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TUCoPS :: Unix :: General :: bt883.txt

Ecartis 1.0 multiple vulnerabilities





Ecartis is a modular mailing list manager, previously called Listar.

I reported these in Ecartis' bug database sometimes in May. Remembered it
again in June and sent a reminder mail to ecartis-dev list. Remembered it
again today and looks like nothing is still done. Just so it won't get
completely forgotten, here's the what I found:

Buffer overflows
----------------

Several. I fixed what I found, included patch below (compiles, not tested).
There might be more, these are the ones I found in a few minutes.

liscript problems
-----------------

Ecartis contains liscript that supports some variables and functions. User
input is fully trusted in several places which allows calling those
functions or viewing variables.

For example send mail to ecartis@host.com:

subscribe secret-list
subscribe <$post-password>

First command fails, but it selects the secret-list as active list. Second
command of course fails, but the reply mail expands the post-password to the
real password.

This is a bigger job to fix and not that critical, so no patch from me.

tar
---

This is completely unrelated to Ecartis, but the timing is good enough to
mention this here and get it a bit publicity, hopefully positive :) I was
just thinking that automated pgp-signature checking in tars would be nice.
http://mail.gnu.org/archive/html/bug-tar/2003-08/msg00013.html

patch
-----

diff -ru ecartis-1.0.0-old/src/smtp.c ecartis-1.0.0/src/smtp.c
--- ecartis-1.0.0-old/src/smtp.c	Fri Apr 18 09:45:04 2003
+++ ecartis-1.0.0/src/smtp.c	Thu Aug 14 17:30:24 2003
@@ -330,18 +330,19 @@
    return 1;
 }
 
-void smtp_body_822bis(const char *src, char *dest)
+void smtp_body_822bis(const char *src, char *dest, size_t size)
 {
     const char *ptr1;
-    char *ptr2;
+    char *ptr2, *end;
     int lastcr;
 
     lastcr = 0;
 
     ptr1 = src;
     ptr2 = dest;
+    end = dest + size - 2;
 
-    while(*ptr1) {
+    while(*ptr1 && ptr2 < end) {
        if ((*ptr1 == '\n') && (!lastcr)) {
           *ptr2++ = '\r';
        } else if (*ptr1 == '\r') {
@@ -367,7 +368,7 @@
 {
     char buffer[HUGE_BUF];
 
-    smtp_body_822bis(line,&buffer[0]);
+    smtp_body_822bis(line,&buffer[0], sizeof(buffer));
 
     clean_var("smtp-last-error", VAR_TEMP);
     if (!sock_printf(my_socket,"%s",buffer)) {
@@ -385,7 +386,7 @@
 
     buffer_printf(buffer2, sizeof(buffer2) - 1, "%s\r\n", line);
 
-    smtp_body_822bis(buffer2,&buffer[0]);
+    smtp_body_822bis(buffer2,&buffer[0], sizeof(buffer));
 
     clean_var("smtp-last-error", VAR_TEMP);
     if (!sock_printf(my_socket,"%s",buffer)) {
diff -ru ecartis-1.0.0-old/src/unhtml.c ecartis-1.0.0/src/unhtml.c
--- ecartis-1.0.0-old/src/unhtml.c	Fri Apr 18 09:45:04 2003
+++ ecartis-1.0.0/src/unhtml.c	Thu Aug 14 17:43:03 2003
@@ -161,6 +161,25 @@
         case HTMLPARSE_NORMAL:
         case HTMLPARSE_EATTAG:
           { 
+             /* Wordwrap */
+             if (linechars > 76) {
+                char tempbuf[1024];
+                *tptr = 0;
+                
+                tptr = strrchr(linebuffer,' ');
+                if (!tptr) tptr = strrchr(linebuffer,'-');
+                if (!tptr) tptr = &tempbuf[76];
+
+                buffer_printf(tempbuf,1023,"%s",
+                  (*tptr == ' ') ? tptr + 1 : tptr);
+                *tptr = 0;
+
+                newline(outfile,&linebuffer[0],indent,linemode);
+                buffer_printf(linebuffer,79,"%s",tempbuf);
+                tptr = &linebuffer[strlen(linebuffer)];
+                linechars = strlen(linebuffer);
+                lastspace = 1;
+             }
              if (tempchar == '&') {
                 memset(buffer, 0, sizeof(buffer));
                 tagptr = &buffer[0];
@@ -182,25 +201,6 @@
                    lastspace = (tempchar == ' ');
                 }
 
-                /* Wordwrap */
-                if (linechars > 76) {
-                   char tempbuf[1024];
-                   *tptr = 0;
-                   
-                   tptr = strrchr(linebuffer,' ');
-                   if (!tptr) tptr = strrchr(linebuffer,'-');
-                   if (!tptr) tptr = &tempbuf[76];
-
-                   buffer_printf(tempbuf,1023,"%s",
-                     (*tptr == ' ') ? tptr + 1 : tptr);
-                   *tptr = 0;
-
-                   newline(outfile,&linebuffer[0],indent,linemode);
-                   buffer_printf(linebuffer,79,"%s",tempbuf);
-                   tptr = &linebuffer[strlen(linebuffer)];
-                   linechars = strlen(linebuffer);
-                   lastspace = 1;
-                }
              }
           }
           break;
@@ -338,7 +338,8 @@
                 }
                 parsemode = HTMLPARSE_NORMAL;
              } else {
-               *tagptr++ = tempchar;
+               if (tagptr < buffer + sizeof(buffer) - 1)
+                 *tagptr++ = tempchar;
              }
           }
           break;
diff -ru ecartis-1.0.0-old/src/unmime.c ecartis-1.0.0/src/unmime.c
--- ecartis-1.0.0-old/src/unmime.c	Fri Apr 18 09:45:04 2003
+++ ecartis-1.0.0/src/unmime.c	Thu Aug 14 17:22:36 2003
@@ -98,7 +98,7 @@
 
       tptr2 = &temp2[0];
 
-      while (*tptr && (*tptr != '=')) {
+      while (*tptr && (*tptr != '=') && tptr2 < temp2 + sizeof(temp2) - 1) {
          if (!isspace((int)*tptr)) *tptr2++ = *tptr;
          tptr++;
       }
@@ -116,7 +116,7 @@
 
          tptr2 = &temp2[0];
 
-         while (*tptr && (*tptr != ';')) {
+         while (*tptr && (*tptr != ';') && tptr2 < temp2 + sizeof(temp2) - 1) {
             if ( (!escape) && isspace((int)*tptr) ) {
                if (!eattrail) {
                   /* We store the position to remove end spaces */


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