um Sicherheitsmaßnahmen zu umgehen.

Open the full advisory

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.

Action not permitted

CVE-2023-28806 (GCVE-0-2023-28806)

FKIE_CVE-2023-28806

GHSA-HRW8-HPF8-7Q72

GSD-2023-28806

WID-SEC-W-2024-1779

Tags

Sightings

Nomenclature

Related by attack behaviour