SB2021071319 - Multiple vulnerabilities in Microsoft Exchange Server
Published: July 13, 2021 Updated: January 2, 2024
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 secuirty vulnerabilities.
1) Code Injection (CVE-ID: CVE-2021-31196)
The vulnerability allows a remote user to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation in the Microsoft Exchange Server. A remote administrator can send a specially crafted request and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-34470)
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to application does not properly impose security restrictions in the Microsoft Exchange Server. A remote authenticated attacker on the local network can gain elevated privileges on the target system.
3) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-33768)
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to application does not properly impose security restrictions in the Microsoft Exchange Server. A remote authenticated attacker on the local network can gain elevated privileges on the target system.
4) Code Injection (CVE-ID: CVE-2021-34473)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation in the Microsoft Exchange Server. A remote attacker can send a specially crafted request and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
5) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-34523)
The vulnerability allows a remote local to escalate privileges on the system.
The vulnerability exists due to application does not properly impose security restrictions in the Microsoft Exchange Server, which leads to security restrictions bypass and privilege escalation.
6) Code Injection (CVE-ID: CVE-2021-31206)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation in the Microsoft Exchange Server. A remote attacker can send a specially crafted request and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Remediation
Install update from vendor's website.
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31196
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34470
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33768
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34523
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31206