SB2021032320 - Multiple vulnerabilities in Red Hat Single Sign-On 7.4

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Main Vulnerability Database SB2021032320

SB2021032320 - Multiple vulnerabilities in Red Hat Single Sign-On 7.4

Published: March 23, 2021

Security Bulletin ID SB2021032320
Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Cross-site scripting (CVE-ID: CVE-2020-7676)

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 when wrapping "<option>" elements in "<select>" ones changes parsing behavior. A remote authenticated 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) Authentication Bypass by Capture-replay (CVE-ID: CVE-2020-14302)

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to the way Keycloak hadles authentication via external identity providers. After successful authentication the user is redirected to a Keycloak endpoint that accepts multiple invocations with the use of the same "state" parameter. A remote attacker can perform a replay attack and bypass authentication process.


Remediation

Install update from vendor's website.

References