full-disclosure - Using second gpg keyring may be misleading?

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Message-ID: <20120614141749.GD2776@sivokote.iziade.m$>
Date: Thu, 14 Jun 2012 17:17:49 +0300
From: Georgi Guninski <guninski@...inski.com>
To: full-disclosure@...ts.grok.org.uk
Subject: Using second gpg keyring may be misleading?

There is chance someone exploits this in apt-key...

Attached is a keyring and here is the output:

$rm -rf /home/joro2/.gnupg/ ; gpg --import /usr/share/keyrings/ubuntu-master-keyring.gpg ; gpg --check-sigs --keyring /tmp/sec3
gpg:               imported: 1  (RSA: 1)
gpg: no ultimately trusted keys found
/home/joro2/.gnupg/pubring.gpg
------------------------------
pub   4096R/3F272F5B 2007-11-09
uid                  Ubuntu Archive Master Signing Key <ftpmaster@...ntu.com>
sig!3        3F272F5B 2007-11-09  Ubuntu Archive Master Signing Key <ftpmaster@...ntu.com>

/tmp/sec3
---------
pub   1024R/B1C08810 2012-06-14
uid                  kkkkkkk5 <k@k>
sig!3        B1C08810 2012-06-14  [User ID not found]
sig!         3F272F5B 2012-06-14  Ubuntu Archive Master Signing Key <ftpmaster@...ntu.com>
sig!         3F272F5B 2012-06-14  Ubuntu Archive Master Signing Key <ftpmaster@...ntu.com>
sub   1024R/0354AE88 2012-06-14
sig!         B1C08810 2012-06-14  [User ID not found]
sub   2179R/3F272F5B 2012-06-14
sig!         B1C08810 2012-06-14  [User ID not found]

1 signature not checked due to a missing key


$rm -rf /home/joro2/.gnupg/ ; gpg --import /usr/share/keyrings/ubuntu-master-keyring.gpg ; gpg --no-default-keyring --check-sigs --keyring /tmp/sec3

gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
gpg: no ultimately trusted keys found
/tmp/sec3
---------
pub   1024R/B1C08810 2012-06-14
uid                  kkkkkkk5 <k@k>
sig!3        B1C08810 2012-06-14  kkkkkkk5 <k@k>
sig!         3F272F5B 2012-06-14  kkkkkkk5 <k@k>
sig!         3F272F5B 2012-06-14  kkkkkkk5 <k@k>
sub   1024R/0354AE88 2012-06-14
sig!         B1C08810 2012-06-14  kkkkkkk5 <k@k>
sub   2179R/3F272F5B 2012-06-14
sig!         B1C08810 2012-06-14  kkkkkkk5 <k@k>


Download attachment "sec3" of type "application/octet-stream" (2033 bytes)

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