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Re: CVE request: mumble local information disclosure
From: Ludwig Nussel <ludwig.nussel () suse de>
Date: Thu, 16 Feb 2012 15:35:55 +0100

Vincent Danen wrote:
It was discovered that mumble created its database file
(~/.local/share/data/Mumble/.mumble.sqlite) with insecure world-readable
permissions.  If the user had (non-default) permissions on their home
directory, another local user could obtain password and configuration
settings from the database file.

It certainly makes sense for cautios applications to make sure sensitive
settings have restricted access permissions. Question is whether it is
actually a vulnerability if they don't. Quoting the XDG spec¹

| If, when attempting to write a file, the destination directory is
| non-existant an attempt should be made to create it with permission
| 0700. If the destination directory exists already the permissions should
| not be changed.

So it could be argued that mumble just relied on the specification that
already mandates restrictive permissions on ~/.config.

The program that is supposed to create ~/.config on login had a bug that
made the dir 755 in violation of the spec². Fixing the permissions is
not allowed according to the spec though ...


[1] http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
[2] https://bugs.freedesktop.org/show_bug.cgi?id=36773

 (o_   Ludwig Nussel
 V_/_  http://www.suse.de/
SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg) 

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