SB2020080420 - Ubuntu update for tomcat8

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Infinite loop (CVE-ID: CVE-2020-13935)

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

The vulnerability exists due to infinite loop when processing payload length in a WebSocket frame. A remote attacker can send a specially crafted request to the application, consume all available system resources and cause denial of service conditions.

2) Inconsistent interpretation of HTTP requests (CVE-ID: CVE-2020-1935)

The vulnerability allows a remote attacker to perform HTTP request smuggling attack.

The vulnerability exists due to the HTTP header parsing code uses an approach to end-of-line parsing that allows some invalid HTTP headers to be parsed as valid. A remote attacker can send a specially crafted HTTP request and perform HTTP request smuggling attack.

3) Deserialization of Untrusted Data (CVE-ID: CVE-2020-9484)

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

The vulnerability exists due to insecure input validation when processing serialized data in uploaded files names. A remote attacker can pass specially crafted file name to the application and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system but requires that the server is configured to use PersistenceManager with a FileStore and the attacker knows relative file path from storage location.

Remediation

Install update from vendor's website.

References

• https://ubuntu.com/security/notices/USN-4448-1