SB2021082533 - OpenShift Service Mesh 1.1 update for servicemesh and servicemesh-proxy
Published: August 25, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Improper Authorization (CVE-ID: CVE-2021-32777)
The vulnerability allows a remote attacker to bypass authorization process.
The vulnerability exists due to an error in ext-authz extension when sending request headers to the external authorization service in Envoy. The application sends only the last header instead of merging multiple value headers according to the HTTP specification. A remote attacker can bypass authorization process and gain unauthorized access to the application, if ext-authz extension is used.
2) Information disclosure (CVE-ID: CVE-2021-32779)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to incorrectly handling of URI "#fragment" element as part of the path element. A remote attacker can send a specially crafted request and gain unauthorized access to sensitive information on the system.
3) Use-after-free (CVE-ID: CVE-2021-32781)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error when processing HTTP requests and responses in Envoy. A remote attacker can send a specially crafted HTTP request or response to the application, trigger a use-after-free error and perform a denial of service attack.
Successful exploitation of the vulnerability requires presence of extension that can modify and increase the size of request or response bodies.
4) Improper Authorization (CVE-ID: CVE-2021-39155)
The vulnerability allows a remote attacker to bypass authorization check.
The vulnerability exists due to case insensitive host comparison. A remote attacker can send a specially crafted request to bypass authorization on the target system.
5) Improper Authorization (CVE-ID: CVE-2021-39156)
The vulnerability allows a remote attacker to bypass authorization checks.
The vulnerability exists due to insufficient authorization checks. A remote attacker can send a specially crafted HTTP request with #fragment in the path and bypass authorization on the target system.
Remediation
Install update from vendor's website.