[UNIX] Gtkdiskfree Insecure Temporary File Creation

From: SecuriTeam (support_at_securiteam.com)
Date: 09/15/05

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Date: 15 Sep 2005 11:54:25 +0200

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      Gtkdiskfree Insecure Temporary File Creation
    ------------------------------------------------------------------------

    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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