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Groups > linux.debian.security > #5135

Re: not getting compromised while applying apt-get upgrade for CVE-2016-1252

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On Fri, Dec 16, 2016 at 10:32:00PM +0000, Patrick Schleizer wrote:
> Julian Andres Klode:
> > (2) look at the InRelease file and see if it contains crap
> >     after you updated (if it looks OK, it's secure - you need
> >     fairly long lines to be able to break this)
> 
> Thank you for that hint, Julian!
> 
> Can you please elaborate on this? (I am asking for Qubes and Whonix
> (derivatives of Debian) build security purposes. [1])

I  added some details in that referenced bug :)

> 
> Could you please provide information on how long safe / unsafe lines are
> or how to detect them?
> 
> Ideally could you please provide some sanity check command that could be
> used to detect malicious InRelease files such as 'find /var/lib/apt
> -name '*InRelease*' -size +2M' or so?

Checking that wc -L (longest line) of the release file is reasonably small
(like 256, 512, or 1024) should be enough. Currently, it's about 140 chars
for unstable.

> 
> The problem is,
> 
> - debootstrap can only bootstrap from one source such as
> 'http://ftp.de.debian.org/debian' - which still contains vulnerable apt.
> (Correct me if I am wrong, I would hope to be wrong on that one.)

Right now yes. That will contain a new APT in a point release. That said,
there might be issues in debootstrap's Release file verification, someone
should check that...


-- 
Debian Developer - deb.li/jak | jak-linux.org - free software dev
                  |  Ubuntu Core Developer |
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Thread

not getting compromised while applying apt-get upgrade for  CVE-2016-1252 Patrick Schleizer <adrelanos@riseup.net> - 2016-12-15 21:40 +0100
  Re: not getting compromised while applying apt-get upgrade for  CVE-2016-1252 SZÉPE Viktor <viktor@szepe.net> - 2016-12-15 21:50 +0100
    Re: not getting compromised while applying apt-get upgrade for  CVE-2016-1252 Geert Stappers <stappers@stappers.nl> - 2016-12-16 07:00 +0100
      Re: not getting compromised while applying apt-get upgrade for  CVE-2016-1252 Patrick Schleizer <adrelanos@riseup.net> - 2016-12-16 15:20 +0100
      Re: not getting compromised while applying apt-get upgrade for  CVE-2016-1252 SZÉPE Viktor <viktor@szepe.net> - 2016-12-16 15:50 +0100
  Re: not getting compromised while applying apt-get upgrade for CVE-2016-1252 Paul Wise <pabs@debian.org> - 2016-12-16 00:40 +0100
  Re: not getting compromised while applying apt-get upgrade for  CVE-2016-1252 Julian Andres Klode <jak@debian.org> - 2016-12-16 00:40 +0100
    Re: not getting compromised while applying apt-get upgrade for  CVE-2016-1252 Patrick Schleizer <adrelanos@riseup.net> - 2016-12-16 23:40 +0100
      Re: not getting compromised while applying apt-get upgrade for  CVE-2016-1252 Julian Andres Klode <jak@debian.org> - 2016-12-17 00:30 +0100
        Re: [qubes-devel] Re: not getting compromised while applying apt-get  upgrade for CVE-2016-1252 Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> - 2016-12-17 01:00 +0100
      Re: not getting compromised while applying apt-get upgrade for  CVE-2016-1252 David Kalnischkies <david@kalnischkies.de> - 2016-12-17 02:50 +0100
        Re: [qubes-devel] Re: not getting compromised while applying apt-get  upgrade for CVE-2016-1252 Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> - 2016-12-17 05:10 +0100
          Re: [qubes-devel] Re: not getting compromised while applying  apt-get upgrade for CVE-2016-1252 "Adam D. Barratt" <adam@adam-barratt.org.uk> - 2016-12-17 11:20 +0100
        Re: not getting compromised while applying apt-get upgrade for  CVE-2016-1252 Patrick Schleizer <adrelanos@riseup.net> - 2016-12-20 00:30 +0100
          Re: [qubes-devel] Re: not getting compromised while applying apt-get  upgrade for CVE-2016-1252 Chris Laprise <tasket@openmailbox.org> - 2016-12-20 03:40 +0100
      Re: not getting compromised while applying apt-get upgrade for  CVE-2016-1252 Hans-Christoph Steiner <hans@at.or.at> - 2016-12-17 12:40 +0100
        Re: not getting compromised while applying apt-get upgrade for  CVE-2016-1252 Henrique de Moraes Holschuh <hmh@debian.org> - 2016-12-18 00:40 +0100

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