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Category:  Application (Web Server/CGI)  >  Compaq Secure Web Server Vendors:  HP (Compaq)
(HP Issues Fix for SWS) Apache Web Server Error in Processing Requests With Many Space Characters Lets Remote Users Deny Service
SecurityTracker Alert ID:  1012680
SecurityTracker URL:  http://securitytracker.com/id?1012680
CVE Reference:  CAN-2004-0942   (Links to External Site)
Date:  Dec 24 2004
Impact:  Denial of service via network
Fix Available:  Yes   Vendor Confirmed:  Yes  
Version(s): prior to 6.3.6a
Description:  A denial of service vulnerability was reported in the Apache web server. A remote user can consume excessive resources on the target system.

Chintan Trivedi reported that a remote user can submit multiple, specially crafted HTTP GET requests containing spaces to cause denial of service conditions on the target system.

The vendor later reported that the field length limit is not properly enforced for certain malicious requests.

A demonstration exploit request is provided:

GET / HTTP/1.0\n
[space] x 8000\n
[space] x 8000\n
[space] x 8000\n
.
.
8000 times

Impact:  A remote user can consume excessive resources on the target system.
Solution:  HP has issued a fixed version of the Secure Web Server (6.3.6a) for Tru64 UNIX, available at:

http://h30097.www3.hp.com/internet/download.htm

Cause:  Resource error
Underlying OS:  UNIX (Tru64)

Message History:   This archive entry is a follow-up to the message listed below.
Nov 4 2004 Apache Web Server Error in Processing Requests With Many Space Characters Lets Remote Users Deny Service



 Source Message Contents

Date:  Thu, 23 Dec 2004 02:47:37 -0500
Subject:  [none]

 
 
HP SECURITY BULLETIN
 
HPSBTU01106     REVISION: 0
 
SSRT4876 rev.0 HP Tru64 UNIX SWS (Apache) Secure Web Server Remote Denial of Service (DoS)
 
NOTICE:  
	
 
There are no restrictions for distribution of this Bulletin provided that it remains complete and int
act. The information in this Security bulletin should be acted upon as soon as possible. INITIAL RELEASE: 22 December 2004 POTENTIAL SECURITY IMPACT: Remote Denial of Service (DoS) SOURCE: HEWLETT-PACKARD COMPANY HP Software Security Response Team REFERENCES: CAN-2004-0942 VULNERABILITY SUMMARY: A potential security vulnerability has been reported in the Secure Web Server (SWS) for Tru64 UNIX (powered by Apache) software distributed with HP Internet Express for Tru64 UNIX (IX). The potential vulnerability is remotely exploitable and can cause a denial of service (DoS) due to high CPU consumption. SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed. SWS based on Apache 2.0.52 and earlier (IX 6.3 and earlier; SWS standalone versions earlier than 6.3.6a) BACKGROUND: For a PGP signed version of this bulletin please write to security-alert@hp.com For a listing of all HP Tru64 UNIX security patch kits please see the following web site: http://h30097.www3.hp.com/unix/security-download.html Until the corrections are available in a mainstream release, HP is providing a patch that resolves the potential SWS vulnerability described in this bulletin. The corrections are scheduled to be available in the following mainstream release: HP Internet Express for Tru64UNIX (IX) version 6.4 RESOLUTION: The Secure Web Server 6.3.6a for Tru64 UNIX (powered by Apache) kit is available for download at the following site: http://h30097.www3.hp.com/internet/download.htm The kit is based on a patched version of Apache 2.0.52. BULLETIN REVISION HISTORY: Revision 0 - 22 December 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 SUPPORT: For further information, contact HP Services support channel. SUBSCRIBE: To initiate a subscription to receive future HP Security Bulletins via Email: http://h30046.www3.hp.com/driverAlertProfile.php?regioncode=NA&langcode=USENG&jumpid=in_SC-GE
N__driverITRC&topiccode=ITRC On the web page: Driver and Support Alerts/Notifications Sign-up: Product Selection Under Step1: your products 1. Select product category: - a minimum of servers must be selected. 2. Select product family or search: - a minimum of one product must be selected. 3. Add a product: - a minimum of one product must be added. In Step 2: your operating system(s) - check ALL operating systems for which alerts are required. Complete the form and Save. To update an existing subscription: http://h30046.www3.hp.com/subSignIn.php Log in on the web page Subscriber's choice for Business: sign-in. On the Web page: Subscriber's Choice: your profile summary - use Edit Profile to update appropriate sections. Note: In addition to the individual alerts/notifications for the selected operating systems/products, subscribers will automatically receive one copy of alerts for non-operating system categories (i.e., a subscriber who signs up for all six operating system alerts will only receive one copy of all the non-operating system alerts). To review previously published Security Bulletins visit: http://itrc.hp.com/cki/bin/doc.pl/screen=ckiSecurityBulletin REPORT: To report a potential security vulnerability with any HP supported product, send Email to: security-alert@hp.com. It is strongly recommended that security related information being communicated to HP be encrypted using PGP, especially exploit information. To obtain the security-alert PGP key please send an e-mail message to security-alert@hp.com with the Subject of 'get key' (no quotes). 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 bring to the attention of users of the affected HP products the important security information contained in this Bulletin. HP recommends that all users determine the applicability of this information to their individual situations and take appropriate action. HP does not warrant that this information is necessarily accurate or complete for all user situations and, consequently, HP will not be responsible for any damages resulting from user's use or disregard of the information provided in this Bulletin. To the extent permitted by law, HP disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose, title and non-infringement." ©Copyright 2004 Hewlett-Packard Development Company, L.P. Hewlett-Packard Company shall not be liable for technical or editorial errors or omissions contained herein. The information provided is provided "as is" without warranty of any kind. To the extent permitted by law, neither HP nor its affiliates, subcontractors or suppliers will be liable for incidental, special or consequential damages including downtime cost; lost profits; damages relating to the procurement of substitute products or services; or damages for loss of data, or software restoration. The information in this document is subject to change without notice. Hewlett-Packard Company and the names of Hewlett-Packard products referenced herein are trademarks of Hewlett-Packard Company 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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