@stake advisory: HP dced Remote Command Execution Multiple OSes

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                            @stake, Inc.
                          www.atstake.com

                         Security Advisory

Advisory Name: HP dced Remote Command Execution
Release Date: 07/22/2004
Application: dced
Platform: HPUX 11
HP Tru64
HP OpenVMS
Severity: A remote attacker can execute arbitrary commands
Authors: Jeremy Jethro [[email protected]]
Vendor Status: Vendor has patches
CVE Candidate: CAN-2004-0716
Reference: www.atstake.com/research/advisories/2004/a072204-1.txt

Overview:

A buffer overflow vulnerability was discovered in HP's implementation
of the DCE endpoint mapper (epmap) which listens by default on TCP
port 135. Successful exploitation of this vulnerability may allow
an attacker to execute arbitrary commands on the targeted system
with the privileges of the DCED process which is typically run as
the root user.

Details:

There is a buffer overflow in HP's DCED implementation that can be
triggered by specifying a small fragment length, and sending a large
amount of stub data.

A Nessus (NASL) script that can detect vulnerable DCED daemons will
be released 30 days after the publication of this advisory.

Timeline:

Vendor notified on 4/23/2004 via email to [email protected]

Vendor responded on 4/29/2004 that current patched version of
HP-UX 11 with patches noted in bulletin HPSBUX0311-299 fixed this
issue. However, vendor noted that this issue effected other dced
implementations and suggested notifying US-CERT so all
vendors may test their code.

US-CERT notified on 5/3/2004

US-CERT responded on 5/7/2004 and issued tracking number VU#259796

HP releases Tru64 security bulletin on 6/21/2004

HP releases OpenVMS security bulletin on 7/14/2004

US-CERT confirms that it knows of no other vendors that were
notified of issue VU#259796 that are vulnerable to same issue on
7/20/2004

Advisory released 7/22/2004

Vendor Response:

OS: HP HP-UX 11 (Issue fixed prior to notification from @stake)

Bulletin: HPSBUX0311-299: SSRT3660 DCE (Rev.01)

Patch: B.11.00 - PHSS_29963
B.11.11 - PHSS_29964
B.11.23 - PHSS_29966

   The patches are available on <http://itrc.hp.com>

OS: HP Tru64

Bulletin: SSRT4741 rev.0 DCE for HP Tru64 UNIX Potential RPC
Buffer Overrun Attack

Patch: http://support.entegrity.com/private/patches/dce/ssrt4741.asp

OS: HP OpenVMS

Bulletin: SSRT4741 Rev.1 DCE for HP OpenVMS Potential RPC Buffer
Overrun Attack

  HP is releasing the following patch kits to resolve this
  issue and are available from the ITRC at
  http://www2.itrc.hp.com/service/patch/mainPage.do
  Search for the patch kit name as shown.

  HP OpenVMS Alpha Version: Patch Kit name:

  HP OpenVMS Alpha V7.3-2 VMS732_RPC-V0300
  HP OpenVMS Alpha V7.3-1 VMS731_RPC-V0400
  HP OpenVMS Alpha V7.3 VMS73_RPC-V0400 

@stake Recommendation:

Disable dced if not necessary. If required install vendor patches.

Common Vulnerabilities and Exposures (CVE) Information:

The Common Vulnerabilities and Exposures (CVE) project has assigned
the following names to these issues. These are candidates for
inclusion in the CVE list (http://cve.mitre.org), which standardizes
names for security problems.

CAN-2004-0716 HP dced Remote Command Execution

@stake Vulnerability Reporting Policy:
http://www.atstake.com/research/policy/

@stake Advisory Archive:
http://www.atstake.com/research/advisories/

PGP Key:
http://www.atstake.com/research/pgp_key.asc

Copyright 2004 @stake, Inc. All rights reserved.

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