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Stored XSS from ##FULLFORM##

Moderate
btry published GHSA-777g-3848-8r3g May 31, 2023

Package

No package listed

Affected versions

2.13.5

Patched versions

None

Description

Hi team

Summary

A probable Stored XSS is présent in formcreator via the use of the use of ##FULLFORM## for render.

PoC

1 - As admin : create a form with a question classic text field.
2 - As admin : as target description templating description use "##FULLFORM##"
3 - As user : fill the form with the paylod : "><img src=x onerror="alert(1337)" x=x>
4 - As admin : Go to the newly created ticket : https://mysuperglpi.fr/front/ticket.form.php?id=704

Impact

Arbitrary javascript code execution in admin/tech context.

Temporary workaround

Use regex for remove < > " on all field ...

Sorry for my english,

Severity

Moderate

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
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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:N/UI:R/S:U/C:H/I:N/A:N

CVE ID

CVE-2023-33971

Weaknesses