SB2019091038 - Multiple vulnerabilities in Microsoft SharePoint
Published: September 10, 2019 Updated: September 11, 2019
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 7 vulnerabilities.
1) Input validation error (CVE-ID: CVE-2019-1295)
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:U/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to insufficient validation of user-supplied input passed to the SharePoint API endpoint. A remote attacker can send specially crafted request to the affected API and execute arbitrary code on the system in context of the SharePoint server farm account.
2) Cross-site request forgery (CVE-ID: CVE-2019-1261)
CWE-ID: CWE-352 - Cross-Site Request Forgery (CSRF)
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to perform cross-site request forgery attacks.
The vulnerability exists due to insufficient validation of the HTTP request origin. A remote attacker can trick the victim to visit a specially crafted web page and perform arbitrary actions on behalf of the victim on the vulnerable website.
3) Cross-site request forgery (CVE-ID: CVE-2019-1259)
CWE-ID: CWE-352 - Cross-Site Request Forgery (CSRF)
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to perform cross-site request forgery attacks.
The vulnerability exists due to insufficient validation of the HTTP request origin. A remote attacker can trick the victim to visit a specially crafted web page and perform arbitrary actions on behalf of the victim on the vulnerable website.
4) Cross-site scripting (CVE-ID: CVE-2019-1262)
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:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/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. A remote 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.
5) Session Fixation (CVE-ID: CVE-2019-1260)
CWE-ID: CWE-384 - Session Fixation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to impersonate other users.
The vulnerability exists due to incorrect validation of user-supplied input. A remote attacker can send a specially crafted request to the SharePoint server and impersonate another user.
6) Input validation error (CVE-ID: CVE-2019-1257)
CWE-ID: CWE-20 - Improper input validation
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 compromise the affected system.
The vulnerability exists due to insufficient validation of user-supplied input. A remote authenticated attacker with ability to upload a specially crafted SharePoint application package can execute arbitrary code on the system with privileges of the SharePoint server farm account.
7) Deserialization of Untrusted Data (CVE-ID: CVE-2019-1296)
CWE-ID: CWE-502 - Deserialization of Untrusted Data
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:U/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to insufficient validation of user-supplied input passed to the SharePoint API endpoint. A remote attacker can send specially crafted request to the affected API and execute arbitrary code on the system in context of the SharePoint server farm account.
Remediation
Install update from vendor's website.
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1295
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1261
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1259
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1262
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1260
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1257
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1296