oss-sec mailing list archives
Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files
From: Tomas Mraz <tmraz () redhat com>
Date: Fri, 21 Sep 2012 12:37:00 +0200
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 [1]): # 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 [1] 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
Current thread:
- CVE request(?): gpg: improper file permssions set when en/de-crypting files Matthias Weckbecker (Sep 21)
- Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Dan Rosenberg (Sep 21)
- Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Matthias Weckbecker (Sep 21)
- Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Tomas Mraz (Sep 21)
- Re: Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Michael Gilbert (Sep 21)
- Re: Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Kurt Seifried (Sep 21)
- Re: Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Michael Gilbert (Sep 21)
- Re: Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Kurt Seifried (Sep 21)
- Re: Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Michael Gilbert (Sep 21)
- Re: Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Michael Gilbert (Sep 21)
- Re: Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Matthias Weckbecker (Sep 24)
- Re: Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Tavis Ormandy (Sep 24)
- Re: Re: Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Michael Gilbert (Sep 24)
- Re: Re: Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Tavis Ormandy (Sep 24)
- Re: Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Michael Gilbert (Sep 21)
- Re: CVE request(?): gpg: improper file permssions set when en/de-crypting files Dan Rosenberg (Sep 21)