bugGKSu - Bugs: bug #19563, Format string bug in gksu.c


bug #19563: Format string bug in gksu.c

Submitter:  None
Submitted:  Mon 09 Apr 2007 10:43:21 PM UTC
Category:  None Severity:  3 - Normal
Item Group:  None Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open
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Mon 09 Apr 2007 10:43:21 PM UTC, original submission:  

There is a format string bug in the function gk_dialog, in gksu.c :

149  diag_win = gtk_message_dialog_new_with_markup (NULL, GTK_DIALOG_MODAL,
151 msg);

Indeed, the 5th parameter of the call to gtk_message_dialog_new_with_markup is not sanitizied, so a buggy msg can crash gksu.
This bug can be easilly reproduced :
% gksu '%s'
[...] give 3 wrong passwords [...]
zsh: segmentation fault (core dumped)

Here is a trivial patch :
--- gksu.c      2006-09-15 04:45:04.000000000 +0200
+++ gksu.c-patched      2007-04-10 00:40:44.000000000 +0200
@@ -148,7 +148,7 @@
   diag_win = gtk_message_dialog_new_with_markup (NULL, GTK_DIALOG_MODAL,
                                                 type, GTK_BUTTONS_CLOSE,
-                                                msg);
+                                                '%s', msg);
   gtk_signal_connect_object (GTK_OBJECT(diag_win), "delete_event",



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