SSRT4789 rev. 0 HP-UX Apache server remote Denial of Service and bypassing access restrictions

From: Security Alert (
Date: 08/09/04

Date: Mon, 09 Aug 2004 12:31:49 GMT

Hash: SHA1



SSRT4789 rev. 0 HP-UX Apache server remote Denial of Service and
                bypassing access restrictions

 There are no restrictions for distribution of this Bulletin
 provided that it remains complete and intact.

 The information in this Security bulletin should be acted upon
 as soon as possible.

INITIAL RELEASE: 08 August 2004

POTENTIAL SECURITY IMPACT: Remote Denial of Service and bypass
                              of access restrictions.

HP Software Security Response Team

REFERENCES: CAN-2003-0987, CAN-2003-0020, CAN-2004-0174 and

A potential security vulnerability has been identified with HP-UX
running Apache where the vulnerability could be exploited remotely
to create a Denial of Service (DoS) or to bypass access

SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.
HP-UX B.11.04 with Virtualvault 4.7, Virtualvault 4.6, or
Virtualvault 4.5.

Four potential security vulnerabilities have been reported in
Apache HTTP server ( The Common
Vulnerabilities and Exposures project <>
has referenced them as the candidates CAN-2003-0987,
CAN-2003-0020, CAN-2004-0174, and CAN-2003-0993.

1. mod_digest in Apache 1.3 before 1.3.31 does not properly verify
   the nonce of a client response by using a AuthNonce secret.

2. Apache 1.3 before 1.3.30 does not filter terminal escape
   sequences from its error logs, which could make it easier for
   attackers to insert those sequences into the terminal emulators
   containing vulnerabilities related to escape sequence handling.

3. Apache 1.3 before 1.3.30, when using multiple listening sockets
   on certain platforms, allows remote attackers to cause a Denial
   of Service (blocked new connections) via a "short-lived
   connection on a rarely-accessed listening socket."

4. mod_access in Apache 1.3 before 1.3.30, when running on
   big-endian 64-bit platforms, does not properly parse Allow/Deny
   rules using IP addresses without a netmask. This could allow
   remote attackers to bypass intended access restrictions.


     Note: To determine if a system has an affected version,
           search the output of "swlist -a revision -l fileset"
           for an affected fileset. Then determine if the
           recommended patch or update is installed.

      HP-UX B.11.04 Virtualvault A.04.70
      action: install PHSS_30944 or subsequent

      action: install PHSS_31058 or subsequent

      HP-UX B.11.04 Virtualvault A.04.60
      action: install PHSS_30946 or subsequent

      action: install PHSS_31057 or subsequent

      HP-UX B.11.04 Virtualvault A.04.50
      action: install PHSS_30647 or subsequent

      action: install PHSS_30648 or subsequent

      HP-UX B.11.04 HP Webproxy A.02.10
      action: install PHSS_30950 or subsequent

      HP-UX B.11.04 HP Webproxy A.02.00
      action: install PHSS_30949 or subsequent


HP has made the following patches available:

  PHSS_30944 Virtualvault 4.7 IWS update
  PHSS_31058 Virtualvault 4.7 OWS update
  PHSS_30946 Virtualvault 4.6 IWS update
  PHSS_31057 Virtualvault 4.6 OWS update
  PHSS_30647 Virtualvault 4.5 IWS update
  PHSS_30648 Virtualvault 4.5 OWS update
  PHSS_30950 Webproxy server 2.1 update
  PHSS_30949 Webproxy server 2.0 update


Revision 0 - 5 August 2004

  Initial release

* The software product category that this Security Bulletin
  relates to is represented by the 5th and 6th characters of the
  Bulletin number: GN=General, MA=Management Agents,
  MI=Misc. 3rd party, MP=HP-MPE/iX, NS=HP NonStop Servers,
  OV=HP OpenVMS, PI=HP Printing & Imaging, ST=HP Storage,
  TU=HP Tru64 UNIX, TL=Trusted Linux, UX=HP-UX, VV=Virtual Vault

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The HP-UX Security Patch Matrix is available here:
Or via anonymous ftp:

The HP-UX Security Patch Matrix, updated daily, categorizes
security patches by platform/OS release, and by Bulletin topic.
The Security Patch Check tool completely automates the process of
reviewing the Security Patch Matrix for HP-UX 11.XX Versions.

NOTE: Installing patches listed in the Security Patch Matrix will
completely implement the RESOLUTION in the Security Bulletin
_only_ if there are no MANUAL ACTIONS included.

The Security Patch Check tool can also verify that a Security
Bulletin RESOLUTION has been implemented on HP-UX 11.XX Versions
provided that no MANUAL ACTIONS were included. The Security Patch
Check tool cannot verify patches implemented via product upgrade.

For information on the Security Patch Check tool, see:

REPORT: To report a potential security vulnerability with any HP
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System management and security procedures must be reviewed
frequently to maintain system integrity. HP is continually
reviewing and enhancing the security features of software products
to provide customers with current secure solutions.

"HP is broadly distributing this Security Bulletin in order to
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(c)Copyright 2004 Hewlett-Packard Development Company, L.P.
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Version: PGP 8.0.2


Yours truly,
HP S/W Security Team
WTEC Cupertino, California

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