[UNIX] Gtkdiskfree Insecure Temporary File Creation

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Gtkdiskfree Insecure Temporary File Creation
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SUMMARY

"gtkdiskfree - A Gnome program which shows free and used space on your
filesystems."

Improper use of temporary files allows local attackers to perform a
symbolic link attack and execute programs with elevated privileges using
gtkdiskfree.

DETAILS

Vulnerable Systems:
* gtkdiskfree version 1.9.3 and prior

gtkdiskfree creates a statically named temporary file of
'/tmp/gtkdiskfree'.

Attackers may perform a symbolic link attack and execute programs with
elevated privileges.

Vulnerable code:
src/mount.h
23 #define TUBE_NAME "/tmp/gtkdiskfree"

src/mount.c
32 open_cmd_tube (const gchar *cmd, const gchar *mount_point)
33 {
34 gint status;
35 gchar error[MAXLINE], *line;
36 FILE *sh, *tmp;
37
38 setbuf(stdout, error);
39 line = g_strconcat(cmd, " ", mount_point, " &> ", TUBE_NAME,
NULL);
40 sh = popen(line, "r");
41 g_free(line);
42
43 status = pclose(sh);
44
45 if (status == 0) {
46 remove(TUBE_NAME);
47 gui_list_main_update(GTK_TREE_VIEW(list_treeview));
48
49 return;
50 } else {
51 if ((tmp = fopen(TUBE_NAME, "r")) == NULL) {
52 gui_list_main_update(GTK_TREE_VIEW(list_treeview));
53
54 return;
55 }
56 if (fgets(error, MAXLINE-1, tmp) == NULL) {
57 fclose(tmp);
58 remove(TUBE_NAME);
59
gui_list_main_update(GTK_TREE_VIEW(list_treeview));
60
61 return;
62 }
63 fclose(tmp);
64 remove(TUBE_NAME);
65 error_window(error);
66 }
67 gui_list_main_update(GTK_TREE_VIEW(list_treeview));
68
69 return;
70 }

ADDITIONAL INFORMATION

The information has been provided by <mailto:exploits@zataz.net> ZATAZ
Audits.
The original article can be found at:
<http://www.zataz.net/adviso/gtkdiskfree-09052005.txt>
http://www.zataz.net/adviso/gtkdiskfree-09052005.txt

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