Tag Archives: pentagon

The Pentagon’s Brain

Requirement for access to local SMB servers makes it impossible to exploit from a sandbox. Requirement for a mount point and access to local SMB servers makes it impossible to exploit from a sandbox. Therefore it’s still possible to spoof an arbitrary PID using the local SMB server, a mount point and a suitable EA buffer. Only works if the server’s security check uses the PID in OpenProcess and doesn’t compare it directly to a running PID number. This technique uses the fact that the PID is fixed once the client connection is opened, and the process which reads and writes to the pipe doesn’t have to have the same PID. The PID is set by the named pipe file system driver (NPFS) when a new client connection is established. Fortunately the Wireshark documentation is a bit more helpful, it points out it’s a Process ID with a default of 0xFEFF. Capturing the SMB traffic in Wireshark when opening the named pipe shows the fixed value. Unfortunately since Windows 10 1709 the kernel’s handling of NTFS mount point targets was changed to allow reparsing to named pipe devices as well as more traditional file system volumes.

Once a suitable process has been created with ID 65276 you can then make a connection to the named pipe via the SMB server and if the server opens the PID it’ll get the spoofed process. If the check is made immediately after connection then there’s unlikely to be enough time to recycle the PID before the check is made. This code creates a named pipe server, waits for a new connection then calls the GetNamedPipeClientProcessId API. While researching the Access Mode Mismatch in IO Manager bug class I came across an interesting feature in named pipes which allows a server to query the connected clients PID. PID as 1234 when opening the pipe named “ABC”. The PID (and associated session ID and computer name) values are set using a generic attribute mechanism through the NpSetAttributeInList function. ABC, then the SMB server wouldn’t set the PID attribute. All that matters is if a client could spoof the PID returned by GetNamedPipeClientProcessId to refer to a process which isn’t the client the security check could be bypassed and the service exploited.

Before describing some of the techniques to spoof the PID it’d be useful to understand where the value of the PID comes from when calling GetNamedPipeClientProcessId. Potential to spoof an arbitrary PID (and session ID and computer name if desired). Can spoof the PID arbitrarily if willing to use a reimplementation of the SMB2 protocol. However I couldn’t find any first-party applications installed on Windows which used the PID for anything security related. Third-party applications are another matter and other researchers have found examples of using the PID to prevent untrusted callers from accessing privileged operations, a recent example was Check Point Anti-Virus. It was clear that there must be some applications which use the client PID for the purposes of security enforcement. This feature was introduced in Vista and is exposed to servers through the GetNamedPipeClientProcessId API, pass the API a handle to the pipe server and you’ll get back the PID of the connected client.

You get a sense that she worked for the agency for thirty years, but she does not mislead. I expect that will get rolled over until the Spring. The only real way to measure security is to track the numbers and types of compromise over time, and try to see that number decrease. Security company in London and their branches provide the essential treatment for every security matter. Listen to what each company offers. Misdemeanor crimes such as carrying a concealed weapon, assault, stalking and some narcotic offenses are pertinent to your company. They should be provided by the security company and be fitted inside the premises of the corporate companies hiring them. Firstly, if no Extended Attribute (EA) buffer is provided in the file creation request, the PID and session ID are taken from the current process. The US firm Lockheed Martin, who have provided funding for the project to date, are interested in developing a version containing a miniature sensor capable of detecting traces of the explosive TNT. Elton John shocked some concertgoers recently by directing foul language at two security guards who he spotted booting a female fan from the venue for his show. Social Security Rulings address these situations, but I am seeing more than a few denials like this anyway, with specific reference to the credibility issue.