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Message-ID: <20110812214302.GA28654@suse.de>
Date: Fri, 12 Aug 2011 23:43:03 +0200
From: Marcus Meissner <meissner@...e.de>
To: oss-security@...ts.openwall.com
Subject: Re: CVE Request -- libgssapi, libgssglue -- Ability to load untrusted configuration file, when loading GSS mechanisms and their definitions during initialization
On Fri, Aug 12, 2011 at 09:37:19PM +0200, Tomas Hoger wrote:
> On Mon, 25 Jul 2011 08:57:10 +0200 Sebastian Krahmer wrote:
>
> > On Fri, Jul 22, 2011 at 03:56:22PM -0400, Josh Bressers wrote:
> > > I presume this only needs one ID
> > >
> > > Use CVE-2011-2709
> >
> > You probably speak about:
> >
> > http://www.suse.de/~krahmer/libs-vs-fscaps/
>
> I believe Josh was referring to libgssapi and libgssglue mentioned in
> the subject. It's the same code in both, libgssglue is libgssapi
> renamed.
>
> Would you mind sharing the patch you used in SLE packages? It does not
> seem to have been fixed in OpenSUSE yet. Thanks!
I just did a basic uid check.
Index: libgssglue-0.1/src/g_initialize.c
===================================================================
--- libgssglue-0.1.orig/src/g_initialize.c
+++ libgssglue-0.1/src/g_initialize.c
@@ -34,6 +34,8 @@
#include <ctype.h>
#include <errno.h>
#include <syslog.h>
+#include <unistd.h>
+#include <sys/types.h>
#ifdef USE_SOLARIS_SHARED_LIBRARIES
#include <dlfcn.h>
@@ -195,7 +197,8 @@ static void solaris_initialize ()
void *dl;
gss_mechanism (*sym)(void), mech;
- if ((filename = getenv("GSSAPI_MECH_CONF")) == NULL)
+ if ((getuid() != geteuid()) ||
+ (filename = getenv("GSSAPI_MECH_CONF")) == NULL)
filename = MECH_CONF;
if ((conffile = fopen(filename, "r")) == NULL) {
@@ -270,7 +273,8 @@ static void linux_initialize ()
void *dl;
gss_mechanism (*sym)(void), mech;
- if ((filename = getenv("GSSAPI_MECH_CONF")) == NULL)
+ if ((getuid() != geteuid()) ||
+ (filename = getenv("GSSAPI_MECH_CONF")) == NULL)
filename = MECH_CONF;
if ((conffile = fopen(filename, "r")) == NULL) {
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