From april at onenet.net Thu Mar 4 07:37:22 2021 From: april at onenet.net (Goode, April) Date: Thu, 4 Mar 2021 13:37:22 +0000 Subject: [CoIT-Security] MS-ISAC CYBERSECURITY ADVISORY - Multiple Vulnerabilities in Microsoft Exchange Server Could Allow for Arbitrary Code Execution - PATCH: NOW - TLP: WHITE In-Reply-To: <2ce7748da4014cfe92786004a0fefdf4@osrhe.edu> References: <98197443a4f549799a7a9fd6f47d9f61@cisecurity.org> <2ce7748da4014cfe92786004a0fefdf4@osrhe.edu> Message-ID: Good morning, We are sharing this advisory from MS-ISAC. If you have any questions about it, please let us know. Thanks, April Goode, MBA, SPP Director of OneNet Strategic Planning and Communications Oklahoma State Regents for Higher Education 405.225.9251 april at onenet.net ________________________________ TLP: WHITE MS-ISAC CYBERSECURITY ADVISORY MS-ISAC ADVISORY NUMBER: 2021-030 DATE(S) ISSUED: 03/02/2021 SUBJECT: Multiple Vulnerabilities in Microsoft Exchange Server Could Allow for Arbitrary Code Execution OVERVIEW: Multiple vulnerabilities have been discovered in Microsoft Exchange Server (on premises version) , the most severe of which could allow for arbitrary code execution. Microsoft Exchange Server is a mail server used to run and manage an organization's email services. Successful exploitation of the most severe of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the mail server. Depending on the privileges associated with the application, an attacker could view, change, or delete data. If this application has been configured to have fewer user rights on the system, exploitation of the most severe of these vulnerabilities could have less impact than if it was configured with administrative rights. THREAT INTELLIGENCE: Microsoft has detected the threat actor HAFNIUM exploiting these vulnerabilities. HAFNIUM primarily targets entities in the United States across a number of industry sectors, including infectious disease researchers, law firms, higher education institutions, defense contractors, policy think tanks, and NGOs. For more information on this threat actor and the details of the observed attacks please visit the Microsoft URL in the reference section. SYSTEMS AFFECTED: * Microsoft Exchange Server 2010 RU31 for Service Pack 3 * Microsoft Exchange Server 2013 CU 23 * Microsoft Exchange Server 2016 CU 18, CU 19 * Microsoft Exchange Server 2019 CU 7, CU 8 RISK: Government: * Large and medium government entities: High * Small government entities: High Businesses: * Large and medium business entities: High * Small business entities: High Home users: Low TECHNICAL SUMMARY: Multiple vulnerabilities have been discovered in Microsoft Exchange Server, the most severe of which could allow for arbitrary code execution. These vulnerabilities can be exploited remotely if an attacker locates a vulnerable server. Details of the vulnerabilities are as follows: * A server-side request forgery (SSRF) vulnerability in Exchange which allows the attacker to send arbitrary HTTP requests and authenticate as the Exchange server. [CVE-2021-26855] * An insecure deserialization vulnerability in the Unified Messaging service. Insecure deserialization is where untrusted user-controllable data is deserialized by a program. Exploiting this vulnerability gives an the ability to run code as SYSTEM on the Exchange server. This requires administrator permission or another vulnerability to exploit. [CVE-2021-26857] * A post-authentication arbitrary file write vulnerability in Exchange. If an attacker could authenticate with the Exchange server then they could use this vulnerability to write a file to any path on the server. They could authenticate by exploiting the CVE-2021-26855 SSRF vulnerability or by compromising a legitimate admin's credentials. [CVE-2021-26858] * A post-authentication arbitrary file write vulnerability in Exchange. If an attacker could authenticate with the Exchange server then they could use this vulnerability to write a file to any path on the server. They could authenticate by exploiting the CVE-2021-26855 SSRF vulnerability or by compromising a legitimate admin's credentials. [CVE-2021-27065] Successful exploitation of the most severe of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the mail server. Depending on the privileges associated with the application, an attacker could view, change, or delete data. If this application has been configured to have fewer user rights on the system, exploitation of the most severe of these vulnerabilities could have less impact than if it was configured with administrative rights. RECOMMENDATIONS: We recommend the following actions be taken: * Apply the stable channel update provided by Microsoft to vulnerable systems immediately after appropriate testing. * Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack. * Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources. * Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources. * Apply the Principle of Least Privilege to all systems and services. REFERENCES: Microsoft: https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/ Microsoft Security Response Center: https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server/ CVE: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26855 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26857 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26858 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27065 TLP: WHITE Disclosure is not limited. Subject to standard copyright rules, TLP: WHITE information may be distributed without restriction. http://www.us-cert.gov/tlp/ This message and attachments may contain confidential information. If it appears that this message was sent to you by mistake, any retention, dissemination, distribution or copying of this message and attachments is strictly prohibited. Please notify the sender immediately and permanently delete the message and any attachments. . . . . . -------------- next part -------------- An HTML attachment was scrubbed... URL: From april at onenet.net Fri Mar 5 15:49:48 2021 From: april at onenet.net (Goode, April) Date: Fri, 5 Mar 2021 21:49:48 +0000 Subject: [CoIT-Security] MS-ISAC CYBERSECURITY ADVISORY - Multiple Vulnerabilities in Microsoft Exchange Server Could Allow for Arbitrary Code Execution - PATCH: NOW - TLP: WHITE In-Reply-To: <52fafe045ac0472fb007a62ae06c1d9e@osrhe.edu> References: <98197443a4f549799a7a9fd6f47d9f61@cisecurity.org> <2ce7748da4014cfe92786004a0fefdf4@osrhe.edu>, <52fafe045ac0472fb007a62ae06c1d9e@osrhe.edu> Message-ID: <9b28333118d844fa9cfeb7b179f0a26b@onenet.net> Good afternoon - Here is an update from Chris on this advisory. Update: Critical Updates for Microsoft Exchange Server We strongly encourage all on-premise exchange customers to patch immediately and follow Microsoft guidance for investigating previous exposure. https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/ https://us-cert.cisa.gov/ncas/alerts/aa21-062a CK ________________________________ From: Goode, April Sent: Thursday, March 4, 2021 7:37 AM To: Kosciuk, Chris; 'coit-security at lists.onenet.net' Cc: Royal, Von; Burkhart, Brian; Thigpen, Nick Subject: RE: MS-ISAC CYBERSECURITY ADVISORY - Multiple Vulnerabilities in Microsoft Exchange Server Could Allow for Arbitrary Code Execution - PATCH: NOW - TLP: WHITE Good morning, We are sharing this advisory from MS-ISAC. If you have any questions about it, please let us know. Thanks, April Goode, MBA, SPP Director of OneNet Strategic Planning and Communications Oklahoma State Regents for Higher Education 405.225.9251 april at onenet.net ________________________________ TLP: WHITE MS-ISAC CYBERSECURITY ADVISORY MS-ISAC ADVISORY NUMBER: 2021-030 DATE(S) ISSUED: 03/02/2021 SUBJECT: Multiple Vulnerabilities in Microsoft Exchange Server Could Allow for Arbitrary Code Execution OVERVIEW: Multiple vulnerabilities have been discovered in Microsoft Exchange Server (on premises version) , the most severe of which could allow for arbitrary code execution. Microsoft Exchange Server is a mail server used to run and manage an organization's email services. Successful exploitation of the most severe of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the mail server. Depending on the privileges associated with the application, an attacker could view, change, or delete data. If this application has been configured to have fewer user rights on the system, exploitation of the most severe of these vulnerabilities could have less impact than if it was configured with administrative rights. THREAT INTELLIGENCE: Microsoft has detected the threat actor HAFNIUM exploiting these vulnerabilities. HAFNIUM primarily targets entities in the United States across a number of industry sectors, including infectious disease researchers, law firms, higher education institutions, defense contractors, policy think tanks, and NGOs. For more information on this threat actor and the details of the observed attacks please visit the Microsoft URL in the reference section. SYSTEMS AFFECTED: * Microsoft Exchange Server 2010 RU31 for Service Pack 3 * Microsoft Exchange Server 2013 CU 23 * Microsoft Exchange Server 2016 CU 18, CU 19 * Microsoft Exchange Server 2019 CU 7, CU 8 RISK: Government: * Large and medium government entities: High * Small government entities: High Businesses: * Large and medium business entities: High * Small business entities: High Home users: Low TECHNICAL SUMMARY: Multiple vulnerabilities have been discovered in Microsoft Exchange Server, the most severe of which could allow for arbitrary code execution. These vulnerabilities can be exploited remotely if an attacker locates a vulnerable server. Details of the vulnerabilities are as follows: * A server-side request forgery (SSRF) vulnerability in Exchange which allows the attacker to send arbitrary HTTP requests and authenticate as the Exchange server. [CVE-2021-26855] * An insecure deserialization vulnerability in the Unified Messaging service. Insecure deserialization is where untrusted user-controllable data is deserialized by a program. Exploiting this vulnerability gives an the ability to run code as SYSTEM on the Exchange server. This requires administrator permission or another vulnerability to exploit. [CVE-2021-26857] * A post-authentication arbitrary file write vulnerability in Exchange. If an attacker could authenticate with the Exchange server then they could use this vulnerability to write a file to any path on the server. They could authenticate by exploiting the CVE-2021-26855 SSRF vulnerability or by compromising a legitimate admin's credentials. [CVE-2021-26858] * A post-authentication arbitrary file write vulnerability in Exchange. If an attacker could authenticate with the Exchange server then they could use this vulnerability to write a file to any path on the server. They could authenticate by exploiting the CVE-2021-26855 SSRF vulnerability or by compromising a legitimate admin's credentials. [CVE-2021-27065] Successful exploitation of the most severe of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the mail server. Depending on the privileges associated with the application, an attacker could view, change, or delete data. If this application has been configured to have fewer user rights on the system, exploitation of the most severe of these vulnerabilities could have less impact than if it was configured with administrative rights. RECOMMENDATIONS: We recommend the following actions be taken: * Apply the stable channel update provided by Microsoft to vulnerable systems immediately after appropriate testing. * Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack. * Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources. * Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources. * Apply the Principle of Least Privilege to all systems and services. REFERENCES: Microsoft: https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/ Microsoft Security Response Center: https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server/ CVE: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26855 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26857 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26858 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27065 TLP: WHITE Disclosure is not limited. Subject to standard copyright rules, TLP: WHITE information may be distributed without restriction. http://www.us-cert.gov/tlp/ This message and attachments may contain confidential information. If it appears that this message was sent to you by mistake, any retention, dissemination, distribution or copying of this message and attachments is strictly prohibited. Please notify the sender immediately and permanently delete the message and any attachments. . . . . . -------------- next part -------------- An HTML attachment was scrubbed... URL: From kmcclure at cameron.edu Fri Mar 5 15:56:53 2021 From: kmcclure at cameron.edu (Kelly McClure) Date: Fri, 5 Mar 2021 21:56:53 +0000 Subject: [CoIT-Security] MS-ISAC CYBERSECURITY ADVISORY - Multiple Vulnerabilities in Microsoft Exchange Server Could Allow for Arbitrary Code Execution - PATCH: NOW - TLP: WHITE In-Reply-To: <9b28333118d844fa9cfeb7b179f0a26b@onenet.net> References: <98197443a4f549799a7a9fd6f47d9f61@cisecurity.org> <2ce7748da4014cfe92786004a0fefdf4@osrhe.edu>, <52fafe045ac0472fb007a62ae06c1d9e@osrhe.edu> <9b28333118d844fa9cfeb7b179f0a26b@onenet.net> Message-ID: Thanks April, And Chris, My team was on it as soon as we found out. Kelly Kelly McClure Director of Information Technology Services Cameron University 2800 West Gore Boulevard Lawton, Oklahoma 73505 E-Mail: kmcclure at cameron.edu [cid:image001.png at 01D12C22.15C33580] From: CoIT-Security On Behalf Of Goode, April via CoIT-Security Sent: Friday, March 5, 2021 3:50 PM To: Kosciuk, Chris ; Royal, Von ; Burkhart, Brian ; 'coit-security at lists.onenet.net' Cc: Goode, April Subject: Re: [CoIT-Security] MS-ISAC CYBERSECURITY ADVISORY - Multiple Vulnerabilities in Microsoft Exchange Server Could Allow for Arbitrary Code Execution - PATCH: NOW - TLP: WHITE Good afternoon - Here is an update from Chris on this advisory. Update: Critical Updates for Microsoft Exchange Server We strongly encourage all on-premise exchange customers to patch immediately and follow Microsoft guidance for investigating previous exposure. https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/ https://us-cert.cisa.gov/ncas/alerts/aa21-062a CK ________________________________ From: Goode, April Sent: Thursday, March 4, 2021 7:37 AM To: Kosciuk, Chris; 'coit-security at lists.onenet.net' Cc: Royal, Von; Burkhart, Brian; Thigpen, Nick Subject: RE: MS-ISAC CYBERSECURITY ADVISORY - Multiple Vulnerabilities in Microsoft Exchange Server Could Allow for Arbitrary Code Execution - PATCH: NOW - TLP: WHITE Good morning, We are sharing this advisory from MS-ISAC. If you have any questions about it, please let us know. Thanks, April Goode, MBA, SPP Director of OneNet Strategic Planning and Communications Oklahoma State Regents for Higher Education 405.225.9251 april at onenet.net ________________________________ TLP: WHITE MS-ISAC CYBERSECURITY ADVISORY MS-ISAC ADVISORY NUMBER: 2021-030 DATE(S) ISSUED: 03/02/2021 SUBJECT: Multiple Vulnerabilities in Microsoft Exchange Server Could Allow for Arbitrary Code Execution OVERVIEW: Multiple vulnerabilities have been discovered in Microsoft Exchange Server (on premises version) , the most severe of which could allow for arbitrary code execution. Microsoft Exchange Server is a mail server used to run and manage an organization's email services. Successful exploitation of the most severe of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the mail server. Depending on the privileges associated with the application, an attacker could view, change, or delete data. If this application has been configured to have fewer user rights on the system, exploitation of the most severe of these vulnerabilities could have less impact than if it was configured with administrative rights. THREAT INTELLIGENCE: Microsoft has detected the threat actor HAFNIUM exploiting these vulnerabilities. HAFNIUM primarily targets entities in the United States across a number of industry sectors, including infectious disease researchers, law firms, higher education institutions, defense contractors, policy think tanks, and NGOs. For more information on this threat actor and the details of the observed attacks please visit the Microsoft URL in the reference section. SYSTEMS AFFECTED: * Microsoft Exchange Server 2010 RU31 for Service Pack 3 * Microsoft Exchange Server 2013 CU 23 * Microsoft Exchange Server 2016 CU 18, CU 19 * Microsoft Exchange Server 2019 CU 7, CU 8 RISK: Government: * Large and medium government entities: High * Small government entities: High Businesses: * Large and medium business entities: High * Small business entities: High Home users: Low TECHNICAL SUMMARY: Multiple vulnerabilities have been discovered in Microsoft Exchange Server, the most severe of which could allow for arbitrary code execution. These vulnerabilities can be exploited remotely if an attacker locates a vulnerable server. Details of the vulnerabilities are as follows: * A server-side request forgery (SSRF) vulnerability in Exchange which allows the attacker to send arbitrary HTTP requests and authenticate as the Exchange server. [CVE-2021-26855] * An insecure deserialization vulnerability in the Unified Messaging service. Insecure deserialization is where untrusted user-controllable data is deserialized by a program. Exploiting this vulnerability gives an the ability to run code as SYSTEM on the Exchange server. This requires administrator permission or another vulnerability to exploit. [CVE-2021-26857] * A post-authentication arbitrary file write vulnerability in Exchange. If an attacker could authenticate with the Exchange server then they could use this vulnerability to write a file to any path on the server. They could authenticate by exploiting the CVE-2021-26855 SSRF vulnerability or by compromising a legitimate admin's credentials. [CVE-2021-26858] * A post-authentication arbitrary file write vulnerability in Exchange. If an attacker could authenticate with the Exchange server then they could use this vulnerability to write a file to any path on the server. They could authenticate by exploiting the CVE-2021-26855 SSRF vulnerability or by compromising a legitimate admin's credentials. [CVE-2021-27065] Successful exploitation of the most severe of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the mail server. Depending on the privileges associated with the application, an attacker could view, change, or delete data. If this application has been configured to have fewer user rights on the system, exploitation of the most severe of these vulnerabilities could have less impact than if it was configured with administrative rights. RECOMMENDATIONS: We recommend the following actions be taken: * Apply the stable channel update provided by Microsoft to vulnerable systems immediately after appropriate testing. * Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack. * Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources. * Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources. * Apply the Principle of Least Privilege to all systems and services. REFERENCES: Microsoft: https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/ Microsoft Security Response Center: https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server/ CVE: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26855 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26857 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26858 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27065 TLP: WHITE Disclosure is not limited. Subject to standard copyright rules, TLP: WHITE information may be distributed without restriction. http://www.us-cert.gov/tlp/ This message and attachments may contain confidential information. If it appears that this message was sent to you by mistake, any retention, dissemination, distribution or copying of this message and attachments is strictly prohibited. Please notify the sender immediately and permanently delete the message and any attachments. . . . . . -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: image001.jpg Type: image/jpeg Size: 1701 bytes Desc: image001.jpg URL: