Issue #3924: Ignore cookies with invalid "version" field in cookielib.

Lib/cookielib.py

@@ -434,6 +434,13 @@ def join_header_words(lists):
         if attr: headers.append("; ".join(attr))
     return ", ".join(headers)
 
+def strip_quotes(text):
+    if text.startswith('"'):
+        text = text[1:]
+    if text.endswith('"'):
+        text = text[:-1]
+    return text
+
 def parse_ns_headers(ns_headers):
     """Ad-hoc parser for Netscape protocol cookie-attributes.
 
@@ -451,7 +458,7 @@ def parse_ns_headers(ns_headers):
     """
     known_attrs = ("expires", "domain", "path", "secure",
                    # RFC 2109 attrs (may turn up in Netscape cookies, too)
-                   "port", "max-age")
+                   "version", "port", "max-age")
 
     result = []
     for ns_header in ns_headers:
@@ -471,12 +478,11 @@ def parse_ns_headers(ns_headers):
                     k = lc
                 if k == "version":
                     # This is an RFC 2109 cookie.
+                    v = strip_quotes(v)
                     version_set = True
                 if k == "expires":
                     # convert expires date to seconds since epoch
-                    if v.startswith('"'): v = v[1:]
-                    if v.endswith('"'): v = v[:-1]
-                    v = http2time(v)  # None if invalid
+                    v = http2time(strip_quotes(v))  # None if invalid
             pairs.append((k, v))
 
         if pairs:
@@ -1450,7 +1456,11 @@ class CookieJar:
 
         # set the easy defaults
         version = standard.get("version", None)
-        if version is not None: version = int(version)
+        if version is not None:
+            try:
+                version = int(version)
+            except ValueError:
+                return None  # invalid version, ignore cookie
         secure = standard.get("secure", False)
         # (discard is also set if expires is Absent)
         discard = standard.get("discard", False)