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Message-ID: <20130227074913.GB3756@gremlin.ru>
Date: Wed, 27 Feb 2013 11:49:13 +0400
From: gremlin@...mlin.ru
To: oss-security@...ts.openwall.com
Subject: Re: CVE request: psi+ stores the cache file as world-readable
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@...n:~ > 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@...n:~ > 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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