Sharepoint Remote code execution (RCE) vulnerability
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2019-0604 | RCE in Microsoft SharePoint via Application Package Markup Validation Flaw Microsoft SharePoint fails to check the source markup of an application package, an improper input validation flaw (CWE-20) that allows maliciously crafted markup to be processed by the server. An attacker triggers the flaw by getting an affected SharePoint server to handle a crafted application package, without any special privileges described in the disclosure. Successful exploitation lets the attacker run remote code in the context of the SharePoint application pool and the SharePoint server farm account, providing control of the web server and access to a highly privileged farm-level identity. Any organization running an affected on-premises Microsoft SharePoint deployment is exposed, with internet-facing SharePoint servers at greatest risk. Exploitation is confirmed in the wild: the flaw was added to CISA's Known Exploited Vulnerabilities catalog on 2021-11-03 with known ransomware use and EPSS puts the probability of exploitation at 99.9%, although no public proof-of-concept is catalogued. Do: Apply Microsoft's SharePoint security updates per vendor instructions immediately, prioritizing internet-exposed SharePoint servers as CISA's required action directs. Given known in-the-wild and ransomware use, hunt for signs of compromise such as unexpected .aspx or webshell files in SharePoint directories and anomalous use of the SharePoint farm account. Restrict or firewall internet exposure of SharePoint servers until patches are confirmed applied. | 9.8 | 100% | KEV ransomware |
| mass≈ hundreds of thousands of on-prem SharePoint server deployments worldwide, of which tens of thousands are directly internet-facing (estimate) |
Full article281 words · extracted from securityaffairs.com · click to collapse
Pierluigi Paganini
February 18, 2020
A security expert found a flaw in SharePoint that could be exploited to remotely execute arbitrary code by sending a specially crafted SharePoint application package.
Summary:
A few days ago I saw a post from Alienvault which says attackers are still exploiting SharePoint vulnerability to attack Middle East government organization. Having said that I found Income Tax Department India and MIT Sloan was also vulnerable to CVE-2019-0604 a remote code execution vulnerability which exists in Microsoft SharePoint. A malicious actor could exploit this vulnerability by simply sending a specially crafted SharePoint application package.
Technical analysis:
I found this vulnerability during my free time while I was browsing to ZoomEye to find such component. The application (incometaxindia.gov.in) was found to be vulnerable as it was using SharePoint as a technology to host its service. To verify this I’ve sent a crafted payload which enable the remote server (incometaxindia.gov.in) to perform a DNS lookup on my burp collaborator. You can do this manual by sending the crafted XML payload or via desharialize.
Aside, MIT Sloan School of Management was also found to be vulnerable with CVE-2019-0604.
Responsible Disclosure:
CERT-In (IncomeTaxIndia)
This was sent to CERT-In on Feb 12, 2020, got initial response by them on Feb 13, 2020. Post that the vulnerability was patch silently.
For MIT:
This was sent to MIT security team on Feb 13, 2020, got initial response by them on Feb 14, 2020. Post that the vulnerability was patch silently on Feb 15, 2020.
About the Author: Security Researcher Dhiraj Mishra (@mishradhiraj)
Original post at:
https://www.inputzero.io/2020/02/sharepoint-rce.html
| [adrotate banner=”9″] | [adrotate banner=”12″] |
(SecurityAffairs – hacking, CVE-2019-0604)
[adrotate banner=”5″]
[adrotate banner=”13″]
Text extracted automatically; images, tables and formatting may be missing. Original: https://securityaffairs.com/98043/hacking/sharepoint-rce.html