Date: 02 July 2002
References:
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AUSCERT External Security Bulletin Redistribution
ESB-2002.323 -- Compaq Security Advisory (SSRT2253)
Secure Web Server for HP Tru64 UNIX & HP OpenVMS Potential Apache
Web Server Chunk Handling Vulnerability
2 July 2002
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AusCERT Security Bulletin Summary
---------------------------------
Product: HP Tru64 UNIX CSWS V5.8.1 and earlier
Internet Express V5.9 CSWS
Internet Express EAK V2.0
HP OpenVMS CSWS 1.0-1
HP OpenVMS CSWS 1.1-1
HP OpenVMS CSWS 1.2
Vendor: Compaq
Operating System: Tru64 UNIX
OpenVMS
Impact: Execute Arbitrary Code/Commands
Denial of Service
Access Required: Remote
Ref: AA-2002.04
AL-2002.06
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SECURITY BULLETIN SSRT2253 REVISION: 1
SSRT2253- Secure Web Server for HP Tru64 UNIX & HP OpenVMS Potential
Apache Web Server Chunk Handling Vulnerability
NOTICE: There are no restrictions for distribution of this Bulletin
provided that it remains complete and intact.
RELEASE DATE: 30 June 2002
SEVERITY: 1
SOURCE: Compaq Computer Corporation, a wholly-owned subsidiary of
Hewlett-Packard Company and
Hewlett-Packard Company HP Services
Software Security Response Team
REFERENCE: CAN-2002-0392, CERT CA-2002-17
PROBLEM SUMMARY:
Compaq was recently notified of a potential vulnerability that impact
Compaq's Secure Web Server (CSWS) for HP Tru64 UNIX and HP OpenVMS
where under certain circumstances, system integrity may be
compromised.
SSRT2253 Apache chunk handling vulnerability (severity HIGH)
Impact: local and remote
Code for handling invalid requests which use chunked encoding
may allow arbitrary code execution and or create a denial of
service.
o Buffer overflow attacks are commonly used to attempt to
subvert the function of a privileged program and possibly
execute commands at the elevated privileges if the program
file has the setuid privilege.
o DoS attacks make computer systems inaccessible by flooding a
service, server or network with useless traffic.
VERSIONS IMPACTED:
o HP Tru64 UNIX CSWS V5.8.1 and earlier
o Internet Express V5.9 CSWS & Internet Express EAK V2.0
o CSWS for HP OpenVMS
HP OpenVMS CSWS 1.0-1
HP OpenVMS CSWS 1.1-1
HP OpenVMS CSWS 1.2
*NOTE: This reported potential vulnerability does not have an
impact to the base operating system in the form of elevated
permissions or privileges.
o HP9000 Servers running HP-UX release 11.00, or 11.11
Please refer to the HP Security Bulletin HPSBUX0207-197,
available on http://itrc.hp.com in the Support Digests,
under Archives.
NO IMPACT:
o HP NonStop Servers
o HP Insight Management Software Web Products
RESOLUTION:
o HP Tru64 UNIX for V5.0a or later:
A Compaq Secure Web Server security update kit is available for
download at:
http://tru64unix.compaq.com/internet/download.htm#sws_v591
select and install the CSWS (Compaq Secure Web Server) kit V5.9.1
Installed Version Install Updated Server Kit
CSWS V5.8.2 and earlier CSWS V5.9.1
o HP Tru64 UNIX INTERNET EXPRESS V5.9
- SECURE WEB SERVER: Internet Express for HP Tru64 also contains
the Secure Web Server. All versions of Internet Express up to and
including version 5.9 are affected if the IAEAPCH* subset is
installed. Internet Express V5.9 is currently in manufacturing
and is scheduled to begin shipping. For all versions of
Internet Express, obtain the Secure Web Server for HP Tru64 from
the download site and only install the IAEAPCH591 subset
(the Secure Web Server subset).
Note: When installing Internet Express version 5.9, the IAEAPCH591
subset will need to be uninstalled, and then reinstalled after the
installation of the desired Internet Express subsets (this is
mandated by version checking in many of the web related subsets).
- Apache 2.0 Early Adopters Kit (2.0.39 beta): All versions are
affected prior to version 5.0 (Apache 2.0.39). The latest version
of the EAK may be downloaded from:
http://www.tru64unix.compaq.com/internet/download.htm
o CSWS for OpenVMS V7.1-2 or later:
A Compaq Secure Web Server security update kit is available for
download at:
www.openvms.compaq.com/openvms/products/ips/apache/csws_patches.html
Installed Version Update Kit
CSWS V1.2 CSWS12_UPDATE V3.0
CSWS V1.1-1 CSWS111_UPDATE V2.0
CSWS V1.0-1 CSWS101_UPDATE V2.0
After completing the update, Compaq strongly recommends that you
perform an immediate backup of your system disk so that any
subsequent restore operations begin with updated software.
Otherwise, you must reapply the patch after a future restore
operation.
Also, if at some future time you upgrade your system to a later
patch version, you may need to reapply the appropriate patch.
SUPPORT: For further information, contact HP Services.
SUBSCRIBE:
To subscribe to automatically receive future Security Advisories
from the Software Security Response Team via electronic mail:
http://www.support.compaq.com/patches/mailing-list.shtml
REPORT:
To report a potential security vulnerability with any Compaq
supported product, send email to: mailto:security-ssrt@compaq.com
or mailto:security-alert@hp.com
HP and Compaq appreciate your cooperation and patience. As always,
HP and Compaq urge you to periodically review your system management
and security procedures. HP and Compaq will continue to review and
enhance the security features of its products and work with our
customers to maintain and improve the security and integrity of
their systems.
"HP and Compaq are broadly distributing this Security Bulletin in
order to bring to the attention of users of the affected Compaq
products the important security information contained in this
Bulletin. HP and Compaq recommend that all users determine the
applicability of this information to their individual situations
and take appropriate action. Neither HP nor Compaq warrant that
this information is necessarily accurate or complete
for all user situations and, consequently, neither HP nor Compaq
will be responsible for any damages resulting from user's use
or disregard of the information provided in this Bulletin."
Copyright 2002 Compaq Information Technologies Group, L.P.
Compaq shall not be liable for technical or editorial errors or
omissions contained herein. The information in this document is
subject to change without notice. Compaq and the names of Compaq
products referenced herein are trademarks of Compaq Information
Technologies Group, L.P. in the United States and other countries.
Other product and company names mentioned herein may be trademarks
of their respective owners.
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