SB2024010241 - Multiple vulnerabilities in Red Hat Single Sign-On 7.6 on RHEL 9
Published: January 2, 2024
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) Cross-site scripting (CVE-ID: CVE-2023-6134)
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data within wildcard in OIDC redirect_uri. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
2) Open redirect (CVE-ID: CVE-2023-6291)
The vulnerability allows a remote attacker to redirect victims to arbitrary URL.
The vulnerability exists due to improper sanitization of user-supplied data in the verifyRedirectUri method. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.
Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.
3) Resource exhaustion (CVE-ID: CVE-2023-6563)
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper control over internal resources in environments which have millions of offline tokens (> 500,000 users with each having at least 2 saved sessions). A remote user can create two or more user sessions and then open the "consents" tab of the admin User Interface, the UI attempts to load a huge number of offline client sessions leading to excessive memory and CPU consumption which could potentially crash the entire system.
Remediation
Install update from vendor's website.