Ransomware Hackers Using New Way to Bypass MS Exchange ProxyNotShell Mitigations

Threat actors affiliated with a ransomware strain known as Play are leveraging a never-before-seen exploit chain that bypasses blocking rules for ProxyNotShell flaws in Microsoft Exchange Server to achieve remote code execution (RCE) through Outlook Web Access (OWA). "The new exploit method bypasses URL rewrite mitigations for the Autodiscover endpoint," CrowdStrike researchers Brian Pitchford,

How to hack an unpatched Exchange server with rogue PowerShell code

Review your servers, your patches and your authentication policies - there's a proof-of-concept out

S3 Ep103: Scammers in the Slammer (and other stories) [Audio + Text]

Latest episode - listen and learn now (or read and revise, if the written word is your thing)...

Mitigation for Exchange Zero-Days Bypassed! Microsoft Issues New Workarounds

Microsoft has updated its mitigation measures for the newly disclosed and actively exploited zero-day flaws in Exchange Server after it was found that they could be trivially bypassed. The two vulnerabilities, tracked as CVE-2022-41040 and CVE-2022-41082, have been codenamed ProxyNotShell due to similarities to another set of flaws called ProxyShell, which the tech giant resolved last year.

ProxyNotShell – the New Proxy Hell?

Nicknamed ProxyNotShell, a new exploit used in the wild takes advantage of the recently published Microsoft Server-Side Request Forgery (SSRF) vulnerability CVE-2022-41040 and a second vulnerability, CVE-2022-41082 that allows Remote Code Execution (RCE) when PowerShell is available to unidentified attackers. Based on ProxyShell, this new zero-day abuse risk leverage a chained attack similar to

S3 Ep102.5: “ProxyNotShell” Exchange bugs – an expert speaks [Audio + Text]

Who's affected, what you can do while waiting for Microsoft's patches, and how to plan your threat hunting...