SB2020060918 - Multiple vulnerabilities in Microsoft SharePoint Server
Published: June 9, 2020 Updated: June 10, 2020
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 vulnerabilities.
1) Input validation error (CVE-ID: CVE-2020-1181)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/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 system.
The vulnerability exists due to the Microsoft SharePoint Server fails to properly identify and filter unsafe ASP.Net web controls. A remote authenticated attacker can create a specially crafted page and upload an XML file containing an arbitrary Web Part definition, which may result in remote code execution n the context of the service account.
2) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2020-1178)
CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N/E:U/U:Amber
The disclosed vulnerability allows a remote attacker to perform SSRF attacks.
The vulnerability exists due to the Microsoft SharePoint Server does not properly sanitize a specially crafted authentication request to an affected SharePoint server. A remote attacker can send a specially crafted message and trick the application to initiate requests to arbitrary systems, leading to remote code execution with elevated privileges.
3) Spoofing attack (CVE-ID: CVE-2020-1148)
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:N/VC:L/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 the Microsoft SharePoint Server does not properly sanitize a specially crafted web request to an affected SharePoint server. A remote authenticated attacker can send a specially crafted request and spoof page content.
4) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-1295)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/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 escalate privileges on the system.
The vulnerability exists due to the Microsoft SharePoint does not properly impose security restrictions. A remote authenticated attacker can send a specially crafted request to an affected server, thereby allowing the impersonation of another SharePoint user.
5) Spoofing attack (CVE-ID: CVE-2020-1289)
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:N/VC:L/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 the Microsoft SharePoint Server does not properly sanitize a specially crafted web request to an affected SharePoint server. A remote authenticated attacker can send a specially crafted request and spoof page content.
Remediation
Install update from vendor's website.
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1181
- https://www.zerodayinitiative.com/advisories/ZDI-20-694/
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1178
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1148
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1295
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1289