SB2021040723 - Amazon Linux AMI update for tomcat7
Published: April 7, 2021 Updated: September 27, 2024
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) Deserialization of Untrusted Data (CVE-ID: CVE-2020-9484)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data in uploaded files names. A remote attacker can pass specially crafted file name to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system but requires that the server is configured to use PersistenceManager with a FileStore and the attacker knows relative file path from storage location.
2) Resource exhaustion (CVE-ID: CVE-2020-9494)
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.
3) Deserialization of Untrusted Data (CVE-ID: CVE-2021-25329)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data. A remote attacker can pass specially crafted data to the application and execute arbitrary code on the target system.
Note, the vulnerability exists due to incomplete fix for #VU28158 and requires a certain specific configuration.
Remediation
Install update from vendor's website.