oss-security - Re: CVE request: acl 2.2.47 always follows symlinks

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Message-ID: <20091223201713.GD12439@jenkins.home.ifup.org>
Date: Wed, 23 Dec 2009 12:17:13 -0800
From: Brandon Philips <brandon@...p.org>
To: Hanno Böck <hanno@...eck.de>
Cc: OSS Security List <oss-security@...ts.openwall.com>
Subject: Re: CVE request: acl 2.2.47 always follows symlinks

On 11:50 Wed 23 Dec 2009, Hanno Böck wrote:
> setfacl/getfacl (part of package acl-2.2.47) contains a bug that it ignores
> the --physical/-P parameter that means don't follow symlinks on -R
> (recursive).
> 
> This can lead to security problems, e.g. if there's a cron script giving a
> user full rwX rights for a directory, he can put a symlink there pointing to /
> or /etc or whatever.
> Another scenario would be a backup script saving the /home acls to a file,
> every user can create an endless loop for that and prevent the script from
> completing.
> 
> http://oss.sgi.com/bugzilla/show_bug.cgi?id=790
> http://bugs.gentoo.org/show_bug.cgi?id=265425
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=499076
> 
> Fixed in upstream source, but no new release yet.

Upstream for acl and attr has moved from SGI to community hosting at
savannah.gnu.org. The latest release is here:

 http://download.savannah.gnu.org/releases-noredirect/acl/acl-2.2.49.src.tar.gz

Mailing lists, git repos, and a bug system can be found here:
 http://savannah.nongnu.org/projects/acl
 http://savannah.nongnu.org/projects/attr

Thanks,

	Brandon

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