Onderwerp: Re: [Full-disclosure] Solaris 9/10 ld.so fun

Przemyslaw Frasunek wrote:
> ld.so from Solaris 9 and 10 doesn't check LD_AUDIT environment variable when
> running s[ug]id binaries, allowing to run arbitrary code with elevated
> privileges. Well, I can't belive, that such trivial vulnerability exists in
> modern OS...
[...]

Oh, well, it's not the end of fun with ldso.

atari:venglin:~> setenv LD_AUDIT :
atari:venglin:~> su
Segmentation fault
atari:venglin:~> unsetenv LD_AUDIT
atari:venglin:~> setenv LD_AUDIT `perl -e 'print "A"x1024'`
atari:venglin:~> su
ld.so.1: su: warning: su:
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA:
path name too long
ld.so.1: su: warning:
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA:
audit initialization failure: disabled
Segmentation fault


Both of segfaults are NULL pointer dereferences. The first example works on
Solaris 8, 9 and 10. Second one - only on Solaris 10. For now, it doesn't
seem to be exploitable.


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Przemyslaw Frasunek wrote:
> - SunOS 5.10 Generic i86pc i386 i86pc
> - SunOS 5.9 Generic_112233-12 sun4u

This vulnerability was introduced by one of the recent patches for Solaris 9,
possibly 112963. Ld.so patched with 112963-08 is not vulnerable -- it does
not allow LD_AUDIT for set[ug]id binaries, but upgrading to 112963-16
definitly makes ld.so exploitable.

Up-to-date Solaris 8 boxes are also vulnerable. Solaris 10 boxes are
vulnerable, both patched and unpatched.

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On Tue, Jun 28, 2005 at 06:17:02PM +0200, Przemyslaw Frasunek wrote:
> This vulnerability was introduced by one of the recent patches for Solaris 9,
> possibly 112963. Ld.so patched with 112963-08 is not vulnerable -- it does
> not allow LD_AUDIT for set[ug]id binaries, but upgrading to 112963-16
> definitly makes ld.so exploitable.

Just patchrm-ed 112963-19 to -12, it is not working anymore.

p.

--
Beware of he who would deny you access to information, for in his
heart he dreams himself your master. -- Commissioner Pravin Lal
http://nerdquiz.sgh.waw.pl/ -- polska wersja quizu dla nerdów

Vulnerability was confirmed by Sun:

http://sunsolve.sun.com/search/docum...=1-26-101794-1

There are still no patches available, but workaround was proposed.

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=20
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

I did the same. Patchrm-ed 112963-19 to -12. It still works for me.

Uname -a :

SunOS cf-node000 5.9 Generic_118558-09 sun4u sparc SUNW,Ultra-1

- --
- - Charlie
=20
5A27 58D2 C791 8769 D4A4 F316 7BF8 D1F6 4829 EDCF
=20
=20
=20

> -----Original Message-----
> From: full-disclosure-bounces@lists.grok.org.uk=20
> [mailto:full-disclosure-bounces@lists.grok.org.uk] On Behalf=20
> Of Piotr KUCHARSKI
> Sent: Tuesday, June 28, 2005 10:49 AM
> To: Przemyslaw Frasunek
> Cc: full-disclosure@lists.grok.org.uk; bugtraq@securityfocus.com
> Subject: Re: [Full-disclosure] Solaris 9/10 ld.so fun
>=20
> On Tue, Jun 28, 2005 at 06:17:02PM +0200, Przemyslaw Frasunek
> wrote:=20
> > This vulnerability was introduced by one of the recent=20
> patches for Solaris 9,
> > possibly 112963. Ld.so patched with 112963-08 is not=20
> vulnerable -- it does
> > not allow LD_AUDIT for set[ug]id binaries, but upgrading to=20
> 112963-16
> > definitly makes ld.so exploitable.
>=20
> Just patchrm-ed 112963-19 to -12, it is not working anymore.
>=20
> p.
>=20
> --=20
> Beware of he who would deny you access to information, for in his
> heart he dreams himself your master. -- Commissioner Pravin Lal
> http://nerdquiz.sgh.waw.pl/ -- polska wersja quizu dla nerd=F3w
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> Hosted and sponsored by Secunia - http://secunia.com/

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>I did the same. Patchrm-ed 112963-19 to -12. It still works for me.
>
>Uname -a :
>
>SunOS cf-node000 5.9 Generic_118558-09 sun4u sparc SUNW,Ultra-1


Please verify the md5 checksums of the resulting ld.so binaries
with the Solaris fingerprint database so you are certain exactly which
version you are using.

This is what I have on file:

a684091a9d09a44bbbbd48480cf9ea6c /usr/lib/ld.so.1 SUNWcsu;sparc;11.9.0,REV=2002.04.06.15.27;112963-12


Casper

This is a multi-part message in MIME format.
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Przemyslaw Frasunek wrote:

>Vulnerability was confirmed by Sun:
>
>http://sunsolve.sun.com/search/docum...=1-26-101794-1
>
>There are still no patches available, but workaround was proposed.
>
>
>

Here is an exploit for Schillix using venglin's mojo.
-KF


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name="Schily-Root.tar"
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