VDE-2022-003

Vulnerability from csaf_beckhoffautomationgmbhcokg - Published: 2022-03-01 12:34 - Updated: 2025-06-05 13:28
Summary
BECKHOFF: Null Pointer Dereference vulnerability in products with OPC UA technology
Notes
Summary: By tricking clients of the mentioned products into contacting malicious OPC UA servers and thereby acting as OPC UA clients, a crash of the component can be provoked.
Impact: The mentioned products can be used as clients which contact an OPC UA server. If such connection is made with SecurityMode=None for the connection then the client can receive a malformed message during the conversation which provokes a null pointer dereference within the OPC UA stack of the product. The product crashes then by memory access violation. Though this is uncommon and not recommended, such connections with SecurityMode=None may even be used by OPC UA Servers, for example if they act as client to register at a Discovery Server.
Mitigation: Have your applications configured to use other than SecurityMode=None for all OPC UA connections. Avoid that these connect to an unknown OPC UA server with SecurityMode=None. In particular, avoid that your applications connect to servers which they discover via mDNS, a Local Discovery Server (LDS), an untrusted Global Discovery Server (GDS) or even trusted GDS using SecurityMode=none. Especially in the latter case an adversary might be able to apply the 'man in the middle' pattern to attack the connection and inject a bad message which triggers the vulnerability.
Remediation: Please update to a recent version of the affected product.
CVE-2021-45117

The OPC autogenerated ANSI C stack stubs (in the NodeSets) do not handle all error cases. This can lead to a NULL pointer dereference.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE-476 - NULL Pointer Dereference
Mitigation Have your applications configured to use other than SecurityMode=None for all OPC UA connections. Avoid that these connect to an unknown OPC UA server with SecurityMode=None. In particular, avoid that your applications connect to servers which they discover via mDNS, a Local Discovery Server (LDS), an untrusted Global Discovery Server (GDS) or even trusted GDS using SecurityMode=none. Especially in the latter case an adversary might be able to apply the 'man in the middle' pattern to attack the connection and inject a bad message which triggers the vulnerability.
Vendor Fix Please update to a recent version of the affected product.
References
Acknowledgments
CERT@VDE certvde.com
OPC Foundation
Unified Automation
To clipboard 

{
  "document": {
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        "category": "summary",
        "text": "By tricking clients of the mentioned products into contacting malicious OPC UA servers and thereby acting as OPC UA clients, a crash of the component can be provoked.",
        "title": "Summary"
      },
      {
        "category": "description",
        "text": "The mentioned products can be used as clients which contact an OPC UA server. If such connection is made with SecurityMode=None for the connection then the client can receive a malformed message during the conversation which provokes a null pointer dereference within the OPC UA stack of the product. The product crashes then by memory access violation. Though this is uncommon and not recommended, such connections with SecurityMode=None may even be used by OPC UA Servers, for example if they act as client to register at a Discovery Server.",
        "title": "Impact"
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      {
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        "text": "Have your applications configured to use other than SecurityMode=None for all OPC UA connections. Avoid that these connect to an unknown OPC UA server with SecurityMode=None. In particular, avoid that your applications connect to servers which they discover via mDNS, a Local Discovery Server (LDS), an untrusted Global Discovery Server (GDS) or even trusted GDS using SecurityMode=none. Especially in the latter case an adversary might be able to apply the \u0027man in the middle\u0027 pattern to attack the connection and inject a bad message which triggers the vulnerability.",
        "title": "Mitigation"
      },
      {
        "category": "description",
        "text": "Please update to a recent version of the affected product.",
        "title": "Remediation"
      }
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    "publisher": {
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        "summary": "VDE-2022-003: BECKHOFF: Null Pointer Dereference vulnerability in products with OPC UA technology - HTML",
        "url": "https://certvde.com/en/advisories/VDE-2022-003/"
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        "url": "https://certvde.com/en/advisories/vendor/beckhoff/"
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    ],
    "title": "BECKHOFF: Null Pointer Dereference vulnerability in products with OPC UA technology",
    "tracking": {
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          "CSAFPID-51004",
          "CSAFPID-51005",
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        "summary": "Affected products."
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  "vulnerabilities": [
    {
      "cve": "CVE-2021-45117",
      "cwe": {
        "id": "CWE-476",
        "name": "NULL Pointer Dereference"
      },
      "notes": [
        {
          "category": "description",
          "text": "The OPC autogenerated ANSI C stack stubs (in the NodeSets) do not handle all error cases. This can lead to a NULL pointer dereference.",
          "title": "Vulnerability Description"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-51001",
          "CSAFPID-51002",
          "CSAFPID-51003",
          "CSAFPID-51004",
          "CSAFPID-51005",
          "CSAFPID-51006",
          "CSAFPID-51007",
          "CSAFPID-51008",
          "CSAFPID-51009",
          "CSAFPID-510010",
          "CSAFPID-510011",
          "CSAFPID-510012"
        ]
      },
      "remediations": [
        {
          "category": "mitigation",
          "details": "Have your applications configured to use other than SecurityMode=None for all OPC UA connections. Avoid that these connect to an unknown OPC UA server with SecurityMode=None. In particular, avoid that your applications connect to servers which they discover via mDNS, a Local Discovery Server (LDS), an untrusted Global Discovery Server (GDS) or even trusted GDS using SecurityMode=none. Especially in the latter case an adversary might be able to apply the \u0027man in the middle\u0027 pattern to attack the connection and inject a bad message which triggers the vulnerability.",
          "group_ids": [
            "CSAFGID-0001"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Please update to a recent version of the affected product.",
          "group_ids": [
            "CSAFGID-0001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "environmentalScore": 6.5,
            "environmentalSeverity": "MEDIUM",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 6.5,
            "temporalSeverity": "MEDIUM",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-51001",
            "CSAFPID-51002",
            "CSAFPID-51003",
            "CSAFPID-51004",
            "CSAFPID-51005",
            "CSAFPID-51006",
            "CSAFPID-51007",
            "CSAFPID-51008",
            "CSAFPID-51009",
            "CSAFPID-510010",
            "CSAFPID-510011",
            "CSAFPID-510012"
          ]
        }
      ],
      "title": "CVE-2021-45117"
    }
  ]
}


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Sightings

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  • 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.
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  • 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.