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gotify/server vulnerable to Cross-site Scripting in the application image file upload

Moderate severity GitHub Reviewed Published Dec 29, 2022 in gotify/server • Updated Jan 29, 2023

Package

gomod github.com/gotify/server (Go)

Affected versions

<= 2.2.1

Patched versions

2.2.2

Description

Impact

The XSS vulnerability allows authenticated users to upload .html files. With that, an attacker could execute client side scripts if another user opened a link, such as:

https://push.example.org/image/[alphanumeric string].html

An attacker could potentially take over the account of the user that clicked the link. Keep in mind, the Gotify UI won't natively expose such a malicious link, so an attacker has to get the user to open the malicious link in a context outside of Gotify.

Patches

The vulnerability has been fixed in version 2.2.2.

Workarounds

You can block access to non image files via a reverse proxy in the ./image directory.

References

gotify/server#534
gotify/server#535

Thanks to rickshang (aka 无在无不在) for discovering and reporting this bug.

References

@jmattheis jmattheis published to gotify/server Dec 29, 2022
Published by the National Vulnerability Database Dec 29, 2022
Published to the GitHub Advisory Database Dec 30, 2022
Reviewed Dec 30, 2022
Last updated Jan 29, 2023

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
Low
User interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
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:L/UI:R/S:U/C:L/I:L/A:N

EPSS score

0.060%
(27th percentile)

Weaknesses

CVE ID

CVE-2022-46181

GHSA ID

GHSA-xv6x-456v-24xh

Source code

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