Joint Advisory AA22-279A and Vulristics

Hello everyone! This episode will be about the new hot twenty vulnerabilities from CISA, NSA and FBI, Joint cybersecurity advisory CSA AA22-279A, and how I analyzed these vulnerabilities using my open source project Vulristics. Alternative video link for Russia: Americans cant just release a list...

2021 Top Routinely Exploited Vulnerabilities

Summary This joint Cybersecurity Advisory CSA was coauthored by cybersecurity authorities of the United States, Australia, Canada, New Zealand, and the United Kingdom: the Cybersecurity and Infrastructure Security Agency CISA, National Security Agency NSA, Federal Bureau of Investigation FBI,...

Lemon Duck Cryptojacking Botnet Changes Up Tactics

The Lemon Duck cryptocurrency-mining botnet has added the ProxyLogon group of exploits to its bag of tricks, targeting Microsoft Exchange servers. That’s according to researchers at Cisco Talos, who said that the cybercrime group behind Lemon Duck has also added the Cobalt Strike attack framework...

Guidance for responders: Investigating and remediating on-premises Exchange Server vulnerabilities

This guidance will help customers address threats taking advantage of the recently disclosed Microsoft Exchange Server on-premises vulnerabilities CVE-2021-26855, CVE-2021-26858, CVE-2021-26857, and CVE-2021-27065. Microsoft will continue to monitor these threats and provide updated tools and...

Guidance for responders: Investigating and remediating on-premises Exchange Server vulnerabilities

This guidance will help customers address threats taking advantage of the recently disclosed Microsoft Exchange Server on-premises vulnerabilities CVE-2021-26855, CVE-2021-26858, CVE-2021-26857, and CVE-2021-27065, which are being exploited. We strongly urge customers to immediately update system...

Guidance for responders: Investigating and remediating on-premises Exchange Server vulnerabilities

This guidance will help customers address threats taking advantage of the recently disclosed Microsoft Exchange Server on-premises vulnerabilities CVE-2021-26855, CVE-2021-26858, CVE-2021-26857, and CVE-2021-27065, which are being exploited. We strongly urge customers to immediately update system...

How Akamai Can Help You Fight the Latest Exploitation Attempts Against Microsoft Exchange

Co-authored by Ryan Barnett. AppSec Protections for Microsoft Exchange CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, CVE-2021-27065 On March 2, 2021, the Microsoft Security Response Center alerted its customers to several critical security updates to Microsoft Exchange Server, addressing...

Threat Advisory: HAFNIUM and Microsoft Exchange zero-day

Microsoft released patches for four vulnerabilities in Exchange Server on March 2, disclosing that these vulnerabilities were being exploited by a previously unknown threat actor, referred to as HAFNIUM. The vulnerabilities in question — CVE-2021-26855, CVE-2021-26857, CVE-2021-26858 and...

Detection and Response to Exploitation of Microsoft Exchange Zero-Day Vulnerabilities

Beginning in January 2021, Mandiant Managed Defense observed multiple instances of abuse of Microsoft Exchange Server within at least one client environment. The observed activity included creation of web shells for persistent access, remote code execution, and reconnaissance for endpoint securit...

Microsoft Exchange Server Zero-Days (ProxyLogon) – Automatically Discover, Prioritize and Remediate Using Qualys VMDR

Update March 10, 2021: A new section describes how to respond with mitigation controls if patches cannot be applied, as recommended by Microsoft. This section details the Qualys Policy Compliance control ids for each vulnerability. Update March 8, 2021: Qualys has released an additional QID: 5010...

Microsoft Exchange 0-Day Attackers Spy on U.S. Targets

Microsoft has spotted multiple zero-day exploits in the wild being used to attack on-premises versions of Microsoft Exchange Server. Adversaries have been able to access email accounts, steal a raft of data and drop malware on target machines for long-term remote access, according to the computin...

Patch now! Exchange servers attacked by Hafnium zero-days

Microsoft has detected multiple zero-day exploits being used to attack on-premises versions of Microsoft Exchange Server in limited and targeted attacks. Microsoft attributes the attacks to a group they have dubbed Hafnium. “HAFNIUM primarily targets entities in the United States across a number ...

CVE-2021-26858

creationtimestamp| type| source ---|---|--- 2021-03-03 02:44:45+00:00| seen| https://t.me/cibsecurity/24377 2021-03-03 04:00:00+00:00| seen| https://www.govcert.gov.hk/en/alertsdetail.php?id=556 2021-03-03 06:31:11+00:00| seen| MISP/76591c3b-efb3-4084-a644-87a6cca8c784 2021-03-03 15:38:55+00:00|...

CVE-2021-26858

Microsoft Exchange Server Remote Code Execution Vulnerability...

Security Updates for Microsoft Exchange Server (March 2021)

The Microsoft Exchange Server installed on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities: - A remote code execution vulnerability. An attacker could exploit this to execute unauthorized arbitrary code. CVE-2021-26412, CVE-2021-26854,...

CVE-2021-26858

Microsoft Exchange Server Remote Code Execution Vulnerability Recent assessments: Assessed Attacker Value: 0 Assessed Attacker Value: 0Assessed Attacker Value: 0...

CVE-2021-26858

CVE-2021-26858 (Microsoft Exchange Server) is discussed in connected material as a post-authentication issue enabling manipulation of voicemail header files. The AVLEONOV writeup explains a crafted header can be parsed to deserialize a malicious ContactInfo object, using a TypedBinaryFormatter wi...

Microsoft Exchange Server Remote Code Execution (CVE-2021-26857; CVE-2021-26858)

A remote code execution vulnerability exists in Microsoft Microsoft Exchange. Successful exploitation of this vulnerability could allow a remote attacker to execute arbitrary code on the affected system...

VulnCheck KEV: CVE-2021-26858

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain...