Package: zope2.11
Severity: serious
Tags: security patch
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Hi,
Two vulnerabilities have been reported in Zope, which can be exploited by
malicious people to bypass certain
security restrictions and compromise a vulnerable system.
1) A missing access control check was found in the way Zope Enterprise Objects
(ZEO) used to manage remote connections to the Zope server. A remote attacker
could use this flaw to execute arbitrary Python code in the context of
Zope server. (CVE-2009-0668)[0]
2) A weakness was found in the Zope Enterprise Objects (ZEO) authentication
protocol. A remote attacker could use this flaw to bypass the authentication
to the Zope Object Database (ZODB). (CVE-2009-0669)[1]
If you fix the vulnerabilities please also make sure to include the
CVE ids in your changelog entry.
For further information see:
[0] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0668
http://security-tracker.debian.net/tracker/CVE-2009-0668
[1] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0669
http://security-tracker.debian.net/tracker/CVE-2009-0669
http://mail.zope.org/pipermail/zope-announce/2009-August/002220.html
Cheers,
Giuseppe.
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=== StorageServer.py
==================================================================
--- StorageServer.py (revision 167632)
+++ StorageServer.py (local)
@@ -111,7 +111,7 @@
for func in self.extensions:
self._extensions[func.func_name] = None
- def finish_auth(self, authenticated):
+ def _finish_auth(self, authenticated):
if not self.auth_realm:
return 1
self.authenticated = authenticated
@@ -421,6 +421,7 @@
def new_oids(self, n=100):
"""Return a sequence of n new oids, where n defaults to 100"""
+ n = min(n, 100)
if self.read_only:
raise ReadOnlyError()
if n <= 0:
=== auth/auth_digest.py
==================================================================
--- auth/auth_digest.py (revision 167632)
+++ auth/auth_digest.py (local)
@@ -121,7 +121,7 @@
check = hexdigest("%s:%s" % (h_up, challenge))
if check == response:
self.connection.setSessionKey(session_key(h_up, self._key_nonce))
- return self.finish_auth(check == response)
+ return self._finish_auth(check == response)
extensions = [auth_get_challenge, auth_response]
=== tests/auth_plaintext.py
==================================================================
--- tests/auth_plaintext.py (revision 167632)
+++ tests/auth_plaintext.py (local)
@@ -41,7 +41,7 @@
self.connection.setSessionKey(session_key(username,
self.database.realm,
password))
- return self.finish_auth(dbpw == password_dig)
+ return self._finish_auth(dbpw == password_dig)
class PlaintextClient(Client):
extensions = ["auth"]
=== zrpc/connection.py
==================================================================
--- zrpc/connection.py (revision 167632)
+++ zrpc/connection.py (local)
@@ -24,7 +24,7 @@
import ThreadedAsync
from ZEO.zrpc import smac
from ZEO.zrpc.error import ZRPCError, DisconnectedError
-from ZEO.zrpc.marshal import Marshaller
+from ZEO.zrpc.marshal import Marshaller, ServerMarshaller
from ZEO.zrpc.trigger import trigger
from ZEO.zrpc.log import short_repr, log
from ZODB.loglevels import BLATHER, TRACE
@@ -883,6 +883,7 @@
def __init__(self, sock, addr, obj, mgr):
self.mgr = mgr
self.__super_init(sock, addr, obj, 'S')
+ self.marshal = ServerMarshaller()
self.obj.notifyConnected(self)
def handshake(self):
=== zrpc/marshal.py
==================================================================
--- zrpc/marshal.py (revision 167632)
+++ zrpc/marshal.py (local)
@@ -52,6 +52,20 @@
level=logging.ERROR)
raise
+class ServerMarshaller(Marshaller):
+
+ def decode(self, msg):
+ """Decodes msg and returns its parts"""
+ unpickler = cPickle.Unpickler(StringIO(msg))
+ unpickler.find_global = server_find_global
+
+ try:
+ return unpickler.load() # msgid, flags, name, args
+ except:
+ log("can't decode message: %s" % short_repr(msg),
+ level=logging.ERROR)
+ raise
+
_globals = globals()
_silly = ('__doc__',)
@@ -78,3 +92,21 @@
return r
raise ZRPCError("Unsafe global: %s.%s" % (module, name))
+
+def server_find_global(module, name):
+ """Helper for message unpickler"""
+ try:
+ m = __import__(module, _globals, _globals, _silly)
+ except ImportError, msg:
+ raise ZRPCError("import error %s: %s" % (module, msg))
+
+ try:
+ r = getattr(m, name)
+ except AttributeError:
+ raise ZRPCError("module %s has no global %s" % (module, name))
+
+ safe = getattr(r, '__no_side_effects__', 0)
+ if safe:
+ return r
+
+ raise ZRPCError("Unsafe global: %s.%s" % (module, name))
