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Ransomware Makes use of New Exploit to Bypass ProxyNotShell Mitigations

By Ionut Arghire on December 21, 2022

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Current Play ransomware assaults concentrating on Alternate servers had been noticed utilizing a brand new exploit chain that bypasses Microsoft’s ProxyNotShell mitigations.

Just like the previous ProxyShell vulnerability, ProxyNotShell consists of two safety defects in Alternate Server: CVE-2022-41040, a server-side request forgery (SSRF) bug with a CVSS rating of 8.8; and CVE-2022-41082, a distant code execution (RCE) flaw with a CVSS rating of 8.0.

The 2 vulnerabilities had been initially reported in September, after they had been already being exploited in assaults. Microsoft addressed these bugs as a part of its November 2022 Patch Tuesday safety updates.

The ProxyNotShell exploit chain targets CVE-2022-41040 to entry the Autodiscover endpoint and attain the Alternate backend for arbitrary URLs, after which CVE-2022-41082 is exploited to execute arbitrary code. In response, Microsoft deployed a sequence of URL rewrite mitigations for the Autodiscover endpoint.

The not too long ago noticed Play ransomware assaults, nevertheless, acquire preliminary entry by the use of a brand new exploit chain – which CrowdStrike has named OWASSRF – that includes a SSRF equal to the Autodiscover approach and the exploit used within the second step of ProxyNotShell.

OWASSRF gives attackers with entry to the PowerShell remoting service by means of the Outlook Net Utility (OWA) as a substitute of Autodiscover. The assault probably exploits CVE-2022-41080, a high-severity privilege escalation flaw impacting Alternate Server 2016 and 2019, the cybersecurity agency says.

CVE-2022-41080 was resolved on November Eight alongside ProxyNotShell vulnerabilities and one other privilege escalation flaw, tracked as CVE-2022-41123, which is described as a DLL hijacking bug.

“CVE-2022-41080, has not been publicly detailed however its CVSS rating of 8.Eight is similar as CVE-2022-41040 used within the ProxyNotShell exploit chain, and it has been marked ‘exploitation extra probably’. Based mostly on these findings, CrowdStrike assesses it’s extremely probably that the OWA approach employed is the truth is tied to CVE-2022-41080,” CrowdStrike says.

Organizations are suggested to use Microsoft’s November 2022 patches as quickly as doable, to mitigate ProxyNotShell and different exploited vulnerabilities, to disable distant PowerShell for non-administrative customers, and to deploy endpoint detection and response (EDR) instruments that may detect potential exploitation makes an attempt.

Associated: Microsoft Hyperlinks Exploitation of Alternate Zero-Days to State-Sponsored Hacker Group

Associated: Microsoft Warns of New Zero-Day; No Repair But for Exploited Alternate Server Flaws

Associated: At Least 10 Menace Actors Focusing on Current Microsoft Alternate Vulnerabilities

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