Resource exhaustion in Apache Traffic Server - CVE-2020-9494

Vulnerability identifier: #VU29356

CSH Severity: Medium

CVSS v4: 8.7 [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]

CVE-ID: CVE-2020-9494

CWE-ID: CWE-400

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to application does not properly control consumption of internal resources when processing HTTP/2 HEADERS frames. A remote attacker can send specially crafted HTTP/2 requests to the server, trigger resource exhaustion and perform a denial of service (DoS) attack.

Apache Traffic Server
Amazon Linux AMI
Debian Linux
Ubuntu
openEuler
trafficserver (Debian package)
tomcat
tomcat-help
tomcat-jsvc
libtomcat9-embed-java (Ubuntu package)
tomcat9-common (Ubuntu package)
libtomcat9-java (Ubuntu package)
tomcat9 (Ubuntu package)

Install updates from vendor's website.

Apache Traffic Server - addressed in versions 7.1.11, 8.0.8
trafficserver (Debian package) - update to 8.0.2+ds-1+deb10u3
tomcat - update to 9.0.10-18
tomcat-help - update to 9.0.10-18
tomcat-jsvc - update to 9.0.10-18
libtomcat9-embed-java (Ubuntu package) - addressed in versions 9.0.16-3ubuntu0.18.04.2, 9.0.31-1ubuntu0.2
tomcat9-common (Ubuntu package) - addressed in versions 9.0.16-3ubuntu0.18.04.2, 9.0.31-1ubuntu0.2
libtomcat9-java (Ubuntu package) - addressed in versions 9.0.16-3ubuntu0.18.04.2, 9.0.31-1ubuntu0.2
tomcat9 (Ubuntu package) - addressed in versions 9.0.16-3ubuntu0.18.04.2, 9.0.31-1ubuntu0.2

• https://lists.apache.org/thread.html/rf7f86917f42fdaf904d99560cba0c016e03baea6244c47efeb60ecbe%40%3Cdev.trafficserver.apache.org%3E
• https://www.debian.org/security/2020/dsa-4710

• Denial of service in Apache Traffic Server
• Amazon Linux AMI update for tomcat7
• Ubuntu update for tomcat9
• Debian update for trafficserver
• openEuler 20.03 LTS SP1 update for tomcat