Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Tue, 17 Oct 2017 18:25:07 +0200
From: Bastian Blank <>
Subject: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script

Hi folks

ftpsync is the tool we use to mirror Debian everywhere.  It uses rsync
to do the heavy lifting.

rsync can copy symlinks.  We enable this option, as the Debian tree
includes symlinks in various of locations.  Unless a special option
(--safe-links) is given, such symlinks can point to arbitrary locations,
even outside of the mirror tree.

An attacker with the ability to add symlinks to the upstream mirror can
create symlinks to arbitrary files or even directories.  Depending on
the config, a HTTP server will follow such symlinks.

Upstream patch:


Beam me up, Scotty!

Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.