February 2005

ID: 00133
Ref: 116/2005
Date: 14 February 2005:15:29:52
Version: 1

---

Title: Two iDEFENSE Security Advisories: 1. ZoneAlarm 5.1 Invalid Pointer Dereference Vulnerability 2. BrightStor ARCserve Backup v11 Discovery Service Remote Buffer Overflow Vulnerability
Abstract:
Vendors affected: iDEFENSE
Operating systems affected: iDEFENSE
Applications affected: iDEFENSE

---

Title
=====

Two iDEFENSE Security Advisories:

1. ZoneAlarm 5.1 Invalid Pointer Dereference Vulnerability

2. BrightStor ARCserve Backup v11 Discovery Service
Remote Buffer Overflow Vulnerability

Detail
======

1. Local exploitation of an invalid pointer dereference vulnerability in Zone
Labs LLC's ZoneAlarm personal firewall allows attackers to trigger a denial
of service (DoS) condition.

2. Remote exploitation of a buffer overflow vulnerability in Computer
Associates International Inc's BrightStor ARCserve Backup v11 Discovery
Service may allow execution of arbitrary code.


1.



- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

===========================================================================


ESB-2005.0148 -- iDEFENSE Security Advisory 02.11.05
ZoneAlarm 5.1 Invalid Pointer Dereference Vulnerability
14 February 2005

===========================================================================



Product: ZoneAlarm 5.1
Publisher: iDEFENSE
Operating System: Windows
Impact: Denial of Service
Access: Console/Physical
CVE Names: CAN-2005-0114

Original Bulletin: http://www.idefense.com/application/poi/display?id=199

- - --------------------------BEGIN INCLUDED TEXT--------------------

ZoneAlarm 5.1 Invalid Pointer Dereference Vulnerability

iDEFENSE Security Advisory 02.11.05
www.idefense.com/application/poi/display?id=199&type=vulnerabilities
February 11, 2005

I. BACKGROUND

Zone Labs ZoneAlarm provides personal firewall protection. More information
is available from:

http://www.zonelabs.com/

II. DESCRIPTION

Local exploitation of an invalid pointer dereference vulnerability in Zone
Labs LLC's ZoneAlarm personal firewall allows attackers to trigger a denial
of service (DoS) condition.

ZoneAlarm offers process specific protection by hooking the kernel API
routine NtConnectPort(). NtConnectPort() is used by programs to implement
advanced inter-process communication (IPC). The
NtConnectPort() function is declared as follows:

NtConnectPort(
OUT PHANDLE ClientPortHandle,
IN PUNICODE_STRING ServerPortName,
IN PSECURITY_QUALITY_OF_SERVICE SecurityQos,
IN OUT PLPC_SECTION_OWNER_MEMORY ClientSharedMemory OPTIONAL,
OUT PLPC_SECTION_MEMORY ServerSharedMemory OPTIONAL,
OUT PULONG MaximumMessageLength OPTIONAL,
IN OUT PVOID ConnectionInfo OPTIONAL,
IN OUT PULONG ConnectionInfoLength OPTIONAL);

The problem specifically exists within vsdatant.sys as ZoneAlarm fails to
verify the second argument. 'ServerPortName' is a valid address prior to
derefencing it as a pointer. The vulnerable section of code is displayed here:

0001EE93 mov esi, [esp+108h+ServerPortName]
0001EE9A mov edi, eax
0001EE9C test esi, esi
0001EE9E jz short loc_1EEB6
0001EEA0 mov edx, [esi+4]

The argument 'ServerPortName' is stored in the register ESI. A check is made
to ensure that the value is not NULL. If that check is passed, the value is
dereferenced as a pointer. Any non-zero invalid memory address can be passed
as the second argument to NtConnectPort(), resulting in a system crash.

III. ANALYSIS

Exploitation allows local and remote attackers who have exploited another
vulnerability to trigger a DoS in kernel space, resulting in a "blue screen of death."

IV. DETECTION

iDEFENSE has confirmed the existence of this vulnerability in ZoneAlarm version 5.1.
It is suspected that previous versions of ZoneAlarm are vulnerable as well.

V. WORKAROUND

iDEFENSE is currently unaware of any workarounds for this issue.

VI. VENDOR RESPONSE

A vendor advisory for this issue is available at:

http://download.zonelabs.com/bin/free/securityAlert/19.html

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the names
CAN-2005-0114 to these issues. This is a candidate for inclusion in the CVE list
(http://cve.mitre.org), which standardizes names for security problems.

VIII. DISCLOSURE TIMELINE

01/06/2005 Initial vendor notification
01/07/2005 Initial vendor response
02/11/2005 Coordinated public disclosure

IX. CREDIT

iDEFENSE Labs is credited with this discovery.

Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp

X. LEGAL NOTICES

Copyright (c) 2005 iDEFENSE, Inc.

Permission is granted for the redistribution of this alert electronically.
It may not be edited in any way without the express written consent of iDEFENSE.
If you wish to reprint the whole or any part of this alert in any other medium
other than electronically, please email customerservice@idefense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate at the
time of publishing based on currently available information. Use of the
information constitutes acceptance for use in an AS IS condition.

There are no warranties with regard to this information. Neither the author
nor the publisher accepts any liability for any direct, indirect, or
consequential loss or damage arising from use of, or reliance on, this information.

- - --------------------------END INCLUDED TEXT--------------------

iQCVAwUBQg/7Cih9+71yA2DNAQK2iwP+NmwTaVnvo3R07jzhknq8VaxRIqVOo30u
PFKuIwnuHc5RHLo609lEmxIdN+1EG5dZFF03PQOMbuQ0kcNOSyuwDXjsw/ugwaRU
NQhuTmDIFihxNz2ZPLoRC+zVOvCOM4SL/eIX+EV7w2UGaa3YMdJ/awSc+gb6rb5u
flnlD10uEdQ=
=4WkQ
- -----END PGP SIGNATURE-----


2.


Computer Associates BrightStor ARCserve Backup v11 Discovery Service
Remote Buffer Overflow Vulnerability

iDEFENSE Security Advisory 02.09.05
www.idefense.com/application/poi/display?id=194&type=vulnerabilities
February 09, 2005

I. BACKGROUND

BrightStor ARCserve Backup for Windows delivers backup and restore
protection for all Windows server systems as well as Windows, Linux,
Mac OS X and UNIX client environments.

http://www3.ca.com/Solutions/ProductFamily.asp?ID=115

II. DESCRIPTION

Remote exploitation of a buffer overflow vulnerability in Computer
Associates International Inc's BrightStor ARCserve Backup v11 Discovery
Service may allow execution of arbitrary code.

The BrightStor software will automatically detect other BrightStor
(ARCserve) servers on the local network. It does this by sending UDP
probe messages to the broadcast address on the network. Each system
running the BrightStor software listens for these probes and replies
back to IP address embedded in the data of the packet. The Discovery
service listens on UDP port 41524 for these probe requests.

III. ANALYSIS

When a UDP probe is received by the Discovery Service, a stack overflow
can occur if the data is larger than the temporary buffer. The
recvfrom() call made by the service accepts up to 4096 bytes, however
the buffer it is copied to is slightly less than 1000 bytes. The return
address can be overwritten by sending a message that is at least 967
bytes long. As the service runs as 'Local System', exploitation of this
vulnerability allows running arbitrary code with superuser privileges.

IV. DETECTION

Computer Associates BrightStor ARCserve Backup v11 (Win32) has been
confirmed vulnerable.

V. WORKAROUND

Employ firewalls, access control lists or other TCP/UDP restriction
mechanism to limit access to systems and services.

VI. VENDOR RESPONSE

http://supportconnectw.ca.com/public/enews/BrightStor/brigcurrent.asp

The following vendor patches have been made available:

BrightStor ARCserve Backup r11.1 for Windows - All Languages - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6276
9

BrightStor ARCserve Backup r11.0 for Windows - All Languages - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6276
8

BrightStor Enterprise Backup v10.5 for Windows - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6277
0

BrightStor Enterprise Backup v10.0 for Windows - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6277
1

BrightStor ARCserve Backup v9.01 for Windows - All Languages - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6276
7

BrightStor ARCserve 2000 Backup for Windows (Japanese Only) - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6276
6

BrightStor ARCserve Backup r11.1 for NetWare http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6293
6

BrightStor ARCserve Backup v9 for NetWare http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6277
2

BrightStor ARCserve Backup r11.1 for Windows - 64 Bit Edition - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6299
0

BrightStor ARCserve Backup r11.0 for Windows - 64 Bit Edition - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6298
9

BrightStor Enterprise Backup v10.5 for Windows - 64 Bit Edition - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6299
1

BrightStor ARCserve Backup v9.01 for Windows - 64 Bit Edition - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6298
7

VII. CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.

VIII. DISCLOSURE TIMELINE

11/12/2004 Initial vendor notification
11/15/2004 Initial vendor response
02/09/2005 Public disclosure

IX. CREDIT

This vulnerability was discovered independently by two contributors,
one of whom is Patrik Karlsson. The other wishes to remain anonymous.

Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp

X. LEGAL NOTICES

Copyright (c) 2005 iDEFENSE, Inc.

Permission is granted for the redistribution of this alert electronically.
It may not be edited in any way without the express written consent of
iDEFENSE. If you wish to reprint the whole or any part of this alert in
any other medium other than electronically, please email
customerservice@idefense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information.
Use of the information constitutes acceptance for use in an AS IS
condition. There are no warranties with regard to this information.
Neither the author nor the publisher accepts any liability for any
direct, indirect, or consequential loss or damage arising from use of,
or reliance on, this information.