#VU29723 Infinite loop


Published: 2020-11-03 | Updated: 2022-06-02

Vulnerability identifier: #VU29723

Vulnerability risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-13935

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Apache Tomcat
Server applications / Web servers

Vendor: Apache Foundation

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Apache Tomcat: 10.0.0-M1 - 10.0.0.0-M1, 9.0.0 - 9.0.36, 8.5.0 - 8.5.56, 7.0.27 - 7.0.104


CPE

External links
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


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?


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