CVE-2023-33977: Kiwitcms Cross-Site Scripting Vulnerability

HIGH
Advisory Identifier: GHSA-2fqm-m4r2-fh98
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CVSS 8.1
CWE-434 CWE-79
Published
Advisory Summary

CVE-2023-33977 is a HIGH (CVSS 8.1) cross-site scripting vulnerability (CWE-434: Unrestricted Upload of File with Dangerous Type) affecting Kiwitcms libraries in the PyPI ecosystem. The issue involves kiwitcms vulnerable to stored cross-site scripting via unrestricted file upload. Remediation is available by upgrading affected packages to version 12.4.

CVE-2023-33977 at a Glance

CVE Identifier CVE-2023-33977
GHSA Identifier GHSA-2fqm-m4r2-fh98
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-434: Unrestricted Upload of File with Dangerous Type
Affected Product Kiwitcms
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 8.1

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:R/S:U/C:H/I:H/A:N).

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

How to Fix CVE-2023-33977

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

kiwitcms fixed: 12.4 
pip install kiwitcms>=12.4
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 kiwitcms

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2023-33977, inspect your installed packages using pip:

pip show kiwitcms

Analyze the terminal output to locate any version of Kiwitcms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 12.4), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-434: Unrestricted Upload of File with Dangerous Type, where the product allows the upload or transfer of dangerous file types that are automatically processed within its environment. In Kiwitcms, 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 Kiwi TCMS allows users to upload attachments to test plans, test cases, etc. Earlier versions of Kiwi TCMS had introduced upload validators in order to prevent potentially dangerous files from being uploaded and Content-Security-Policy definition to prevent cross-site-scripting attacks. The upload validation checks were not 100% robust which left the possibility to circumvent them and upload a potentially dangerous file which allows execution of arbitrary JavaScript in the browser. Additionally we've discovered that Nginx's `proxy_pass` directive will strip some headers negating protections built into Kiwi TCMS when served behind a reverse proxy. ### Patches - Improved file upload validation code - Updated Nginx reverse proxy configuration for ***.tenant.kiwitcms.org** ### Workarounds If serving Kiwi TCMS behind a reverse proxy make sure that additional header values are still passed to the client browser. If they aren't redefine them inside the proxy configuration. See [etc/nginx.conf#L66-L68](https://github.com/kiwitcms/Kiwi/blob/master/etc/nginx.conf#L66-L68) and [etc/nginx.conf#L87](https://github.com/kiwitcms/Kiwi/blob/master/etc/nginx.conf#L87) ### References Disclosed by [M Nadeem Qazi](https://huntr.dev/bounties/6aea9a26-e29a-467b-aa5a-f767f0c2ec96/).

CVE-2023-33977 Affected Kiwitcms Versions

1 component(s)
Fixed Versions:
12.4
Product / Package Ecosystem Affected Versions Fixed Version
kiwitcms
pypi/kiwitcms
PyPI
< 12.4
12.4

References

Kiwitcms Security Information SECURITY
https://kiwitcms.org/blog/kiwi-tcms-team/2023/06/06/kiwi-tcms-124
GitHub Advisory / Wiki ADVISORY
https://github.com/kiwitcms/Kiwi/security/advisories/GHSA-2fqm-m4r2-fh98
NVD — CVE-2023-33977 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-33977
Security Fix Commit FIX COMMIT
https://github.com/kiwitcms/kiwi/commit/d789f4b51025de4f8c747c037d02e1b0da80b034
Kiwitcms Source Repository REPOSITORY
https://github.com/kiwitcms/Kiwi
Kiwitcms Source Repository REPOSITORY
https://github.com/kiwitcms/Kiwi/blob/master/etc/nginx.conf#L66-L68
Kiwitcms Source Repository REPOSITORY
https://github.com/kiwitcms/Kiwi/blob/master/etc/nginx.conf#L87
huntr.dev/bounties/6aea9a26-e... WEB
https://huntr.dev/bounties/6aea9a26-e29a-467b-aa5a-f767f0c2ec96

Frequently Asked Questions

What is CVE-2023-33977?
CVE-2023-33977 is a security vulnerability in Kiwitcms involving kiwitcms vulnerable to stored cross-site scripting via unrestricted file upload under CWE-434: Unrestricted Upload of File with Dangerous Type.
Which Kiwitcms versions are affected?
Affected versions include releases prior to 12.4 across affected packages: kiwitcms.
What version fixes CVE-2023-33977?
Upgrading to 12.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is kiwitcms affected?
Yes, kiwitcms is affected in releases prior to 12.4. Upgrade your dependency to 12.4 or later.
What is the CVSS score of CVE-2023-33977?
CVE-2023-33977 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2023-33977?
CVE-2023-33977 is classified under CWE-434: Unrestricted Upload of File with Dangerous Type (The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.).
How can I check PyPI dependencies for CVE-2023-33977?
Run the dependency tree command: 'pip show kiwitcms'. 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-2fqm-m4r2-fh98",
  "modified" : "2023-06-06T16:46:16Z",
  "published" : "2023-06-06T16:46:16Z",
  "aliases" : [ "CVE-2023-33977" ],
  "summary" : "kiwitcms vulnerable to stored cross-site scripting via unrestricted file upload",
  "details" : "### Impact\n\nKiwi TCMS allows users to upload attachments to test plans, test cases, etc. Earlier versions of Kiwi TCMS had introduced upload validators in order to prevent potentially dangerous files from being uploaded and Content-Security-Policy definition to prevent cross-site-scripting attacks. \n\nThe upload validation checks were not 100% robust which left the possibility to circumvent them and upload a potentially dangerous file which allows execution of arbitrary JavaScript in the browser. Additionally we've discovered that Nginx's `proxy_pass` directive will strip some headers negating protections built into Kiwi TCMS when served behind a reverse proxy.\n\n### Patches\n\n- Improved file upload validation code\n- Updated Nginx reverse proxy configuration for ***.tenant.kiwitcms.org**\n\n### Workarounds\n\nIf serving Kiwi TCMS behind a reverse proxy make sure that additional header values are still passed to the client browser. If they aren't redefine them inside the proxy configuration. See [etc/nginx.conf#L66-L68](https://github.com/kiwitcms/Kiwi/blob/master/etc/nginx.conf#L66-L68) and [etc/nginx.conf#L87](https://github.com/kiwitcms/Kiwi/blob/master/etc/nginx.conf#L87)\n\n### References\n\nDisclosed by [M Nadeem Qazi](https://huntr.dev/bounties/6aea9a26-e29a-467b-aa5a-f767f0c2ec96/).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "kiwitcms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "12.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 12.3"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/kiwitcms/Kiwi/security/advisories/GHSA-2fqm-m4r2-fh98"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-33977"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kiwitcms/kiwi/commit/d789f4b51025de4f8c747c037d02e1b0da80b034"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/kiwitcms/Kiwi"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kiwitcms/Kiwi/blob/master/etc/nginx.conf#L66-L68"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kiwitcms/Kiwi/blob/master/etc/nginx.conf#L87"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.dev/bounties/6aea9a26-e29a-467b-aa5a-f767f0c2ec96"
  }, {
    "type" : "WEB",
    "url" : "https://kiwitcms.org/blog/kiwi-tcms-team/2023/06/06/kiwi-tcms-124"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-434", "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-06-06T16:46:16Z",
    "nvd_published_at" : "2023-06-06T19:15:12Z"
  }
}