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Date: Tue, 25 Feb 2020 19:15:38 +0100
From: Amadeusz Sławiński <amade@...blr.net>
To: Salvatore Bonaccorso <carnil@...ian.org>
Cc: oss-security@...ts.openwall.com
Subject: Re: GNU screen "out of bounds access when setting
w_xtermosc after OSC 49"
On Tue, 25 Feb 2020 14:05:33 +0100
Salvatore Bonaccorso <carnil@...ian.org> wrote:
> Hi
>
> On Thu, Feb 06, 2020 at 03:04:18PM +0100, Solar Designer wrote:
> > Hi,
> >
> > GNU screen 4.8.0 was released yesterday with a documented security fix
> > in it:
> >
> > https://lists.gnu.org/archive/html/screen-devel/2020-02/msg00007.html
> >
> > ---
> > From: Amadeusz Slawinski
> > Subject: [screen-devel] GNU Screen v.4.8.0
> > Date: Wed, 5 Feb 2020 21:45:35 +0100
> >
> > Hello everyone,
> >
> > I'm announcing availability of GNU Screen v.4.8.0
> >
> > Screen is a full-screen window manager that multiplexes a physical
> > terminal between several processes, typically interactive shells.
> >
> > This release
> > * Improves startup time by only polling for already open files to
> > close
> > * Fixes:
> > - Fix for segfault if termcap doesn't have Km entry
> > - Make screen exit code be 0 when checking --version
> > - Fix potential memory corruption when using OSC 49
> >
> > As last fix, fixes potential memory overwrite of quite big size (~768
> > bytes), and even though I'm not sure about potential exploitability of
> > that issue, I highly recommend everyone to upgrade as soon as possible.
> > This issue is present at least since v.4.2.0 (haven't checked earlier).
> > Thanks to pippin who brought this to my attention.
>
> Regarding the affected versions,
> https://bugzilla.redhat.com/show_bug.cgi?id=1801405#c6 points out that
> the issue is caused by the upsteram commit
> https://git.savannah.gnu.org/cgit/screen.git/commit/?h=screen-v4&id=c5db181b6e017cfccb8d7842ce140e59294d9f62
> which would be only in v4.7.0.
>
> Is this correct?
>
Right, that seems correct.
There is also another fix that should've been made:
https://git.savannah.gnu.org/cgit/screen.git/commit/?id=b14e76eb5d6be889d58e37e420384e59a74eddd6
Will try to release 4.8.1 with it soon.
Amadeusz
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