![]() These remote files can also lead to very long network delaysĮssentially preventing the search from completing at all! These remote filesystems which may be absolutely huge. Running a large recursive search may recurse into Many servers have distributed filesystems mounted at various points in To unintended loops especially when recursing through the /proc Track of visited inodes in order to detect cycles. Velociraptor’s glob() plugin does follow links by default, but keeps It is possible to miss important files (for example many serversĬontain symlinks to data drives so starting a find from /var/www This is probably the reason why find’s default behavior is to This can lead to huge CPUĬonsumption on the target system and spinning out of control programs. Using a tool that has no ability to constrain the time, CPU usage or This is particularly dangerous when running this program remotely Such a program will never complete because each item in proc will causeįind to recurse through the entire filesystem until recursively To follow symbolic links: # find -L /proc a process’sįor example the below snippet can be seen with find, when instructed The /proc filesystem, which contains links to / (e.g. This is particularly problematic when recursing through Higher place in the directory tree, leading to a symbolic link cycle.Ī program that blindly follows links may become trapped in a symbolic Link points to, there is a danger that the link points back to a If one follows the symbolic link and recurse into a directory which a Needs to decide if to follow the symbolic link or not. When walking the files in a directory, one Kept in mind when writing custom one off scripts, or new VelociraptorĪ symbolic link is a special type of filesystem object which points atĪnother file or directory. Some of these issues may present performance problems so should be I wanted to share some of the potential pitfalls that one mayĮncounter searching the filesystem in the real world. Of scripts and single use tools were published that could search theįilesystem for vulnerable jar files (e.g. ![]() To identify the presence of vulnerable software on servers. The high severity and ease of exploitation many blue teamers scrambled The Log4j vulnerability has been published in December 2021. ![]() For example inįollowing discussion applies equally to all methods and is also Most programming languages have similar features. The find native Linux command allows searching the filesystem, and This capability is also available in many other tools, for example, ![]() Glob() plugin, that uses a glob expressions (containing wild cards) In Velociraptor this capability is available through the ![]() Many DFIR tasks involve simply searching the filesystem for certainįiles. Earlier releases may not have the same features. This article discusses new features appearing in Velociraptor’s 0.6.3 ![]()
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