s3 swat: Fix possible XSS attack (bug #8289)

Nobuhiro Tsuji of NTT DATA SECURITY CORPORATION reported a possible XSS attack
against SWAT, the Samba Web Administration Tool. The attack uses reflection to
insert arbitrary content into the "change password" page.

This patch fixes the reflection issue by not printing user-specified content on
the website anymore.

Signed-off-by: Kai Blin <kai@samba.org>
(cherry picked from commit 05fa09be5a801baa5d35014e2f54b46c1ff5466b)

diff --git a/source3/web/swat.c b/source3/web/swat.c
index 67410824c125bc3780ee79b351365f26a51c6794..765655ccbc580ca95218fe3d994641a71e4160f9 100644 (file)
--- a/source3/web/swat.c
+++ b/source3/web/swat.c
@@ -1121,11 +1121,9 @@ static void chg_passwd(void)
        if(cgi_variable(CHG_S_PASSWD_FLAG)) {
                printf("<p>");
                if (rslt == True) {
-                       printf(_(" The passwd for '%s' has been changed."), cgi_variable_nonull(SWAT_USER));
-                       printf("\n");
+                       printf("%s\n", _(" The passwd has been changed."));
                } else {
-                       printf(_(" The passwd for '%s' has NOT been changed."), cgi_variable_nonull(SWAT_USER));
-                       printf("\n");
+                       printf("%s\n", _(" The passwd for has NOT been changed."));
                }
        }
        
@@ -1139,14 +1137,6 @@ static void passwd_page(void)
 {
        const char *new_name = cgi_user_name();
 
-       /* 
-        * After the first time through here be nice. If the user
-        * changed the User box text to another users name, remember it.
-        */
-       if (cgi_variable(SWAT_USER)) {
-               new_name = cgi_variable_nonull(SWAT_USER);
-       } 
-
        if (!new_name) new_name = "";
 
        printf("<H2>%s</H2>\n", _("Server Password Management"));