SB2018072404 - Multiple vulnerabilities in Apache Tomcat

Description

This security bulletin contains information about 2 vulnerabilities.

1) Security restrictions bypass (CVE-ID: CVE-2018-8034)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The vulnerability exists due to host name verification when using TLS with the WebSocket client was missing. A remote unauthenticated attacker can bypass security restrictions when using TLS.

2) Information disclosure (CVE-ID: CVE-2018-8037)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to obtain potentially sensitive information on the target system.

The vulnerability exists due to improper handling of connection closures by the non-blocking I/O (NIO) and NIO2 connectors. A remote unauthenticated attacker can send a specially crafted request that submits malicious input, trigger bug in the tracking of connection closures, reuse user sessions in a new connection and access arbitrary data.

Remediation

Install update from vendor's website.

References

• https://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.90
• https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.10