cookies: reject incoming cookies set for TLDs

Test 61 was modified to verify this.

CVE-2014-3620

Reported-by: Tim Ruehsen
URL: http://curl.haxx.se/docs/adv_20140910B.html

lib/cookie.c

@@ -463,6 +463,7 @@ Curl_cookie_add(struct SessionHandle *data,
         }
         else if(Curl_raw_equal("domain", name)) {
           bool is_ip;
+          const char *dotp;
 
           /* Now, we make sure that our host is within the given domain,
              or the given domain is not valid and thus cannot be set. */
@@ -472,6 +473,11 @@ Curl_cookie_add(struct SessionHandle *data,
 
           is_ip = isip(domain ? domain : whatptr);
 
+          /* check for more dots */
+          dotp = strchr(whatptr, '.');
+          if(!dotp)
+            domain=":";
+
           if(!domain
              || (is_ip && !strcmp(whatptr, domain))
              || (!is_ip && tailmatch(whatptr, domain))) {

tests/data/test61

@@ -23,6 +23,7 @@ Set-Cookie: test3=maybe; domain=foo.com; path=/moo; secure
 Set-Cookie: test4=no; domain=nope.foo.com; path=/moo; secure
 Set-Cookie: test5=name; domain=anything.com; path=/ ; secure
 Set-Cookie: fake=fooledyou; domain=..com; path=/;
+Set-Cookie: supercookie=fooledyou; domain=.com; path=/;^M
 Content-Length: 4
 
 boo