full-disclosure - Re: ** FreeBSD local r00t zeroday

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Message-Id: <E98836FE-9F2F-4D02-BE84-FFC22DC1E52C@davidberard.fr>
Date: Tue, 1 Dec 2009 13:39:31 +0100
From: David Berard <contact@...idberard.fr>
To: full-disclosure@...ts.grok.org.uk
Cc: Colin Percival <cperciva@...ebsd.org>
Subject: Re: ** FreeBSD local r00t zeroday

> The patch is at
>  http://people.freebsd.org/~cperciva/rtld.patch
> 

This patch doesn't work under FreeBSD 7.x due to inexistant 
unsetenv(LD_ "ELF_HINTS_PATH"); in rtld.c


This patch seem to fix the issue on FreeBSD 7.x

--- /usr/src/libexec/rtld-elf/rtld.c	2008-11-25 03:59:29.000000000 +0100
+++ /usr/src/libexec/rtld-elf/rtld.c.new	2009-12-01 13:09:15.000000000 +0100
@@ -358,11 +358,12 @@
      * future processes to honor the potentially un-safe variables.
      */
     if (!trust) {
-        unsetenv(LD_ "PRELOAD");
-        unsetenv(LD_ "LIBMAP");
-        unsetenv(LD_ "LIBRARY_PATH");
-        unsetenv(LD_ "LIBMAP_DISABLE");
-        unsetenv(LD_ "DEBUG");
+	    if (unsetenv(LD_ "PRELOAD") || unsetenv(LD_ "LIBMAP") ||
+			    unsetenv(LD_ "LIBRARY_PATH") || unsetenv(LD_ "LIBMAP_DISABLE") ||
+			    unsetenv(LD_ "DEBUG")) {
+		    _rtld_error("environment corrupt; aborting");
+		    die();
+	    }
     }
     ld_debug = getenv(LD_ "DEBUG");
     libmap_disable = getenv(LD_ "LIBMAP_DISABLE") != NULL;

Best Regards.

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David BERARD
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