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osvGoogleOSV:GHSA-5MF8-V43W-MFXP
HistoryAug 21, 2023 - 8:10 p.m.

XWiki Platform privilege escalation (PR) from account through AWM content fields

2023-08-2120:10:55
Google
osv.dev
10
xwiki 14.10.5
xwiki 15.1rc1
appwithinminutes.application
content field
scripting rights
fix
jira issue
github commit
security mailing list

9.9 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

LOW

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

0.001 Low

EPSS

Percentile

39.6%

Impact

Any registered user can use the content field of their user profile page to execute arbitrary scripts with programming rights, thus effectively performing rights escalation.

The problem is present since version 4.3M2 when AppWithinMinutes Application added support for the Content field, allowing any wiki page (including the user profile page) to use its content as an AWM Content field, which has a custom displayer that executes the content with the rights of the AppWithinMinutes.Content author, rather than the rights of the content author.

Patches

The issue has been fixed in XWiki 14.10.5 and 15.1RC1 by https://github.com/xwiki/xwiki-platform/commit/dfb1cde173e363ca5c12eb3654869f9719820262 . The fix is in the content of the AppWithinMinutes.Content page that defines the custom displayer. By using the display script service to render the content we make sure that the proper author is used for access rights checks.

Workarounds

If you want to fix this problem on older versions of XWiki that have not been patched then you need to modify the content of AppWithinMinutes.Content page to use the display script service to render the content, like this:

- {{html}}$tdoc.getRenderedContent($tdoc.content, $tdoc.syntax.toIdString()).replace('{{', '{{'){{/html}}
+ {{html}}$services.display.content($tdoc, {
+   'displayerHint': 'default'
+ }).replace('{{/html}}', '{{/html}}'){{/html}}

References

For more information

If you have any questions or comments about this advisory:

Attribution

This vulnerability has been found and reported by @michitux .

9.9 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

LOW

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

0.001 Low

EPSS

Percentile

39.6%

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