CVE-2022-31117: Ujson Potential Double Free Of Buffer Vulnerability

MODERATE
Advisory Identifier: GHSA-fm67-cv37-96ff
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CVSS 5.9
CWE-415
Published
Advisory Summary

CVE-2022-31117 is a MODERATE (CVSS 5.9) potential double free of buffer vulnerability (CWE-415: Double Free) affecting Ujson libraries in the PyPI ecosystem. The issue involves potential double free of buffer during string decoding. Remediation is available by upgrading affected packages to version 5.4.0.

CVE-2022-31117 at a Glance

CVE Identifier CVE-2022-31117
GHSA Identifier GHSA-fm67-cv37-96ff
Severity MODERATE
CVSS v3.1 Base Score 5.9
CWE Classification CWE-415: Double Free
Affected Product Ujson
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.9

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

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
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-2022-31117

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

ujson fixed: 5.4.0 
pip install ujson>=5.4.0
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 ujson

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2022-31117, inspect your installed packages using pip:

pip show ujson

Analyze the terminal output to locate any version of Ujson in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.4.0), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-415: Double Free, where the product calls free() twice on the same memory address. In Ujson, 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

### Impact _What kind of vulnerability is it? Who is impacted?_ When an error occurs while reallocating the buffer for string decoding, the buffer gets freed twice. Due to how UltraJSON uses the internal decoder, this double free is impossible to trigger from Python. ### Patches _Has the problem been patched? What versions should users upgrade to?_ Users should upgrade to UltraJSON 5.4.0. ### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_ There is no workaround. ### For more information If you have any questions or comments about this advisory: * Open an issue in [UltraJSON](http://github.com/ultrajson/ultrajson/issues)

CVE-2022-31117 Affected Ujson Versions

1 component(s)
Fixed Versions:
5.4.0
Product / Package Ecosystem Affected Versions Fixed Version
ujson
pypi/ujson
PyPI
< 5.4.0
5.4.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/ultrajson/ultrajson/security/advisories/GHSA-fm67-cv37-96ff
NVD — CVE-2022-31117 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-31117
Security Fix Commit FIX COMMIT
https://github.com/ultrajson/ultrajson/commit/9c20de0f77b391093967e25d01fb48671104b15b
Ujson Source Repository REPOSITORY
https://github.com/ultrajson/ultrajson
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NAU5N4A7EUK2AMUCOLYDD5ARXAJYZBD2
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OPPU5FZP3LCTXYORFH7NHUMYA5X66IA7

Frequently Asked Questions

What is CVE-2022-31117?
CVE-2022-31117 is a security vulnerability in Ujson involving Potential double free of buffer during string decoding under CWE-415: Double Free.
Which Ujson versions are affected?
Affected versions include releases prior to 5.4.0 across affected packages: ujson.
What version fixes CVE-2022-31117?
Upgrading to 5.4.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is ujson affected?
Yes, ujson is affected in releases prior to 5.4.0. Upgrade your dependency to 5.4.0 or later.
What is the CVSS score of CVE-2022-31117?
CVE-2022-31117 has a CVSS v3.1 base score of 5.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2022-31117?
CVE-2022-31117 is classified under CWE-415: Double Free (The product calls free() twice on the same memory address.).
How can I check PyPI dependencies for CVE-2022-31117?
Run the dependency tree command: 'pip show ujson'. 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-fm67-cv37-96ff",
  "modified" : "2022-07-15T20:48:04Z",
  "published" : "2022-07-05T21:05:59Z",
  "aliases" : [ "CVE-2022-31117" ],
  "summary" : "Potential double free of buffer during string decoding",
  "details" : "### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nWhen an error occurs while reallocating the buffer for string decoding, the buffer gets freed twice.\n\nDue to how UltraJSON uses the internal decoder, this double free is impossible to trigger from Python.\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\nUsers should upgrade to UltraJSON 5.4.0.\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\nThere is no workaround.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [UltraJSON](http://github.com/ultrajson/ultrajson/issues)\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
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      "name" : "ujson"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
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      }, {
        "fixed" : "5.4.0"
      } ]
    } ]
  } ],
  "references" : [ {
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  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-31117"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ultrajson/ultrajson/commit/9c20de0f77b391093967e25d01fb48671104b15b"
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    "url" : "https://github.com/ultrajson/ultrajson"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NAU5N4A7EUK2AMUCOLYDD5ARXAJYZBD2"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OPPU5FZP3LCTXYORFH7NHUMYA5X66IA7"
  } ],
  "database_specific" : {
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    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-07-05T21:05:59Z",
    "nvd_published_at" : "2022-07-05T18:15:00Z"
  }
}