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Re: CVE request: psi+ stores the cache file as world-readable
From: gremlin () gremlin ru
Date: Wed, 27 Feb 2013 11:49:13 +0400

On 26-Feb-2013 19:50:48 -0800, Russ Allbery wrote:

Psi+, a fork of psi, stores its files in ~/.cache/psi+ as
world-readable.

That's normal - users' home directories are normally accessible
only by users themselves, and never by othe users:
gremlin () hren:~ > ls -ld .
drwx-----x 47 gremlin users 20480 2013-02-26 17:48 ./

That is one possible convention of many for structuring user
home directory permissions. It is certainly not universal, and
no software should assume that home directory permissions are
structured that way when deciding on the permissions of other
files created under the user's home directory.

If something is stored in the user's home directory, it's under
user's responsibility.

Some of us who have been using UNIX for long enough that we
originally learned the permissions system when sharing was
emphasized over security do still use world-readable home
directories, with specific directories under it restricted.

Yes, I also did that - in previous century :-)

We would like software, when creating private files, to not
assume that it can be careless about permissions of individual
files because "of course" the user's home directory is private.

The safer way will be not assuming anything, but instead enforce
it - at least using the restrictive umask like 077.

gremlin () hren:~ > ls -ld .ssh
drwx------ 2 gremlin users 4096 2012-12-24 12:56 .ssh/

Just in case...

-- 
Alexey V. Vissarionov aka Gremlin from Kremlin <gremlin ПРИ gremlin ТЧК ru>
GPG key ID: 0xEF3B1FA8, keyserver: hkp://subkeys.pgp.net
GPG key fingerprint: 8832 FE9F A791 F796 8AC9 6E4E 909D AC45 EF3B 1FA8


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