SB2020101333 - Multiple vulnerabilities in Microsoft SharePoint
Published: October 13, 2020 Updated: April 29, 2024
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 8 vulnerabilities.
1) Cross-site scripting (CVE-ID: CVE-2020-16944)
CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data in the SharePoint server. A remote authenticated attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
2) Out-of-bounds read (CVE-ID: CVE-2020-16953)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition when handling objects in memory within Microsoft SharePoint Server. A local user can create a specially crafted application and gain access to memory contents of an elevated process.
3) Out-of-bounds read (CVE-ID: CVE-2020-16948)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition when handling objects in memory within Microsoft SharePoint Server. A local user can create a specially crafted application and gain access to memory contents of an elevated process.
4) Information disclosure (CVE-ID: CVE-2020-16942)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to the Microsoft SharePoint Server improperly discloses its folder structure when rendering specific web pages. A local administrator can access to the specific SharePoint page and gain unauthorized access to sensitive information on the system.
5) Information disclosure (CVE-ID: CVE-2020-16941)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to the Microsoft SharePoint Server improperly discloses its folder structure when rendering specific web pages. A local administrator can access to the specific SharePoint page and gain unauthorized access to sensitive information on the system.
6) Input validation error (CVE-ID: CVE-2020-16952)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to the Microsoft SharePoint fails to check the source markup of an application package. A remote attacker can upload a specially crafted SharePoint application package and execute arbitrary code on the system.
7) Input validation error (CVE-ID: CVE-2020-16951)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to the Microsoft SharePoint fails to check the source markup of an application package. A remote attacker can upload a specially crafted SharePoint application package and execute arbitrary code on the system.
8) Out-of-bounds read (CVE-ID: CVE-2020-16950)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition when handling objects in memory within Microsoft SharePoint Server. A local user can create a specially crafted application and gain access to memory contents of an elevated process.
Remediation
Install update from vendor's website.
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16944
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16953
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16948
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16942
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16941
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16952
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16951
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16950