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Dec 21, 2021

CAST: CrowdStrike Archive Scan Tool

This tool is a quick scanner to walk filesystems looking for vulnerable versions of log4j. Please see our blog post here for more detailed discussion.

Currently, it scans a given set of directories for JAR, WAR, ZIP, or EAR files, then scans for files therein matching a known set of checksums.

Releases

See the releases page for a list of downloads

Support

As free, as-is tool this software is not officially supported by CrowdStrike. As such we ask that you please refrain from sending inquiries to the CrowdStrike support team. The project maintainers will be working with active community contributors to address bugs and supply new features. If you have identified a bug please submit an issue through GitHub.

Deployment

Please see the deploy directory for scripts and guidance.

Usage

This tool currently has two verbs: "version" and "scan"

# ./cast version
version: 0.5.1, commit: d8d184fc49315e19f0d37015ed95ae500b2cca1d, date: 2021-12-22T19:41:22Z, builtBy: unknown
# ./cast scan -h
Usage of ./cast:
  -maxmem uint
         maximum sub-archive size to recurse (default 104857600)
  -recursion uint
         maximum in-memory in-archive recursion (0 disables) (default 3)
  -xdev
         do not cross device boundaries (POSIX-only)

The options should be fairly self-explanatory, but some clarification:

  • maxmem is specified in bytes only, no human sizes for now
  • a recursion of 0 will disable sub-archive scanning, but will still check inside of any first-tier ZIP archive it encounters.
  • xdev is only working on POSIX platforms today

An example of running against both a ZIP file and a set of directories

./cast scan -maxmem 1000000 -recursion 1 ~/tmp/zzz.zip /tmp ./

Note that you can specify individual files AND/OR directories to recurse. This enables leveraging preindexed filesystems, e.g.:

locate -0 *.jar | xargs -0 ./cast scan

Sample output

{"container":"~/tmp/zzz.zip","member":{"path":"/log4j-core-2.13.3.jar/org/apache/logging/log4j/core/net/JndiManager.class","size":4885,"modified":"2020-05-10T12:08:46Z"},"sha256":"c3e95da6542945c1a096b308bf65bbd7fcb96e3d201e5a2257d85d4dedc6a078"}
{"container":"~/tmp/zzz.zip","member":{"path":"/log4j-core-2.13.3.jar/org/apache/logging/log4j/core/util/NetUtils.class","size":4315,"modified":"2020-05-10T12:08:44Z"},"sha256":"f96e82093706592b7c9009c1472f588fc2222835ea808ee2fa3e47185a4eba70"}

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CrowdStrike Archive Scan Tool

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