Owassrf

OWASSRF is a software vulnerability that presents a significant security risk to Microsoft Exchange Server systems. It's an exploit method that bypasses ProxyNotShell vulnerability mitigations, allowing for remote code execution on vulnerable servers through Outlook Web Access. This vulnerability has been utilized by ransomware groups such as Cuba and Play to target the CVE-2022-41080 flaw and compromise unpatched Microsoft Exchange servers. The exploitation of OWASSRF was first reported in January 2023. The threat posed by OWASSRF extends beyond its initial discovery. The vulnerability has been used in conjunction with other known exploits like ProxyLogon, ProxyShell, and ProxyNotShell, demonstrating the evolving capabilities of malicious actors. In particular, it's suspected to be a potential infection vector for BellaCiao malware found on Exchange Servers. Despite uncertainty regarding the exact deployment method, the presence of this malware on servers indicates that attackers are leveraging one or more of these vulnerabilities. To mitigate the risks associated with OWASSRF and related vulnerabilities, organizations are advised to implement Anti-Exploitation modules and Behavioral Threat Protection. These measures offer protection against the exploitation of different vulnerabilities, including ProxyShell, ProxyLogon, and OWASSRF. As ransomware attacks continue to pose a clear danger to entities worldwide, it's crucial that organizations maintain up-to-date security protocols and ensure their systems are patched against known vulnerabilities.