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GHSA-w354-2f3c-qvg9

MediumCVSS 6.4 / 10
Published Mar 1, 2023·Last modified Feb 16, 2024
Affected Components(0)

No affected components available

Description

A flaw was found in Keycloak. Under specific circumstances, HTML entities are not sanitized during user impersonation, resulting in a Cross-site scripting (XSS) vulnerability.

Details

This issue is the result of code found in the exception here: https://github.com/keycloak/keycloak/blob/48835576daa158443f69917ac309e1a7c951bc87/services/src/main/java/org/keycloak/authentication/AuthenticationProcessor.java#L1045

Steps to reproduce

When using the legacy admin console:

  1. Sign in as Admin user in first tab.
  2. In that tab create new user in keycloak admin section > intercept user creation request and modify it by including malicious js script there (in username field).
  3. Sign in as newly created user in second tab (same browser window but second tab).
  4. Navigate back to first tab where you are signed in as admin, navigate to admin console which lists all application users.
  5. Choose any user (except newly created malicious one) – modify anything for that user in his settings. E.g. navigate to credentials tab and set new credentials for him. Also set new password as temporary.
  6. After update for that user is made, use impersonate option on that modified user.
  7. You should see window with form which requires providing new credentials – fill it and submit request.
  8. Just after submiting request user will get notified that “You are already authenticated as different user ‘[user + payload]’ in this session. Please sign out first.” And malicious payload will be executed instantly.
Risk Scores
Base Score
6.4

The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs high-level or administrative privileges. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence
5.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2022-1438
    Alias
  • EUVD-2023-1124
    Alias

Browse More

Medium severity
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