Automated Audit using SKIPFISH
Last revision (mm/dd/yy): 07/04/2012
This type of article aims to provide to development team a easy/quick way to perform automated audit tests against their web application projects over implementation phase.
This page have to objective to show a SKIFISH sample script to automate audit of a web application.
Description taken from website:
Skipfish is an active web application security reconnaissance tool. It prepares an interactive sitemap for the targeted site by carrying out a recursive crawl and dictionary-based probes. The resulting map is then annotated with the output from a number of active (but hopefully non-disruptive) security checks. The final report generated by the tool is meant to serve as a foundation for professional web application security assessments.
This script do not replace a manual audit but can be useful to perform a first validation.
#/bin/sh #Define global variables REPORT_DIR=/tmp/skipfish-report URI_TO_IGNORE=/css/,/img/,/images/,/js/,/doc/ TARGET_URL=http://mysite.com TARGET_ROOT_URL=$TARGET_URL INTERACTIVE_MODE=YES # #Clean up report directory if exists... # if [ -d $REPORT_DIR ]; then rm -rf $REPORT_DIR fi # #Initialize custom dictionary if do not exists... # if [ ! -f dictionaries/custom-dictionnary.wl ]; then touch dictionaries/custom-dictionnary.wl fi # #Define running mode (interactive or quiet) # if [ "$INTERACTIVE_MODE" = "YES" ]; then RUNNING_MODE="" else RUNNING_MODE="-u" fi # #Start scan... # skipfish -b i -I $TARGET_ROOT_URL -X $URI_TO_IGNORE -Z -o $REPORT_DIR -M -Q $RUNNING_MODE -S dictionaries/extensions-only.wl -W dictionaries/custom-dictionnary.wl -Y -R 5 -G 256 -l 3 -g 10 -m 10 -f 20 -t 60 -w 60 -i 60 -s 1024000 -e $TARGET_URL #
Global variables description:
- REPORT_DIR: Target directory in which SkipFish will generate the scan report.
- URI_TO_IGNORE: Comma separated uri list that the scan must ignore.
- TARGET_URL: Target application url.
- TARGET_ROOT_URL: Root url of the application (used to limit scan to the application).
- INTERACTIVE_MODE: Used to indicate to SkipFish to run in interactive or quiet mode (no realtime progress statitics for quiet mode).
Options used to specify authentication and access behaviors:
- -b: Use headers consistent with MSIE.
Options used to specify crawl scope behaviors:
- -I: Only follow URLs matching url specified in $TARGET_ROOT_URL variable.
- -X: Exclude URLs matching uri specified in $URI_TO_IGNORE variable.
- -Z: Do not descend into 5xx locations.
Options used to specify reporting behaviors:
- -o: Write output to directory specified in $REPORT_DIR variable.
- -M: Log warnings about mixed content / non-SSL passwords.
- -Q: Completely suppress duplicate nodes in reports.
- -u: Be quiet, disable realtime progress stats.
Options used to specify dictionary management behaviors:
Here we configure scan to learn from the application scan and keep informations found for the next scan of the application. We also seed learning with a dictionary containing only extension element that the scan must use to discover files...
- -S: Load a supplemental read-only wordlist, is the seeding dictionnary.
- -W: Use a specified read-write wordlist , is the dictionary built using the informations gathered during the scan.
- -Y: Do not fuzz extensions in directory brute-force.
- -R: Purge, into the dictionary built from applicatin scan, words hit more than 5 scans ago.
- -G: Maximum number of keyword guesses to keep, here we keep 256 keywords.
Options used to specify performance settings:
- -l: Max requests per second, here we limit to 3.
- -g: Max simultaneous TCP connections, here we limit to 10.
- -m: Max simultaneous connections, per target IP, here we limit to 10.
- -f: Max number of consecutive HTTP errors, here we limit to 20.
- -t: Total request response timeout, here we limit to 1 minute.
- -w: Individual network I/O timeout, here we limit to 1 minute.
- -i: Timeout on idle HTTP connections, here we limit to 1 minute.
- -s: Response size limit, here we limit to 1024 Kb.
- -e: Do not keep binary responses for reporting.
Interactive mode & report
The interactive mode give realtime progress stats of the scan:
SkipFish generate an HTML report website like this:
Remark about scan scheduling
The scan take a while then it's recommended to schedule is execution:
- During the night for a daily audit case.
- During the week-end for a weekly audit case.