Date: Fri, 21 Sep 2012 12:37:00 +0200 From: Tomas Mraz <tmraz@...hat.com> To: Matthias Weckbecker <mweckbecker@...e.de> Cc: oss-security@...ts.openwall.com, vcizek@...e.de Subject: Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files On Fri, 2012-09-21 at 12:20 +0200, Matthias Weckbecker wrote: > Hello Steve, Kurt, Vitezslav, Tomas, vendors, > > we have recently been notified about a potential issue with gpg: When files > are en/de-crypted the result is written world-readable by default. > Short example (quote from ): > > # de-crypting > % gpg sikrit.gpg > % ll sikrit* > -rw-r--r-- 1 gp users 12 Sep 17 09:41 sikrit > -rw------- 1 gp users 480 Sep 17 09:40 sikrit.gpg > # en-crypting > % echo "my password" > sikrit > % chmod go= sikrit > % ll sikrit > -rw------- 1 gp users 12 Sep 17 09:38 sikrit > % gpg -e -r pfeifer sikrit > % wipe sikrit > % ll sikrit.gpg > -rw-r--r-- 1 gp users 480 Sep 17 09:40 sikrit.gpg > >  https://bugzilla.novell.com/show_bug.cgi?id=780943 > > Wouldn't one usually expect files that were previously encrypted to contain > sensitive content (that's probably why content is encrypted at all)? And if > so, shouldn't such files be only readable by certain users / group of users > by default? Otherwise, a file that is e.g. decrypted in /tmp might leak due > to the file permissions being too loose. > > I'm not quite sure whether to assign a CVE for this, so I thought I'd just > add a question mark behind the subject and let the list (and Kurt) decide. I suppose the permissions respect the user's umask so I do not think this is a real security issue in the gpg itself. Although using the permissions of the original file when creating the decrypted/encrypted one (still modified with the user's umask) would be more appropriate. So in my opinion this does not warrant a CVE but improvement in the upstream gnupg code would be appreciated I think. -- Tomas Mraz No matter how far down the wrong road you've gone, turn back. Turkish proverb
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