SB2020071406 - Multiple vulnerabilities in Apache Tomcat

Description

This security bulletin contains information about 2 vulnerabilities.

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

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

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

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) Resource management error (CVE-ID: CVE-2020-13934)

CWE-ID: CWE-399 - Resource Management Errors

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

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

The vulnerability exists due to improper management of internal resources when processing h2 direct connections. A remote attacker can pass specially crafted HTTP/2 requests to the server and consume all available memory.

Remediation

Install update from vendor's website.

References

• http://seclists.org/oss-sec/2020/q3/24
• http://tomcat.apache.org/security-10.html
• http://tomcat.apache.org/security-9.html
• http://tomcat.apache.org/security-8.html
• http://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.105
• http://seclists.org/oss-sec/2020/q3/25