SB2021060805 - Multiple vulnerabilities in Microsoft SharePoint Server
Published: June 8, 2021 Updated: June 25, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 7 vulnerabilities.
1) Information disclosure (CVE-ID: CVE-2021-31965)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application within the Microsoft SharePoint Server. A remote authenticated attacker can gain unauthorized access to sensitive information on the system.
2) Code Injection (CVE-ID: CVE-2021-31963)
CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
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 SharePoint Server. A remote authenticated 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.
3) Code Injection (CVE-ID: CVE-2021-26420)
CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation within the System.Workflow.ComponentModel.Compiler.WorkflowCompilerInternal class in the Microsoft SharePoint Server. A remote authenticated 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.
4) Spoofing attack (CVE-ID: CVE-2021-31964)
CWE-ID: CWE-451 - User Interface (UI) Misrepresentation of Critical Information (Clickjacking, spoofing)
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to incorrect processing of user-supplied data in the Microsoft SharePoint Server. A remote authenticated attacker can spoof page content.
5) Spoofing attack (CVE-ID: CVE-2021-31950)
CWE-ID: CWE-451 - User Interface (UI) Misrepresentation of Critical Information (Clickjacking, spoofing)
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Green
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to incorrect processing of user-supplied data in the Microsoft SharePoint Server. A remote authenticated attacker can spoof page content.
6) Spoofing attack (CVE-ID: CVE-2021-31948)
CWE-ID: CWE-451 - User Interface (UI) Misrepresentation of Critical Information (Clickjacking, spoofing)
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to incorrect processing of user-supplied data in the Microsoft SharePoint Server. A remote authenticated attacker can spoof page content.
7) Code Injection (CVE-ID: CVE-2021-31966)
CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
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 SharePoint 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.
Remediation
Install update from vendor's website.
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31965
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31963
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26420
- https://www.zerodayinitiative.com/advisories/ZDI-21-755/
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31964
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31950
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31948
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31966