This module uses a path confusion that leads to an authentication bypass (ACL) which allows unauthenticated access to an arbitrary backend URL. Then an elevation of privilege present in CommonAccessTokenFromUrl of RemotePowershellBackendCmdletProxyModule.cs is used to execute Exchange powershell commands as Exchange Administrator. Finally, an arbitrary file write present in the New-MailboxExportRequest Exchange powershell command is used to write a webshell in the system file. The deployed agent will run with the SYSTEM privileges.
The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit bounds, which could be turned into out of bounds reads and writes in the Linux kernel and therefore, arbitrary code execution. This issue was fixed via commit 049c4e13714e ("bpf: Fix alu32 const subreg bound tracking on bitwise operations") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. The AND/OR issues were introduced by commit 3f50f132d840 ("bpf: Verifier, do explicit ALU32 bounds tracking") (5.7-rc1) and the XOR variant was introduced by 2921c90d4718 ("bpf:Fix a verifier failure with xor") ( 5.10-rc1).