Home page logo
/

oss-sec logo oss-sec mailing list archives

Re: CVE Request -- libgssapi, libgssglue -- Ability to load untrusted configuration file, when loading GSS mechanisms and their definitions during initialization
From: Marcus Meissner <meissner () suse de>
Date: Fri, 12 Aug 2011 23:43:03 +0200

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) {


  By Date           By Thread  

Current thread:
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]