Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Wed, 22 Nov 2017 15:27:11 -0700
From: Kurt Seifried <>
Cc: Bram Moolenaar <>
Subject: Re: Re: Security risk of server side text editing ...

Can you post a summary of the issues, it sounds like more than one CVE will be needed, thanks.


> On Nov 22, 2017, at 15:17, Solar Designer <> wrote:
>> On Fri, Nov 17, 2017 at 11:35:15AM +0100, Bram Moolenaar wrote:
>> Please check out patch 8.0.1300.
> Thanks.  Personally, I don't have much to add.  This continues to do
> what I find are weird and wrong things, so any implementation issues are
> secondary to that.  I suppose you have some rationale for preserving the
> old behavior of propagating the edited file's permissions onto related
> temporary files, but I'm unaware of good reasons for that.
> If it's about users' collaboration, then I don't see a good reason for
> other users in the group, even if they could access the original file
> via group permissions, to also have access to recovery and backup files.
> As to the patch itself, aside from it propagating the possibly unsafe
> permissions on purpose (I mean unsafe such as in Hanno's original
> example, but also applying to backup files), it's also risky in
> temporarily setting umask to 0.  On some systems, this could mean libc
> or the kernel creating files with unsafe permissions if anything goes
> very wrong during this time - e.g., a coredump.  Checking st_ino is OK
> as a hardening measure, but might not always be sufficient: inode number
> reuse is possible if the original file could have been deleted.
> I suppose st_dev is not checked because of the use of O_NOFOLLOW, but I
> guess Vim can be built on systems without working O_NOFOLLOW as well?
> In case anyone wants to review the patch for real, I've attached it to
> this message, and here it is on GitHub (for expanding of the context):
> Alexander
> <8.0.1300>

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.