CVE-2015-3145.patch

From ea595c516bc936a514753597aa6c59fd6eb0765e Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Thu, 16 Apr 2015 16:37:40 +0200
Subject: [PATCH] cookie: cookie parser out of boundary memory access
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The internal libcurl function called sanitize_cookie_path() that cleans
up the path element as given to it from a remote site or when read from
a file, did not properly validate the input. If given a path that
consisted of a single double-quote, libcurl would index a newly
allocated memory area with index -1 and assign a zero to it, thus
destroying heap memory it wasn't supposed to.

CVE-2015-3145

Bug: https://curl.se/docs/adv_20150422C.html
Reported-by: Hanno Böck
---
 lib/cookie.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/lib/cookie.c b/lib/cookie.c
index 0864f6b..0127926 100644
--- a/lib/cookie.c
+++ b/lib/cookie.c
@@ -223,15 +223,18 @@ static char *sanitize_cookie_path(const char *cookie_path)
   char *new_path = strdup(cookie_path);
   if(!new_path)
     return NULL;
 
   /* some stupid site sends path attribute with '"'. */
+  len = strlen(new_path);
   if(new_path[0] == '\"') {
-    memmove((void *)new_path, (const void *)(new_path + 1), strlen(new_path));
+    memmove((void *)new_path, (const void *)(new_path + 1), len);
+    len--;
   }
-  if(new_path[strlen(new_path) - 1] == '\"') {
-    new_path[strlen(new_path) - 1] = 0x0;
+  if(len && (new_path[len - 1] == '\"')) {
+    new_path[len - 1] = 0x0;
+    len--;
   }
 
   /* RFC6265 5.2.4 The Path Attribute */
   if(new_path[0] != '/') {
     /* Let cookie-path be the default-path. */
@@ -239,12 +242,11 @@ static char *sanitize_cookie_path(const char *cookie_path)
     new_path = strdup("/");
     return new_path;
   }
 
   /* convert /hoge/ to /hoge */
-  len = strlen(new_path);
-  if(1 < len && new_path[len - 1] == '/') {
+  if(len && new_path[len - 1] == '/') {
     new_path[len - 1] = 0x0;
   }
 
   return new_path;
 }
-- 
2.1.4