Understanding Log4Shell: the Apache log4j2 Remote Code Execution Vulnerability (CVE-2021-44228, CVE-2021-45046)
Understanding Log4Shell: the Apache log4j2 Remote Code Execution Vulnerability (CVE-2021-44228)
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Apache CVE-2021-41773, CVE-2021-42013
We wanted to do something a little bit different with this post. Our vulnerability disclosures, exploit proof-of-concepts, and attack analysis blog posts have been awesome, but they have been catering to an offensive security audience.
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Compromising vCenter via SAML Certificates
Overview A common attack path that Horizon3 has identified across many of its customers is abusing access to the VMware vCenter Identity Provider (IdP) certificate. Security Assertion Markup Language (SAML) has proved to be a hotbed of vulnerabilities within the last year, as well as a target of many cybercrime syndicates and APTs. In the SolarWinds attack, the attackers also...
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OMIGOD – RCE Vulnerability in Multiple Azure Linux Deployments
Overview On September 14, multiple vulnerabilities were discovered by researchers at Wiz.io. The most critical of them being CVE-2021-38647, now dubbed OMIGOD, which effects the Open Management Infrastructure (OMI) agent in versions 1.6.8.0 and below. Azure customers effected by this vulnerability are still vulnerable and must take manual action to ensure the OMI agent is updated. For Debian systems (e.g., Ubuntu):...
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Confluence Server OGNL Injection: CVE-2021-26084
On August 25, 2021, Atlassian released a security advisory for CVE-2021-26084, an OGNL injection vulnerability found within a component of Confluence Server and Data Center. This critical vulnerability allows an unauthenticated attacker to execute arbitrary commands on the server. A few days later, on August 31, security researchers @iamnoob and @rootxharsh quickly developed a working proof of concept given the vulnerability details and by reverse engineering....
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ProxyShell: More Ways for More Shells
In August, Orange Tsai released details and also spoke at BlackHat and DEFCON detailing his security research into Microsoft Exchange. His latest blog post details a series of vulnerabilities dubbed ProxyShell. ProxyShell is a chain of three vulnerabilities: CVE-2021-34473 – Pre-auth Path Confusion leads to ACL Bypass CVE-2021-34523 – Elevation of Privilege on Exchange PowerShell Backend CVE-2021-31207 – Post-auth Arbitrary-File-Write leads to RCE The research detailed a...
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