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From: Julien Viard de Galbert <julien@vdg.blogsite.org>
Date: Tue, 23 Nov 2010 23:29:54 +0100
Subject: Solve a symlink vulnerability
In the same spirit as previous 08_symlink_vulnerability patch for #359745
The .htaccess file creation did not test the symlink.
Index: webalizer/output.c
===================================================================
--- webalizer.orig/output.c 2010-11-24 14:34:36.000000000 +0100
+++ webalizer/output.c 2010-11-24 14:36:56.000000000 +0100
@@ -2408,6 +2408,21 @@
/* .htaccess file needed? */
if (htaccess)
{
+ struct stat out_stat;
+
+ /* stat the file */
+ if ( !(lstat(".htaccess", &out_stat)) )
+ {
+ /* check if the file a symlink */
+ if ( S_ISLNK(out_stat.st_mode) )
+ {
+ if (verbose)
+ fprintf(stderr,"%s %s (symlink)\n",msg_no_open,".htaccess");
+ return NULL;
+ }
+ }
+
+ /* open the file... */
if ((out_fp=fopen(".htaccess","wx")) != NULL)
{
fprintf(out_fp,"DirectoryIndex %s\n",index_fname);
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