Detections
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5.1 Ensure that WildFire file size upload limits are maximized
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The default file size limits on the firewall are designed to include the majority of malware in the wild (which is smaller than the default size limits) and to exclude large files that are very unlikely to be malicious and that can impact WildFire file-forwarding capacity.Rationale:
Because the firewall has a specific capacity reserved to forward files for WildFire analysis, forwarding high numbers of large files can cause the firewall to skip forwarding of some files. This condition occurs when the maximum file size limits are configured for a file type that is traversing the firewall at a high rate. In this case, a potentially malicious file might not get forwarded for WildFire analysis. Consider this possible condition if you would like to increase the size limit for files other than PEs beyond their default size limit.
Impact:
Using larger file filtering can cause the system to skip files in the event multiple larger files are sent.
NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.
Solution
Navigate to Device > Setup > WildFire.Click the General Settings edit icon.
Set the maximum size for each file type are larger than the defaults, to a size that is as large enough to account for 'large' files, but not large enough to affect performance of the hardware.
In PAN-OS 9.x and higher, the default file sizes for WildFire are:
pe (Portable Executable) - 16MB
apk (Android Application)- 10MB
pdf (Portable Document Format) - 3072KB
ms-office (Microsoft Office) - 16384KB
jar (Packaged Java class file) - 5MB
flash (Adobe Flash) - 5MB
MacOSX (DMG/MAC-APP/MACH-O PKG files) - 10MB
archive (RAR and 7z files) - 50MB
linux (ELF files) - 50MB
script (JScript, VBScript, PowerShell, and Shell Script)- 20KB
In PAN-OS 9.x and higher, the maximum file sizes for Wildfire are:
pe (Portable Executable) - 50MB
apk (Android Application)- 50MB
pdf (Portable Document Format) - 51200KB
ms-office (Microsoft Office) - 51200KB
jar (Packaged Java class file) - 20MB
flash (Adobe Flash) - 10MB
MacOSX (DMG/MAC-APP/MACH-O PKG files) - 50MB
archive (RAR and 7z files) - 50MB
linux (ELF files) - 50MB
script (JScript, VBScript, PowerShell, and Shell Script)- 4096KB
Default Value:
In PAN-OS 9.x, the default file sizes for WildFire are:
pe (Portable Executable) - 16MB
apk (Android Application)- 10MB
pdf (Portable Document Format) - 3072KB
ms-office (Microsoft Office) - 16384KB
jar (Packaged Java class file) - 5MB
flash (Adobe Flash) - 5MB
MacOSX (DMG/MAC-APP/MACH-O PKG files) - 10MB
archive (RAR and 7z files) - 50MB
linux (ELF files) - 50MB
script (JScript, VBScript, PowerShell, and Shell Script)- 20KB
See Also
Item Details
Audit Name: CIS Palo Alto Firewall 11 v1.0.0 L1
References: CSCv7|8
Plugin: Palo_Alto
Control ID: 6b813ea3a8f1d03cb307bd9516a14c952d6d5261a948fe533fde2a74cf5dcffa