CVE-2023-26151: Asyncua Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-gfvq-mxw3-mfq3
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CVSS 7.5
CWE-835
Published
Advisory Summary

CVE-2023-26151 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')) affecting Asyncua libraries in the PyPI ecosystem. The issue involves asyncua vulnerable to denial of service via infinite loop. Remediation is available by upgrading affected packages to version 0.9.96.

CVE-2023-26151 at a Glance

CVE Identifier CVE-2023-26151
GHSA Identifier GHSA-gfvq-mxw3-mfq3
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
Affected Product Asyncua
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2023-26151

To remediate this vulnerability, upgrade all affected Asyncua dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

asyncua fixed: 0.9.96 
pip install asyncua>=0.9.96
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show asyncua

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2023-26151, inspect your installed packages using pip:

pip show asyncua

Analyze the terminal output to locate any version of Asyncua in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.9.96), your application is affected.

Note: The pip show asyncua command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop'), where the product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. In Asyncua, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Versions of the package asyncua before 0.9.96 are vulnerable to Denial of Service (DoS) such that an attacker can send a malformed packet and as a result, the server will enter into an infinite loop and consume excessive memory.

CVE-2023-26151 Affected Asyncua Versions

1 component(s)
Fixed Versions:
0.9.96
Product / Package Ecosystem Affected Versions Fixed Version
asyncua
pypi/asyncua
PyPI
< 0.9.96
0.9.96

References

Asyncua Release RELEASE
https://github.com/FreeOpcUa/opcua-asyncio/releases/tag/v0.9.96
Asyncua Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/asyncua/PYSEC-2023-190.yaml
Asyncua Security Information SECURITY
https://security.snyk.io/vuln/SNYK-PYTHON-ASYNCUA-5673709
NVD — CVE-2023-26151 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-26151
Asyncua Source Repository REPOSITORY
https://github.com/FreeOpcUa/opcua-asyncio/issues/1013
Asyncua Source Repository REPOSITORY
https://github.com/FreeOpcUa/opcua-asyncio/pull/1039
Security Fix Commit FIX COMMIT
https://github.com/FreeOpcUa/opcua-asyncio/commit/f6603daa34a93a658f0e176cb0b9ee5a6643b262
Asyncua Source Repository REPOSITORY
https://gist.github.com/artfire52/1540b234350795e0ecb4d672608dbec8
Asyncua Source Repository REPOSITORY
https://github.com/FreeOpcUa/opcua-asyncio

Frequently Asked Questions

What is CVE-2023-26151?
CVE-2023-26151 is a security vulnerability in Asyncua involving asyncua vulnerable to denial of service via infinite loop under CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop').
Which Asyncua versions are affected?
Affected versions include releases prior to 0.9.96 across affected packages: asyncua.
What version fixes CVE-2023-26151?
Upgrading to 0.9.96 (or the latest patched release for your respective branch) resolves the vulnerability.
Is asyncua affected?
Yes, asyncua is affected in releases prior to 0.9.96. Upgrade your dependency to 0.9.96 or later.
What is the CVSS score of CVE-2023-26151?
CVE-2023-26151 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2023-26151?
CVE-2023-26151 is classified under CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') (The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.).
How can I check PyPI dependencies for CVE-2023-26151?
Run the dependency tree command: 'pip show asyncua'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-gfvq-mxw3-mfq3",
  "modified" : "2023-10-04T19:34:19Z",
  "published" : "2023-10-03T06:30:26Z",
  "aliases" : [ "CVE-2023-26151" ],
  "summary" : "asyncua vulnerable to denial of service via infinite loop",
  "details" : "Versions of the package asyncua before 0.9.96 are vulnerable to Denial of Service (DoS) such that an attacker can send a malformed packet and as a result, the server will enter into an infinite loop and consume excessive memory.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "asyncua"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.9.96"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-26151"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FreeOpcUa/opcua-asyncio/issues/1013"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FreeOpcUa/opcua-asyncio/pull/1039"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FreeOpcUa/opcua-asyncio/commit/f6603daa34a93a658f0e176cb0b9ee5a6643b262"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/artfire52/1540b234350795e0ecb4d672608dbec8"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/FreeOpcUa/opcua-asyncio"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FreeOpcUa/opcua-asyncio/releases/tag/v0.9.96"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/asyncua/PYSEC-2023-190.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://security.snyk.io/vuln/SNYK-PYTHON-ASYNCUA-5673709"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-835" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-10-04T14:19:07Z",
    "nvd_published_at" : "2023-10-03T05:15:50Z"
  }
}