From: Junio C Hamano <gitster@pobox.com>
To: Emily Shaffer <emilyshaffer@google.com>
Cc: "Taylor Blau" <me@ttaylorr.com>,
"Glen Choo" <chooglen@google.com>,
"Git List" <git@vger.kernel.org>,
justin@justinsteven.com,
"Johannes Schindelin" <Johannes.Schindelin@gmx.de>,
"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
"Derrick Stolee" <derrickstolee@github.com>,
"brian m. carlson" <sandals@crustytoothpaste.net>,
"Randall S. Becker" <rsbecker@nexbridge.com>
Subject: Re: Bare repositories in the working tree are a security risk
Date: Thu, 21 Apr 2022 11:47:34 -0700 [thread overview]
Message-ID: <xmqq4k2mi88p.fsf@gitster.g> (raw)
In-Reply-To: <CAJoAoZkf6VuAOwX9j8Zc0x4HqJRJ5zQgqfmu+8Zs1kVx88dGpg@mail.gmail.com> (Emily Shaffer's message of "Thu, 21 Apr 2022 11:29:15 -0700")
Emily Shaffer <emilyshaffer@google.com> writes:
>> Nice - a more strict spin on proposal 3 from above, if I understand it
>> right. Rather than allowing any and all bare repos, avoid someone
>> sneaking in a malicious one next to legitimate ones by using an
>> allowlist. Seems reasonable to me.
>
> Ah, another thing I forgot to mention. There has been a little
> discussion in the past about isolating "safe" parts of config (and
> gitdir) from "unsafe" parts, e.g. "which configs and embedded scripts
> are executables", to help better protect from zipfile-type attacks,
> which are very similar to this kind of attack. I wonder if it makes
> sense to consider that sort of thing as a needswork for this bugfix?
> e.g. "/* NEEDSWORK: Only ignore unsafe configs and hooks instead of
> ignoring the entire embedded config and hooks in the future */"?
There have been such discussions in the past and they all went
nowhere because such safe-listing fundamentally does not work. What
you consider "safe" today may turn out to be "unsafe" and in a later
version of Git will stop honoring it, and for those who depended on
it being listed as "safe", such a security fix will be a regression.
Disabling the whole thing if the file can be tainted is the only
sensible way forward without promising users that they will be hurt
by such changes/regressions in the future, I would think.
So, no, I do not think such a NEEDSWORK comment is welcome.
Thanks.
next prev parent reply other threads:[~2022-04-21 18:47 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-06 22:43 Bare repositories in the working tree are a security risk Glen Choo
2022-04-06 23:22 ` [PATCH] fsck: detect bare repos in trees and warn Glen Choo
2022-04-07 12:42 ` Johannes Schindelin
2022-04-07 13:21 ` Derrick Stolee
2022-04-07 14:14 ` Ævar Arnfjörð Bjarmason
2022-04-14 20:02 ` Glen Choo
2022-04-15 12:46 ` Ævar Arnfjörð Bjarmason
2022-04-07 15:11 ` Junio C Hamano
2022-04-13 22:24 ` Glen Choo
2022-04-07 13:12 ` Ævar Arnfjörð Bjarmason
2022-04-07 15:20 ` Junio C Hamano
2022-04-07 18:38 ` Bare repositories in the working tree are a security risk John Cai
2022-04-07 21:24 ` brian m. carlson
2022-04-07 21:53 ` Justin Steven
2022-04-07 22:10 ` brian m. carlson
2022-04-07 22:40 ` rsbecker
2022-04-08 5:54 ` Junio C Hamano
2022-04-14 0:03 ` Junio C Hamano
2022-04-14 0:04 ` Glen Choo
2022-04-13 23:44 ` Glen Choo
2022-04-13 20:37 ` Glen Choo
2022-04-13 23:36 ` Junio C Hamano
2022-04-14 16:41 ` Glen Choo
2022-04-14 17:35 ` Junio C Hamano
2022-04-14 18:19 ` Junio C Hamano
2022-04-15 21:33 ` Glen Choo
2022-04-15 22:17 ` Junio C Hamano
2022-04-16 0:52 ` Taylor Blau
2022-04-15 22:43 ` Glen Choo
2022-04-15 20:13 ` Junio C Hamano
2022-04-15 23:45 ` Glen Choo
2022-04-15 23:59 ` Glen Choo
2022-04-16 1:00 ` Taylor Blau
2022-04-16 1:18 ` Junio C Hamano
2022-04-16 1:30 ` Taylor Blau
2022-04-16 0:34 ` Glen Choo
2022-04-16 0:41 ` Glen Choo
2022-04-16 1:28 ` Taylor Blau
2022-04-21 18:25 ` Emily Shaffer
2022-04-21 18:29 ` Emily Shaffer
2022-04-21 18:47 ` Junio C Hamano [this message]
2022-04-21 18:54 ` Taylor Blau
2022-04-21 19:09 ` Taylor Blau
2022-04-21 21:01 ` Emily Shaffer
2022-04-21 21:22 ` Taylor Blau
2022-04-29 23:57 ` Glen Choo
2022-04-30 1:14 ` Taylor Blau
2022-05-02 19:39 ` Glen Choo
2022-05-02 14:05 ` Philip Oakley
2022-05-02 18:50 ` Junio C Hamano
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