MS.Exchange.Validation.Key.ViewState.Remote.Code.Execution

Description

This indicates an attack attempt to exploit a Remote Code Execution Vulnerability in Microsoft Exchange Server.
The vulnerability is due to insecure keys. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted HTTP request.

Outbreak Alert

A suspected Iran-linked espionage group tracked as UNC1549 is actively targeting aerospace, defense, and telecommunications organizations across Europe and other regions. The threat actor employs a combination of highly tailored spear-phishing, credential theft from third-party services, and the abuse of virtual desktop infrastructure such as Citrix, VMware, and Azure VDI to gain initial access and move laterally within target networks.

View the full Outbreak Alert Report

This report provides an overview of ongoing Iran-linked cyber operations, highlighting activity attributed to state-aligned proxies and hacktivist groups. The vulnerabilities listed are suspected to be exploited by actors associated with Iran in real-world campaigns, consistent with observed tactics, techniques, and procedures (TTPs). Iran-linked operations continue to rely on distributed, lower-complexity techniques, including phishing, DDoS, data exfiltration, and destructive attacks. Initial access is primarily achieved through exploitation of known, unpatched vulnerabilities and exposed edge infrastructure, reflecting a persistent and opportunistic threat posture targeting government, critical infrastructure, and enterprise environments.

View the full Outbreak Alert Report

Affected Products

Microsoft Exchange Server 2013 Cumulative Update 23
Microsoft Exchange Server 2019 Cumulative Update 3
Microsoft Exchange Server 2016 Cumulative Update 14
Microsoft Exchange Server 2016 Cumulative Update 15
Microsoft Exchange Server 2019 Cumulative Update 4
Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 30

Impact

System Compromise: Remote attackers can gain control of vulnerable systems.

Recommended Actions

Apply the most recent upgrade or patch from the vendor.
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0688

References