[Buildroot] [PATCH 1/5] package/gvfs: fix CVE-2019-3827

Yann E. MORIN yann.morin.1998 at free.fr
Sun Mar 29 17:28:18 UTC 2020


Fabrice, All,

On 2020-03-29 19:12 +0200, Fabrice Fontaine spake thusly:
> Le dim. 29 mars 2020 à 18:49, Yann E. MORIN <yann.morin.1998 at free.fr> a écrit :
[--SNIP--]
> > Any reason why you sent one patch for each CVE, rather than a single
> > patch?
> No special reason, I thought that it'll be easier to review one by one
> instead of a single patch.

Yes, that's good.

Stil, when all a commit does is backport upstream fixes, I'm OK with a
single big commit (as long as backported patches have proper upstream
URLs, and are really left otherwise totally untouched, code-wise).

So, either way. Thanks! :-)

Regards,
Yann E. MORIN.

> > Regards,
> > Yann E. MORIN.
> >
> > > ---
> > >  ...authentication-agent-isn-t-available.patch | 46 +++++++++++++++++++
> > >  package/gvfs/gvfs.mk                          |  3 ++
> > >  2 files changed, 49 insertions(+)
> > >  create mode 100644 package/gvfs/0001-admin-Prevent-access-if-any-authentication-agent-isn-t-available.patch
> > >
> > > diff --git a/package/gvfs/0001-admin-Prevent-access-if-any-authentication-agent-isn-t-available.patch b/package/gvfs/0001-admin-Prevent-access-if-any-authentication-agent-isn-t-available.patch
> > > new file mode 100644
> > > index 0000000000..2715371534
> > > --- /dev/null
> > > +++ b/package/gvfs/0001-admin-Prevent-access-if-any-authentication-agent-isn-t-available.patch
> > > @@ -0,0 +1,46 @@
> > > +From d8d0c8c40049cfd824b2b90d0cd47914052b9811 Mon Sep 17 00:00:00 2001
> > > +From: Ondrej Holy <oholy at redhat.com>
> > > +Date: Wed, 2 Jan 2019 17:13:27 +0100
> > > +Subject: [PATCH] admin: Prevent access if any authentication agent isn't
> > > + available
> > > +
> > > +The backend currently allows to access and modify files without prompting
> > > +for password if any polkit authentication agent isn't available. This seems
> > > +isn't usually problem, because polkit agents are integral parts of
> > > +graphical environments / linux distributions. The agents can't be simply
> > > +disabled without root permissions and are automatically respawned. However,
> > > +this might be a problem in some non-standard cases.
> > > +
> > > +This affects only users which belong to wheel group (i.e. those who are
> > > +already allowed to use sudo). It doesn't allow privilege escalation for
> > > +users, who don't belong to that group.
> > > +
> > > +Let's return permission denied error also when the subject can't be
> > > +authorized by any polkit agent to prevent this behavior.
> > > +
> > > +Closes: https://gitlab.gnome.org/GNOME/gvfs/issues/355
> > > +
> > > +Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
> > > +[Retrieved from:
> > > +https://gitlab.gnome.org/GNOME/gvfs/commit/d8d0c8c40049cfd824b2b90d0cd47914052b9811]
> > > +---
> > > + daemon/gvfsbackendadmin.c | 3 +--
> > > + 1 file changed, 1 insertion(+), 2 deletions(-)
> > > +
> > > +diff --git a/daemon/gvfsbackendadmin.c b/daemon/gvfsbackendadmin.c
> > > +index ec0f2392..0f849008 100644
> > > +--- a/daemon/gvfsbackendadmin.c
> > > ++++ b/daemon/gvfsbackendadmin.c
> > > +@@ -130,8 +130,7 @@ check_permission (GVfsBackendAdmin *self,
> > > +       return FALSE;
> > > +     }
> > > +
> > > +-  is_authorized = polkit_authorization_result_get_is_authorized (result) ||
> > > +-    polkit_authorization_result_get_is_challenge (result);
> > > ++  is_authorized = polkit_authorization_result_get_is_authorized (result);
> > > +
> > > +   g_object_unref (result);
> > > +
> > > +--
> > > +2.24.1
> > > +
> > > diff --git a/package/gvfs/gvfs.mk b/package/gvfs/gvfs.mk
> > > index c380a710fb..6c927fa345 100644
> > > --- a/package/gvfs/gvfs.mk
> > > +++ b/package/gvfs/gvfs.mk
> > > @@ -15,6 +15,9 @@ GVFS_LICENSE = LGPL-2.0+
> > >  GVFS_LICENSE_FILES = COPYING
> > >  GVFS_LIBS = $(TARGET_NLS_LIBS)
> > >
> > > +# 0001-admin-Prevent-access-if-any-authentication-agent-isn-t-available.patch
> > > +GVFS_IGNORE_CVES += CVE-2019-3827
> > > +
> > >  # Export ac_cv_path_LIBGCRYPT_CONFIG unconditionally to prevent
> > >  # build system from searching the host paths.
> > >  GVFS_CONF_ENV = \
> > > --
> > > 2.25.1
> > >
> > > _______________________________________________
> > > buildroot mailing list
> > > buildroot at busybox.net
> > > http://lists.busybox.net/mailman/listinfo/buildroot
> >
> > --
> > .-----------------.--------------------.------------------.--------------------.
> > |  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
> > | +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
> > | +33 561 099 427 `------------.-------:  X  AGAINST      |  \e/  There is no  |
> > | http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v   conspiracy.  |
> > '------------------------------^-------^------------------^--------------------'
> Best Regards,
> 
> Fabrice

-- 
.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
| +33 561 099 427 `------------.-------:  X  AGAINST      |  \e/  There is no  |
| http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v   conspiracy.  |
'------------------------------^-------^------------------^--------------------'


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