SB2020111703 - Multiple vulnerabilities in Typo3
Published: November 17, 2020
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) Cross-site scripting (CVE-ID: CVE-2020-26227)
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 the system extension Fluid (typo3/cms-fluid) when processing input passed via the Fluid view helpers. 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) Cleartext storage of sensitive information (CVE-ID: CVE-2020-26228)
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to Typo3 stores user session identifiers in clear text. The vulnerability can be exploited in combination of other issues to retrieve session identifiers and gain unauthorized access to the application.
3) XML External Entity injection (CVE-ID: CVE-2020-26229)
The vulnerability allows a remote user to gain access to sensitive information.
The vulnerability exists due to insufficient validation of user-supplied XML input within RSS widgets. A remote user can pass a specially crafted XML code to the affected application and view contents of arbitrary files on the system or initiate requests to external systems.
Successful exploitation of the vulnerability may allow an attacker to view contents of arbitrary file on the server or perform network scanning of internal and external infrastructure.
Remediation
Install update from vendor's website.