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HP SECURITY BULLETIN
HPSBGN01041 REVISION: 0
SSRT4696 rev.0 HP ProCurve Routing Switches TCP Denial of Service (DoS)
NOTICE: 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: 18 May 2004
POTENTIAL SECURITY IMPACT: Denial of Service (DoS)
SOURCE: HEWLETT-PACKARD COMPANY HP Software Security Response Team
REFERENCES: NISCC 236929, CAN-2004-0230, TA04-111A
VULNERABILITY SUMMARY: A potential security vulnerability has been identified with HP ProCurve Routing Switches running TCP where the vulnerability could be exploited remotely to create a Denial of Service (DoS).
SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed. HP ProCurve Routing Switch 9315M, 9308M, and 9304M and all managed HP EtherTwist, HP AdvanceStack and HP ProCurve devices.
BACKGROUND: This information is applicable for the following security vulnerability alerts:
NISCC Vulnerability Advisory 236929 - Vulnerability Issues in TCP
US-CERT Technical Cyber Security Alert TA04-111A Vulnerabilities in TCP
CVE name CAN-2004-0230
The industry standard TCP specification (RFC793) has a vulnerability whereby established TCP connections can be reset by an attacker. The TCP stack that is part of the software used in managed HP EtherTwist, HP AdvanceStack and HP ProCurve devices is in conformance with this specification, and therefore contains this potential vulnerability. The TCP connections that are affected due to this situation are only those terminating on these devices, not those passing through these devices.
HP ProCurve Routing Switch 9315M, 9308M, and 9304M which have BGP functionality can experience a Denial of Service, the duration of which would be the time needed by the device to rebuild routing tables.
TCP sessions, including Telnet, SSH, SFTP and HTTP on all managed HP EtherTwist, HP AdvanceStack and HP ProCurve devices may be disconnected without warning. TCP sessions that have been disconnected can be re-established.
RESOLUTION: For the HP ProCurve Routing Switch 9315M, 9308M, and 9304M, the BGP technology can be protected by using the MD5 hash protection feature. HP recommends that our BGP customers implement MD5 protection as soon as possible to protect their connections against this type of attack.
Other managed HP EtherTwist, HP AdvanceStack and HP ProCurve devices are generally not impacted as TCP sessions that were disconnected can be re-established.
As a good practice, HP recommends the appropriate inactivity timeout feature on the device for each type of TCP session be implemented. TCP sessions include Telnet, SSH, SFTP and HTTP.
SUPPORT: For further information, contact HP Services support channel.
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REPORT: To report a potential security vulnerability with any HP supported product, send Email to: firstname.lastname@example.org. 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 email@example.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."
(c)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 or 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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