This Metasploit module exploits a vulnerability in the FreeBSD kernel, when running on 64-bit Intel processors. By design, 64-bit processors following the X86-64 specification will trigger a general protection fault (GPF) when executing a SYSRET instruction with a non-canonical address in the RCX register. However, Intel processors check for a non-canonical address prior to dropping privileges, causing a GPF in privileged mode. As a result, the current userland RSP stack pointer is restored and executed, resulting in privileged code execution.
f1711c3320d7c4e9f80661d007057fb1b0b673f47fb51ec2968a821bc6aa8991FreeBSD Security Advisory - The FreeBSD operating system implements a rings model of security, where privileged operations are done in the kernel, and most applications request access to these operations by making a system call, which puts the CPU into the required privilege level and passes control to the kernel. FreeBSD/amd64 runs on CPUs from different vendors. Due to varying behaviour of CPUs in 64 bit mode a sanity check of the kernel may be insufficient when returning from a system call. Successful exploitation of the problem can lead to local kernel privilege escalation, kernel data corruption and/or crash.
50ab73e18c85232ccd993cef89e2d46586aa4f827d36aa88ad33256fe4a53d2dWhitepaper entitled Adventures with a certain Xen vulnerability (in the PVFB backend).
dc2c1f613ed2294698e11fed5a558cda1fc7acdf157f9e6e5393eec8a6b2f4d5An information disclosure vulnerability exists in the Microsoft Server service that could allow an attacker to retrieve fragments of memory from an affected host via the host's SMB server. Affected products include Microsoft Windows 2000, Microsoft Windows XP with Service Pack 1, Microsoft Windows XP with Service Pack 2, Microsoft Windows Server 2003, and Microsoft Windows Server 2003 with Service Pack 1.
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