#VU29724 Resource management error in Apache Tomcat - CVE-2020-13934

Vulnerability identifier: #VU29724

Vulnerability risk: Medium

CVSSv4.0: 7.7 [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]

CVE-ID: CVE-2020-13934

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

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 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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Apache Tomcat: 8.5.1 - 8.5.56, 9.0.0-M5 - 9.0.36, 10.0.0-M1 - 10.0.0.0-M1

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External links
https://seclists.org/oss-sec/2020/q3/25
https://tomcat.apache.org/security-10.html
https://tomcat.apache.org/security-9.html
https://tomcat.apache.org/security-8.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.