CVE-2020-16875
published 2020-09-11CVE-2020-16875: A remote code execution vulnerability exists in Microsoft Exchange server due to improper validation of cmdlet arguments. An attacker who successfully…
PriorityP181high7.2CVSS 3.1
AVNACLPRHUINSUCHIHAH
ITWEXPLOITVulnCheck KEVRansomware
Exploited in the wild
EPSS
46.50%
98.8th percentile
A remote code execution vulnerability exists in Microsoft Exchange server due to improper validation of cmdlet arguments.
An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the System user. Exploitation of the vulnerability requires an authenticated user in a certain Exchange role to be compromised.
The security update addresses the vulnerability by correcting how Microsoft Exchange handles cmdlet arguments.
Affected
30 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | microsoft_exchange_server_2016_cumulative_update_16 | >= 15.01.0 < publication | publication |
| microsoft | microsoft_exchange_server_2016_cumulative_update_17 | >= 15.01.0 < publication | publication |
| microsoft | microsoft_exchange_server_2019_cumulative_update_5 | >= 15.02.0 < publication | publication |
| microsoft | microsoft_exchange_server_2019_cumulative_update_6 | >= 15.02.0 < publication | publication |
| msrc | microsoft_exchange_server_2010_service_pack_3 | — | — |
| msrc | microsoft_exchange_server_2013_cumulative_update_21 | — | — |
| msrc | microsoft_exchange_server_2013_cumulative_update_22 | — | — |
| msrc | microsoft_exchange_server_2013_cumulative_update_23 | — | — |
| msrc | microsoft_exchange_server_2013_service_pack_1 | — | — |
| msrc | microsoft_exchange_server_2016_cumulative_update_10 | — | — |
| msrc | microsoft_exchange_server_2016_cumulative_update_11 | — | — |
| msrc | microsoft_exchange_server_2016_cumulative_update_12 | — | — |
| msrc | microsoft_exchange_server_2016_cumulative_update_13 | — | — |
| msrc | microsoft_exchange_server_2016_cumulative_update_14 | — | — |
| msrc | microsoft_exchange_server_2016_cumulative_update_15 | — | — |
| msrc | microsoft_exchange_server_2016_cumulative_update_16 | — | — |
| msrc | microsoft_exchange_server_2016_cumulative_update_17 | — | — |
| msrc | microsoft_exchange_server_2016_cumulative_update_18 | — | — |
| msrc | microsoft_exchange_server_2016_cumulative_update_19 | — | — |
| msrc | microsoft_exchange_server_2016_cumulative_update_8 | — | — |
| msrc | microsoft_exchange_server_2016_cumulative_update_9 | — | — |
| msrc | microsoft_exchange_server_2019 | — | — |
| msrc | microsoft_exchange_server_2019_cumulative_update_1 | — | — |
Detection & IOCsextracted from sources · hover to see the quote
- →Exploitation requires an authenticated user with the 'Data Loss Prevention' role — monitor for Exchange ECP requests involving DLP policy creation (New-DlpPolicy) from unexpected or low-privilege accounts. ↗
- →Exploitation results in code execution as SYSTEM on the Exchange server — alert on SYSTEM-level process spawning from Exchange worker processes (e.g., w3wp.exe spawning cmd.exe or powershell.exe). ↗
- →Exploitation vector is HTTP against the Exchange ECP (Exchange Control Panel) endpoint — monitor for anomalous POST requests to ECP DLP policy management paths from authenticated users. ↗
- ·Exploitation requires the target account to have the 'Data Loss Prevention' role and an active mailbox — not all authenticated Exchange users are exploitable. ↗
- ·Affected versions confirmed as Exchange Server 2016 and 2019; Metasploit module was tested against Exchange Server 2016 CU19 on Windows Server 2016. ↗
CVSS provenance
nvdv3.17.2HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
nvdv2.09.0CRITICALAV:N/AC:L/Au:S/C:C/I:C/A:C
vulncheck8.4HIGH
vendor_msrc9.1CRITICAL
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GHSA
GHSA-5rg4-jqjp-6664: A remote code execution vulnerability exists in Microsoft Exchange server due to improper validation of cmdlet arguments
ghsa_unreviewed·2022-05-24
CVE-2020-16875 [HIGH] CWE-269 GHSA-5rg4-jqjp-6664: A remote code execution vulnerability exists in Microsoft Exchange server due to improper validation of cmdlet arguments
A remote code execution vulnerability exists in Microsoft Exchange server due to improper validation of cmdlet arguments.An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the System user, aka 'Microsoft Exchange Server Remote Code Execution Vulnerability'.
VulnCheck
Microsoft Exchange Server Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
vulncheck·2020·CVSS 8.4
CVE-2020-16875 [HIGH] Microsoft Exchange Server Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Microsoft Exchange Server Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
A remote code execution vulnerability exists in Microsoft Exchange server due to improper validation of cmdlet arguments.
An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the System user. Exploitation of the vulnerability requires an authenticated user in a certain Exchange role to be compromised.
The security update addresses the vulnerability by correcting how Microsoft Exchange handles cmdlet arguments.
Affected: Microsoft Exchange Server
Required Action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Known Ransomware C
Project0
Project Zero RCA: CVE-2021-26855: Microsoft Exchange Server-Side Request Forgery
project_zero·CVSS 9.1
CVE-2021-26855 [CRITICAL] Project Zero RCA: CVE-2021-26855: Microsoft Exchange Server-Side Request Forgery
# CVE-2021-26855: Microsoft Exchange Server-Side Request Forgery
*Anthony Weems, Michael Weber, Dallas Kaman*
## The Basics
**Disclosure or Patch Date:** March 2 2021
**Product:** Microsoft Microsoft Exchange Server
**Advisory:** https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26855
**Affected Versions:** [Exchange 2010, 2013, 2016, and 2019](https://techcommunity.microsoft.com/t5/exchange-team-blog/march-2021-exchange-server-security-updates-for-older-cumulative/ba-p/2192020) before KB5000871.
**First Patched Version:** [KB5000871](https://support.microsoft.com/en-us/topic/description-of-the-security-update-for-microsoft-exchange-server-2019-2016-and-2013-march-2-2021-kb5000871-9800a6bb-0a21-4ee7-b9da-fa85b3e1d23b)
**Issue/Bug Report:** N/A
**Patch CL:** N/A
**Bug-
Microsoft
Microsoft Exchange Server Remote Code Execution Vulnerability
vendor_msrc·2021-03-09·CVSS 7.8
CVE-2021-26857 [CRITICAL] Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server Remote Code Execution Vulnerability
FAQ: Is this vulnerability being used in an active attack?
Yes. The vulnerability described in this CVE is one of four vulnerabilities that are being exploited in an active attack. The security updates address this attack. More information can be found here: https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server.
What is the target for this attack?
The initial attack in this attack chain targets an Exchange On-prem server that is able to receive untrusted connections from an external source. In addition, the Exchange server would need to be running Microsoft Exchange Server 2013, 2016, or 2019.
Where can I get more information about how to protect myself from the vulnerabilities?
Pleas
Microsoft
Microsoft Exchange Server Remote Code Execution Vulnerability
vendor_msrc·2021-03-09·CVSS 9.1
CVE-2021-26855 [CRITICAL] Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server Remote Code Execution Vulnerability
FAQ: Is this vulnerability being used in an active attack?
Yes. The vulnerability described in this CVE is one of four vulnerabilities that are being exploited in an active attack. The security updates address this attack. More information can be found here: https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server.
What is the target for this attack?
The initial attack in this attack chain targets an Exchange On-prem server that is able to receive untrusted connections from an external source. In addition, the Exchange server would need to be running Microsoft Exchange Server 2013, 2016, or 2019.
Where can I get more information about how to protect myself from the vulnerabilities?
Pleas
Microsoft
Microsoft Exchange Server Remote Code Execution Vulnerability
vendor_msrc·2021-03-09·CVSS 7.8
CVE-2021-27065 [CRITICAL] Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server Remote Code Execution Vulnerability
FAQ: Is this vulnerability being used in an active attack?
Yes. The vulnerability described in this CVE is one of four vulnerabilities that are being exploited in an active attack. The security updates address this attack. More information can be found here: https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server.
What is the target for this attack?
The initial attack in this attack chain targets an Exchange On-prem server that is able to receive untrusted connections from an external source. In addition, the Exchange server would need to be running Microsoft Exchange Server 2013, 2016, or 2019.
Where can I get more information about how to protect myself from the vulnerabilities?
Pleas
Microsoft
Microsoft Exchange Server Remote Code Execution Vulnerability
vendor_msrc·2021-03-09·CVSS 7.8
CVE-2021-26858 [CRITICAL] Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server Remote Code Execution Vulnerability
FAQ: Is this vulnerability being used in an active attack?
Yes. The vulnerability described in this CVE is one of four vulnerabilities that are being exploited in an active attack. The security updates address this attack. More information can be found here: https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server.
What is the target for this attack?
The initial attack in this attack chain targets an Exchange On-prem server that is able to receive untrusted connections from an external source. In addition, the Exchange server would need to be running Microsoft Exchange Server 2013, 2016, or 2019.
Where can I get more information about how to protect myself from the vulnerabilities?
Pleas
Microsoft
Microsoft Exchange Server Remote Code Execution Vulnerability
vendor_msrc·2020-09-08·CVSS 8.4
CVE-2020-16875 [HIGH] Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server Remote Code Execution Vulnerability
Description: A remote code execution vulnerability exists in Microsoft Exchange server due to improper validation of cmdlet arguments.
An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the System user. Exploitation of the vulnerability requires an authenticated user in a certain Exchange role to be compromised.
The security update addresses the vulnerability by correcting how Microsoft Exchange handles cmdlet arguments.
Microsoft Exchange Server: Microsoft Exchange Server
Microsoft: Microsoft
Impact: Remote Code Execution
Exploit Status: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely;Older Software Release:Exploitation Less Likely;DOS:N/A
No detection rules found.
Tenable
Microsoft’s December 2020 Patch Tuesday Addresses 58 CVEs including CVE-2020-25705 (SAD DNS)
blogs_tenable·2020-12-08·CVSS 7.4
[HIGH] Microsoft’s December 2020 Patch Tuesday Addresses 58 CVEs including CVE-2020-25705 (SAD DNS)
## Cloud Exposure
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Tenable Cloud Vulnerability Management Request a demo
Tenable CIEM Request a demo
Secure your cloud
## Vulnerability Exposure
Tenable Vulnerability Management Try for free
Tenable Security Center Request a demo
Tenable Web App Scanning Try for free
Tenable Patch Management Request a demo
Tenable Enclave Security Request a demo
Tenable Attack Surface Management Request a demo
Tenable Nessus Try for free
## AI Exposure
Tenable AI Exposure Request a demo
## OT/IoT Exposure
Tenable OT Security Request a demo
## Identity Exposure
Tenable Identity Exposure Request a demo
## Business needs
Active Directory
AI Security Posture Management (AI-SPM)
AWS security
Azure security
Cloud Security Posture Man
Krebs
Patch Tuesday, November 2020 Edition
blogs_krebs·2020-11-11·CVSS 9.6
[CRITICAL] Patch Tuesday, November 2020 Edition
Adobe and Microsoft each issued a bevy of updates today to plug critical security holes in their software. Microsoft’s release includes fixes for 112 separate flaws, including one zero-day vulnerability that is already being exploited to attack Windows users. Microsoft also is taking flak for changing its security advisories and limiting the amount of information disclosed about each bug.
Some 17 of the 112 issues fixed in today’s patch batch involve “critical” problems in Windows, or those that can be exploited by malware or malcontents to seize complete, remote control over a vulnerable Windows computer without any help from users.
Most of the rest were assigned the rating “important,” which in Redmond parlance refers to a vulnerability whose exploitation could “compromise the confiden
Tenable
Microsoft’s November 2020 Patch Tuesday Addresses 112 CVEs including CVE-2020-17087
blogs_tenable·2020-11-10·CVSS 7.8
[HIGH] Microsoft’s November 2020 Patch Tuesday Addresses 112 CVEs including CVE-2020-17087
## Cloud Exposure
Tenable Cloud Security (CNAPP) Request a demo
Tenable Cloud Vulnerability Management Request a demo
Tenable CIEM Request a demo
Secure your cloud
## Vulnerability Exposure
Tenable Vulnerability Management Try for free
Tenable Security Center Request a demo
Tenable Web App Scanning Try for free
Tenable Patch Management Request a demo
Tenable Enclave Security Request a demo
Tenable Attack Surface Management Request a demo
Tenable Nessus Try for free
## AI Exposure
Tenable AI Exposure Request a demo
## OT/IoT Exposure
Tenable OT Security Request a demo
## Identity Exposure
Tenable Identity Exposure Request a demo
## Business needs
Active Directory
AI Security Posture Management (AI-SPM)
AWS security
Azure security
Cloud Security Posture Man
Krebs
Patch Tuesday, November 2020 Edition
blogs_krebs·2020-11-10·CVSS 9.6
[CRITICAL] Patch Tuesday, November 2020 Edition
Adobe and Microsoft each issued a bevy of updates today to plug critical security holes in their software. Microsoft’s release includes fixes for 112 separate flaws, including one zero-day vulnerability that is already being exploited to attack Windows users. Microsoft also is taking flak for changing its security advisories and limiting the amount of information disclosed about each bug.
Some 17 of the 112 issues fixed in today’s patch batch involve “critical” problems in Windows, or those that can be exploited by malware or malcontents to seize complete, remote control over a vulnerable Windows computer without any help from users.
Most of the rest were assigned the rating “important,” which in Redmond parlance refers to a vulnerability whose exploitation could “compromise the confiden
Krebs
Microsoft Patch Tuesday, Sept. 2020 Edition
blogs_krebs·2020-09-23·CVSS 9.8
[CRITICAL] Microsoft Patch Tuesday, Sept. 2020 Edition
Microsoft today released updates to remedy nearly 130 security vulnerabilities in its Windows operating system and supported software. None of the flaws are known to be currently under active exploitation, but 23 of them could be exploited by malware or malcontents to seize complete control of Windows computers with little or no help from users.
The majority of the most dangerous or “critical” bugs deal with issues in Microsoft’s various Windows operating systems and its web browsers, Internet Explorer and Edge. September marks the seventh month in a row Microsoft has shipped fixes for more than 100 flaws in its products, and the fourth month in a row that it fixed more than 120.
Among the chief concerns for enterprises this month is CVE-2020-16875, which involves a critical flaw in the
Trendmicro
September Patch Tuesday Updates Exchange, SharePoint
blogs_trendmicro·2020-09-09·CVSS 7.5
[HIGH] September Patch Tuesday Updates Exchange, SharePoint
## September Patch Tuesday Updates Exchange, SharePoint
This month’s update includes 129 updates for the Microsoft Office suite, with 15 specifically addressing SharePoint vulnerabilities.
By: Trend Micro 2020/09/09 Read time: ( words)
Save to Folio
This month’s update includes 129 updates for the Microsoft Office suite, with 15 specifically addressing SharePoint vulnerabilities. Of the total number, 23 have been rated Critical and 105 as Important. No zero days have been observed, but four vulnerabilities are under close scrutiny for their potential abuse. Specifically, CVE-2020-16875 can be exploited for remote code execution (RCE), CVE-2020-1596 for man-in-the-middle (MiTM) attacks, while CVE-2020-0836 and CVE-2020-1228 can be abused for domain name system (DNS) denial of service (D
Trendmicro
September Patch Tuesday Updates Exchange, SharePoint
blogs_trendmicro·2020-09-09·CVSS 7.5
[HIGH] September Patch Tuesday Updates Exchange, SharePoint
## September Patch Tuesday Updates Exchange, SharePoint
This month’s update includes 129 updates for the Microsoft Office suite, with 15 specifically addressing SharePoint vulnerabilities.
By: Trend Micro Sep 09, 2020 Read time: ( words)
Save to Folio
This month’s update includes 129 updates for the Microsoft Office suite, with 15 specifically addressing SharePoint vulnerabilities. Of the total number, 23 have been rated Critical and 105 as Important. No zero days have been observed, but four vulnerabilities are under close scrutiny for their potential abuse. Specifically, CVE-2020-16875 can be exploited for remote code execution (RCE), CVE-2020-1596 for man-in-the-middle (MiTM) attacks, while CVE-2020-0836 and CVE-2020-1228 can be abused for domain name system (DNS) denial of service
Trendmicro
September Patch Tuesday Updates Exchange, SharePoint
blogs_trendmicro·2020-09-09·CVSS 7.5
[HIGH] September Patch Tuesday Updates Exchange, SharePoint
# September Patch Tuesday Updates Exchange, SharePoint
This month’s update includes 129 updates for the Microsoft Office suite, with 15 specifically addressing SharePoint vulnerabilities.
By: Trend Micro
2020/09/09
Read time: ( words)
Save to Folio
This month’s update includes 129 updates for the Microsoft Office suite, with 15 specifically addressing SharePoint vulnerabilities. Of the total number, 23 have been rated Critical and 105 as Important. No zero days have been observed, but four vulnerabilities are under close scrutiny for their potential abuse. Specifically, CVE-2020-16875 can be exploited for remote code execution (RCE), CVE-2020-1596 for man-in-the-middle (MiTM) attacks, while CVE-2020-0836 and CVE-2020-1228 can be abused for domain name system (DNS) denial of service (D
Krebs
Microsoft Patch Tuesday, Sept. 2020 Edition
blogs_krebs·2020-09-08·CVSS 9.8
[CRITICAL] Microsoft Patch Tuesday, Sept. 2020 Edition
Microsoft today released updates to remedy nearly 130 security vulnerabilities in its Windows operating system and supported software. None of the flaws are known to be currently under active exploitation, but 23 of them could be exploited by malware or malcontents to seize complete control of Windows computers with little or no help from users.
The majority of the most dangerous or “critical” bugs deal with issues in Microsoft’s various Windows operating systems and its web browsers, Internet Explorer and Edge . September marks the seventh month in a row Microsoft has shipped fixes for more than 100 flaws in its products, and the fourth month in a row that it fixed more than 120.
Among the chief concerns for enterprises this month is CVE-2020-16875 , which involves a critical flaw in th
Qualys
September 2020 Patch Tuesday – 129 Vulnerabilities, 23 Critical, SharePoint, Exchange, Windows Codecs, Adobe Vulns
blogs_qualys·2020-09-08·CVSS 8.6
[HIGH] September 2020 Patch Tuesday – 129 Vulnerabilities, 23 Critical, SharePoint, Exchange, Windows Codecs, Adobe Vulns
This month’s Microsoft Patch Tuesday addresses 129 vulnerabilities with 23 of them labeled as Critical. The 23 Critical vulnerabilities cover SharePoint, Exchange, Dynamics 365, Windows Codecs, and several other workstation vulnerabilities. Adobe released patches today for Experience Manager, Framemaker, and InDesign.
## Workstation Patches
Continuing the trend, today’s Patch Tuesday fixes many vulnerabilities that would impact workstations. The Windows Codecs, GDI+, Browser, COM, and Text Service Module vulnerabilities should be prioritized for workstation-type devices, meaning any system that is used for email or to access the internet via a browser. This includes multi-user servers that are used as remote desktops for users.
## SharePoint RCEs
Microsoft patched seven vulnerabilities
Tenable
Microsoft’s September 2020 Patch Tuesday Addresses 129 CVEs
blogs_tenable·2020-09-08
Microsoft’s September 2020 Patch Tuesday Addresses 129 CVEs
## Cloud Exposure
Tenable Cloud Security (CNAPP) Request a demo
Tenable Cloud Vulnerability Management Request a demo
Tenable CIEM Request a demo
Secure your cloud
## Vulnerability Exposure
Tenable Vulnerability Management Try for free
Tenable Security Center Request a demo
Tenable Web App Scanning Try for free
Tenable Patch Management Request a demo
Tenable Enclave Security Request a demo
Tenable Attack Surface Management Request a demo
Tenable Nessus Try for free
## AI Exposure
Tenable AI Exposure Request a demo
## OT/IoT Exposure
Tenable OT Security Request a demo
## Identity Exposure
Tenable Identity Exposure Request a demo
## Business needs
Active Directory
AI Security Posture Management (AI-SPM)
AWS security
Azure security
Cloud Security Posture Man
Qualys
September 2020 Patch Tuesday – 129 Vulnerabilities, 23 Critical, SharePoint, Exchange, Windows Codecs, Adobe Vulns | Qualys
blogs_qualys·2020-09-08·CVSS 8.6
[HIGH] September 2020 Patch Tuesday – 129 Vulnerabilities, 23 Critical, SharePoint, Exchange, Windows Codecs, Adobe Vulns | Qualys
This month’s Microsoft Patch Tuesday addresses 129 vulnerabilities with 23 of them labeled as Critical. The 23 Critical vulnerabilities cover SharePoint, Exchange, Dynamics 365, Windows Codecs, and several other workstation vulnerabilities. Adobe released patches today for Experience Manager, Framemaker, and InDesign.
### Workstation Patches
Continuing the trend, today’s Patch Tuesday fixes many vulnerabilities that would impact workstations. The Windows Codecs, GDI+, Browser, COM, and Text Service Module vulnerabilities should be prioritized for workstation-type devices, meaning any system that is used for email or to access the internet via a browser. This includes multi-user servers that are used as remote desktops for users.
### SharePoint RCEs
Microsoft patched seven vulnerabiliti
http://packetstormsecurity.com/files/159210/Microsoft-Exchange-Server-DlpUtils-AddTenantDlpPolicy-Remote-Code-Execution.htmlhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16875http://packetstormsecurity.com/files/159210/Microsoft-Exchange-Server-DlpUtils-AddTenantDlpPolicy-Remote-Code-Execution.htmlhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16875
2020-09-11
Published
Exploited in the wild