SB2019052003 - Amazon Linux AMI update for tomcat8

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Open redirect (CVE-ID: CVE-2018-11784)

The vulnerability allows a remote attacker to redirect victims to arbitrary URI.

The vulnerability exists due to improper sanitization of user-supplied data. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary URI.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

2) Resource exhaustion (CVE-ID: CVE-2019-0199)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists within the HTTP/2 implementation in Apache Tomcat that accepts streams with excessive numbers of SETTINGS frames and also permits clients to keep streams open without reading/writing request/response data. A remote attacker can exhaust all available threads on the server and perform denial of service attack.

3) OS Command Injection (CVE-ID: CVE-2019-0232)

The vulnerability allows a remote attacker to execute arbitrary commands on the target system.

The vulnerability exists due to an input validation error within the CGI Servlet when passing arguments from JRE to the Windows environment. A remote attacker can send a specially crafted request to the CGI Servlet, inject and execute arbitrary OS commands on the system with Apache Tomcat privileges.

Successful exploitation of the vulnerability requires that Apache Tomcat is installed on Windows operating system with enabled option “enableCmdLineArguments” (CGI Servlet and “enableCmdLineArguments” option are disabled by default).

Remediation

Install update from vendor's website.

References

• https://alas.aws.amazon.com/ALAS-2019-1208.html