Vulnerability-Lookup

CVE-2023-28803 (GCVE-0-2023-28803)

Vulnerability from cvelistv5 – Published: 2023-10-23 13:32 – Updated: 2024-09-11 14:31

Title

Traffic being bypassed by ZCC by configuring synthetic IP range as local network

Summary

An authentication bypass by spoofing of a device with a synthetic IP address is possible in Zscaler Client Connector on Windows, allowing a functionality bypass. This issue affects Client Connector: before 3.9.

Severity

5.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-11 14:16 UTC

CWE

CWE-290 - Authentication Bypass by Spoofing

Assigner

Zscaler mitre root

References

1 reference

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

Impacted products

1 product

Vendor	Product	Version	CPE status
Zscaler	Client Connector	Affected: 0 , < 3.9 (custom)	guessed

Credits

Regions Bank Red Team

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2023-28803

Vulnerability from fkie_nvd - Published: 2023-10-23 14:15 - Updated: 2026-06-17 05:48

Severity

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

Summary

References

	URL	Tags
	cve@zscaler.com	https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023	Release Notes
	af854a3a-2127-422b-91ae-364da2661108	https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023	Release Notes

Impacted products

	Vendor	Product	Version
	zscaler	client_connector	*

JSON

To clipboard

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          "defaultStatus": "unaffected",
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  "lastModified": "2026-06-17T05:48:48.363",
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GHSA-MWVW-6GGJ-FHV5

Vulnerability from github – Published: 2023-10-23 15:30 – Updated: 2024-04-04 08:53

Details

Severity

5.9 (Medium)


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

Show details on source website

JSON

To clipboard

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  "affected": [],
  "aliases": [
    "CVE-2023-28803"
  ],
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-10-23T14:15:09Z",
    "severity": "MODERATE"
  },
  "details": "An authentication bypass by spoofing of a device with a synthetic IP address is possible in Zscaler Client Connector on Windows, allowing a functionality bypass. This issue affects Client Connector: before 3.9.\n\n",
  "id": "GHSA-mwvw-6ggj-fhv5",
  "modified": "2024-04-04T08:53:09Z",
  "published": "2023-10-23T15:30:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-28803"
    },
    {
      "type": "WEB",
      "url": "https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GSD-2023-28803

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

Details

Aliases

CVE-2023-28803

Aliases

CVE-2023-28803

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2023-28803",
    "id": "GSD-2023-28803"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
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        "CVE-2023-28803"
      ],
      "details": "An authentication bypass by spoofing of a device with a synthetic IP address is possible in Zscaler Client Connector on Windows, allowing a functionality bypass. This issue affects Client Connector: before 3.9.\n\n",
      "id": "GSD-2023-28803",
      "modified": "2023-12-13T01:20:47.937172Z",
      "schema_version": "1.4.0"
    }
  },
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                    "version": {
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                ]
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          }
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          }
        ]
      },
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            ],
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}

WID-SEC-W-2023-2733

Vulnerability from csaf_certbund - Published: 2023-10-23 22:00 - Updated: 2023-10-23 22:00

Summary

ZScaler Client Connector: Mehrere Schwachstellen

Severity

Hoch

Scope

12 vulnerabilities in this advisory, including CVE-2023-28803.

CVE-2023-28803

Es besteht eine Schwachstelle im ZScaler Client Connector. Durch Spoofing eines Geräts mit einer synthetischen IP-Adresse kann ein Angreifer diese Schwachstelle ausnutzen, um Sicherheitsmaßnahmen zu umgehen.

Known affected: 2 products

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-2023-28803 (GCVE-0-2023-28803)

FKIE_CVE-2023-28803

GHSA-MWVW-6GGJ-FHV5

GSD-2023-28803

WID-SEC-W-2023-2733

Tags

Sightings

Nomenclature

Related by attack behaviour