Date: Fri, 21 Sep 2012 06:35:49 -0400 From: Dan Rosenberg <dan.j.rosenberg@...il.com> To: oss-security@...ts.openwall.com CC: Matthias Weckbecker <mweckbecker@...e.de>, vcizek@...e.de, tmraz@...hat.com Subject: Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files On 09/21/2012 06:20 AM, 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. GPG seems to just be honoring the umask: $ ll secret -rw------- 1 dan dan 9 Sep 21 06:31 secret $ umask 0777 $ gpg -e -r dan secret $ ll secret.gpg ---------- 1 dan dan 605 Sep 21 06:34 secret.gpg Still might be worth fixing though. -Dan
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