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It's possible to save pretty much anything anywhere by creating and using an SSX/JSX containing "../" in its reference

High
tmortagne published GHSA-7ph6-5cmq-xgjq Feb 9, 2022

Package

maven org.xwiki.platform:xwiki-platform-skin-skinx (Maven)

Affected versions

>= 6.2-rc-1, < 13.6

Patched versions

13.6

Description

Impact

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).

Patches

Fixed in 13.6-rc-1

Workarounds

  • giving script or subwiki admin right only to trusted people
  • disabling HTML/PDF export

References

https://jira.xwiki.org/browse/XWIKI-18819

For more information

If you have any questions or comments about this advisory:

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:H

CVE ID

CVE-2022-23620

Weaknesses