CVE-2024-1722
Description
A flaw was found in Keycloak. In certain conditions, this issue may allow a remote unauthenticated attacker to block other accounts from logging in.
Statement
While this attack enables locking out an individual from their account, the entire system will remain in operation. The follow conditions are required for successful exploitation:
- The realm is configured to use "User (Self) registration"
- The user registers with a username in email format
- The attacker discovers a valid email address for an account
Due to these conditions, the security impact has been rated Low.
Mitigation
Red Hat Product Security is not aware of a way to completely mitigate this issue. However, the following techniques can be used to help prevent exploitation:
- Put limits on frequency of account registration, restricting how often an attacker could utilize this attack
- Restrict new account registration to not allow email addresses in the username field, for example, by not allowing the "@" symbol. Note: this cannot prevent attacks against existing users who have registered with an email address.
If this vulnerability has been triggered, an administrator has two options to remedy it manually by modifying the second account (of the attacker):
- Delete the account
- Change the username
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 3.7 | N/A | 3.7 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | High |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | Low | N/A | Low |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (Other)
Users could be locked out of accounts.
Acknowledgements
Red Hat would like to thank Maor Abutbul (CyberArk) for reporting this issue.
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