CVE-2022-23620: Xwiki platform skin skinx Path Traversal Vulnerability

MODERATE
Advisory Identifier: GHSA-7ph6-5cmq-xgjq
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CVSS 6.8
CWE-116 CWE-22
Published
Advisory Summary

CVE-2022-23620 is a MODERATE (CVSS 6.8) path traversal vulnerability (CWE-116: Improper Encoding or Escaping of Output) affecting Xwiki platform skin skinx libraries in the Maven ecosystem. The issue involves path traversal in xwiki-platform-skin-skinx. Remediation is available by upgrading affected packages to version 13.6.

CVE-2022-23620 at a Glance

CVE Identifier CVE-2022-23620
GHSA Identifier GHSA-7ph6-5cmq-xgjq
Severity MODERATE
CVSS v3.1 Base Score 6.8
CWE Classification CWE-116: Improper Encoding or Escaping of Output
Affected Product Xwiki platform skin skinx
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.8

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

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required High (PR:H)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability High (A:H)

How to Fix CVE-2022-23620

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

org.xwiki.platform:xwiki-platform-skin-skinx fixed: 13.6 
<dependency>
    <groupId>org.xwiki.platform</groupId>
    <artifactId>xwiki-platform-skin-skinx</artifactId>
    <version>13.6</version>
</dependency>
Verify Direct and Transitive Dependencies

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

mvn dependency:tree -Dincludes=org.xwiki.platform

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2022-23620, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.xwiki.platform

Analyze the terminal output to locate any version of Xwiki platform skin skinx in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 13.6), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.xwiki.platform command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-116: Improper Encoding or Escaping of Output, where the product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. as a result, the intended structure of the message is not preserved. In Xwiki platform skin skinx, 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

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. AbstractSxExportURLFactoryActionHandler#processSx does not escape anything from SSX document reference when serializing it on filesystem, so it's easy to mess up the HTML export process with reference elements containing filesystem syntax like "../", "./". or "/" in general (the last two not causing any security threat, but can cause conflicts with others serialized files). Patch can be found in 13.6-rc-1. Giving script or subwiki admin right only to trusted people and disabling HTML/PDF export can be done as workaround.

CVE-2022-23620 Affected Xwiki platform skin skinx Versions

1 component(s)
Fixed Versions:
13.6
Product / Package Ecosystem Affected Versions Fixed Version
org.xwiki.platform:xwiki-platform-skin-skinx
maven/org.xwiki.platform/xwiki-platform-skin-skinx
Maven
≥ 6.2-rc-1
< 13.6
13.6

References

GitHub Advisory / Wiki ADVISORY
https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-7ph6-5cmq-xgjq
NVD — CVE-2022-23620 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-23620
Security Fix Commit FIX COMMIT
https://github.com/xwiki/xwiki-platform/commit/ab778254fb8f71c774e1c1239368c44fe3b6bba5
Xwiki platform skin skinx Source Repository REPOSITORY
https://github.com/xwiki/xwiki-platform
jira.xwiki.org/browse/xwiki-18819 WEB
https://jira.xwiki.org/browse/XWIKI-18819

Frequently Asked Questions

What is CVE-2022-23620?
CVE-2022-23620 is a security vulnerability in Xwiki platform skin skinx involving Path traversal in xwiki-platform-skin-skinx under CWE-116: Improper Encoding or Escaping of Output.
Which Xwiki platform skin skinx versions are affected?
Affected versions include releases prior to 13.6 across affected packages: org.xwiki.platform:xwiki-platform-skin-skinx.
What version fixes CVE-2022-23620?
Upgrading to 13.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is xwiki-platform-skin-skinx affected?
Yes, org.xwiki.platform:xwiki-platform-skin-skinx is affected in releases prior to 13.6. Upgrade your dependency to 13.6 or later.
What is the CVSS score of CVE-2022-23620?
CVE-2022-23620 has a CVSS v3.1 base score of 6.8 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:H.
What CWE is associated with CVE-2022-23620?
CVE-2022-23620 is classified under CWE-116: Improper Encoding or Escaping of Output (The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.).
How can I check Maven dependencies for CVE-2022-23620?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.xwiki.platform'. 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-7ph6-5cmq-xgjq",
  "modified" : "2022-05-19T22:09:24Z",
  "published" : "2022-02-09T21:53:29Z",
  "aliases" : [ "CVE-2022-23620" ],
  "summary" : "Path traversal in xwiki-platform-skin-skinx",
  "details" : "XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. AbstractSxExportURLFactoryActionHandler#processSx does not escape anything from SSX document reference when serializing it on filesystem, so it's easy to mess up the HTML export process with reference elements containing filesystem syntax like \"../\", \"./\". or \"/\" in general (the last two not causing any security threat, but can cause conflicts with others serialized files). Patch can be found in 13.6-rc-1. Giving script or subwiki admin right only to trusted people and disabling HTML/PDF export can be done as workaround.\n\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.xwiki.platform:xwiki-platform-skin-skinx"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.2-rc-1"
      }, {
        "fixed" : "13.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-7ph6-5cmq-xgjq"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-23620"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/xwiki/xwiki-platform/commit/ab778254fb8f71c774e1c1239368c44fe3b6bba5"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/xwiki/xwiki-platform"
  }, {
    "type" : "WEB",
    "url" : "https://jira.xwiki.org/browse/XWIKI-18819"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-116", "CWE-22" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-02-09T21:53:29Z",
    "nvd_published_at" : "2022-02-09T22:15:00Z"
  }
}