Amazon Linux AMI update for tomcat9

1) Resource exhaustion

EUVDB-ID: #VU81728

Risk: High

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2023-44487

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: Yes

Description

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

The vulnerability exists due to improperly control of consumption for internal resources when handling HTTP/2 requests with compressed HEADERS frames. A remote attacker can send a sequence of compressed HEADERS frames followed by RST_STREAM frames and perform a denial of service (DoS) attack, a.k.a. "Rapid Reset".

Note, the vulnerability is being actively exploited in the wild.

Mitigation

Update the affected packages:

noarch:
    tomcat9-webapps-9.0.71-1.amzn2023.0.6.noarch
    tomcat9-lib-9.0.71-1.amzn2023.0.6.noarch
    tomcat9-admin-webapps-9.0.71-1.amzn2023.0.6.noarch
    tomcat9-servlet-4.0-api-9.0.71-1.amzn2023.0.6.noarch
    tomcat9-9.0.71-1.amzn2023.0.6.noarch
    tomcat9-jsp-2.3-api-9.0.71-1.amzn2023.0.6.noarch
    tomcat9-el-3.0-api-9.0.71-1.amzn2023.0.6.noarch
    tomcat9-docs-webapp-9.0.71-1.amzn2023.0.6.noarch

src:
    tomcat9-9.0.71-1.amzn2023.0.6.src

Vulnerable software versions

Amazon Linux AMI: All versions

tomcat9: before 9.0.71-1

CPE2.3

• cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*
• cpe:2.3:o:amazon_web_services:tomcat9:*:*:*:*:*:amazon_linux_ami:*:*

External links

https://alas.aws.amazon.com/AL2023/ALAS-2023-390.html

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?

Yes. This vulnerability is being exploited in the wild.