[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Wed, 18 May 2011 18:53:23 +0200
From: yersinia <yersinia.spiros@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: Multiple libraries privilege checking
On Mon, May 16, 2011 at 8:56 PM, Solar Designer <solar@...nwall.com> wrote:
> On Mon, May 16, 2011 at 04:27:41PM +0200, Sebastian Krahmer wrote:
> > Its probably about time to review libraries that are commonly
> > linked to (formerly-) suid programs, such as
> > libldap, libssl etc. In near future, in the advent of file caps
> > they are often lacking proper checks.
>
> Good idea.
>
> > They usually just compare uid against euid (not even gid sometimes)
> > and do not check the dumpable flag or AT_SECURE (dont know whether
> > glibc exports a proper function to easily check that at all).
>
> glibc exports the __libc_enable_secure variable, which is initialized
> based on AT_* including AT_SECURE. It also exports __secure_getenv().
>
> > The libraries that I had a quick look at and which were found
> > "vulnerable" are:
> >
> > - openssl-1.0.0c
>
> We've been patching OpenSSL to use __libc_enable_secure for over 10
> years now. ;-) The patch is in use at least in Owl and ALT Linux.
>
> * Sun Apr 22 2001 Solar Designer <solar-at-owl.openwall.com>
> ...
> - Use glibc's __libc_enable_secure for the new OPENSSL_issetugid().
>
> I've attached our patches for OpenSSL, ncurses, S-Lang, termcap, rpm's
> popt. Of these, OpenSSL and ncurses apply to recent versions, termcap
> is old by itself, whereas the rest might be obsoleted by changes made
> upstream (and they're not strictly for the problem you brought up).
>
> For OpenSSL, there's another problem: it looks like some getenv()'s
> were added after the initial introduction of OPENSSL_issetugid() and
> without consideration for possible security implications. Some of those
> should be patched. This got on my to-do when we updated to OpenSSL
> 1.0.0d earlier this year - to do myself or delegate, but I never got
> around to... Maybe you're the one to look into this and come up with a
> patch now? ;-)
>
It happens that I am, with another name, an rpm5/popt comantainer . I am very
interested to integrate these patches, being also a security
professional. Very
useful to follow this mailing list, but I am not part of a distro, at least
for now, and I can no longer follow it in the future due to the recent
policy change. Thanks anyway.
Elia
>
> Thanks,
>
>
> Alexander
>
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
