SB2019021307 - Multiple vulnerabilities in Microsoft SharePoint and SharePoint Foundation
Published: February 13, 2019 Updated: May 11, 2019
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Code Injection (CVE-ID: CVE-2019-0604)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation when processing source code markup of an application package. A remote attacker with ability to upload a malicious package to the SharePoint server can execute it on the system in the context of the SharePoint application pool and the SharePoint server farm account.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system but requires privileges to upload application packages.
Note: this vulnerability is being actively exploited in the wild since April 23.
2) Code Injection (CVE-ID: CVE-2019-0594)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation when processing source code markup of an application package. A remote attacker with ability to upload a malicious package to the SharePoint server can execute it on the system in the context of the SharePoint application pool and the SharePoint server farm account.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
3) Open redirect (CVE-ID: CVE-2019-0670)
The vulnerability allows a remote attacker to redirect victims to arbitrary URL.
The vulnerability exists due to improper sanitization of user-supplied data. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.
Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.
4) Cross-site scripting (CVE-ID: CVE-2019-0668)
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.
Remediation
Install update from vendor's website.
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0604
- https://www.ncsc.gov.sa/wps/portal/ncsc/home/Alerts/!ut/p/z1/lVLRboJAEPwaH8kud-cBj2elYKkxYgpyLwYR67V...
- https://pastebin.com/bUFPhucz
- https://otx.alienvault.com/pulse/5cd3f89df12b501c477a6fba
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0594
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0670
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0668