oss-security - RuboCop: insecure use of /tmp

Message-ID: <20170501165444.wiaxkiauxjbgd5cx@jwilk.net>
Date: Mon, 1 May 2017 18:54:44 +0200
From: Jakub Wilk <jwilk@...lk.net>
To: oss-security@...ts.openwall.com
Subject: RuboCop: insecure use of /tmp

RuboCop stores cache files in /tmp/$UID/rubocop_cache/.
There are no ownership checks, so a malicious local users could exploit this to 
tamper with cache files belonging to other users.

Upstream bug report:
https://github.com/bbatsov/rubocop/issues/4336

I've attached PoC exploit.

-- 
Jakub Wilk

View attachment "rubocop-cache-exploit" of type "text/plain" (727 bytes)

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