[security bulletin] SSRT5957 rev.0 - HP Tru64 UNIX IPSEC Tunnel ESP Mode Remote Unauthorized Disclosure of Encrypted Data
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HP SECURITY BULLETIN
HPSBTU01217 REVISION: 0
SSRT5957 rev.0 - HP Tru64 UNIX IPSEC Tunnel ESP Mode Remote
Unauthorized Disclosure of Encrypted Data
NOTICE:
The information in this Security Bulletin should be acted upon
as soon as possible.
INITIAL RELEASE:
09 August 2005
POTENTIAL SECURITY IMPACT:
remote unauthorized disclosure of encrypted data
SOURCE:
Hewlett-Packard Company
HP Software Security Response Team
VULNERABILITY SUMMARY:
Several potential security vulnerabilities have been reported on
HP Tru64 UNIX systems using an IPsec tunnel mode configuration
which uses ESP without authentication. When running this
configuration a remote attacker could force an error such that a
portion of a plain-text message can be intercepted by the
attacker.
REFERENCES:
NISCC VU#004033 CAN-2005-0039
SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.
HP Tru64 UNIX 5.1B-3
HP Tru64 UNIX 5.1B-2/PK4
BACKGROUND:
- From the NISCC Vulnerability report VU#4033:
A vulnerability affecting IPsec was identified by the Information
Security Group (ISG) at Royal Holloway, University of London. The
ISG outlines three attacks that applies to a special case of the
usage of IPsec; this is where IPsec is configured to provide
confidentiality only with no integrity protection in tunnel mode.
Under this setup, an attacker can modify sections of the IPsec
packet and hence cause the endpoint to generate an error on
receipt of such modified packets. These errors are relay back to
the sending host via the Internet Control Message Protocol (ICMP);
because of the design of ICMP, these messages directly reveal
segments of the header and payload of the IPsec packet in
cleartext. An attacker can then intercept the ICMP messages to
retrieve the data in plaintext.
For Further details see the NISCC web site at www.unirad.co.uk
RESOLUTION:
Until the correction is available in a mainstream release patch
kit, HP is releasing the following Early Release Patch (ERP) kits.
The ERP kits use dupatch and will not install over any installed
Customer Specific Patches (CSPs) that have file intersections with
this ERP. Please contact your service provider for assistance if
the ERP installation is blocked by any of your installed CSPs.
The fixes contained in the ERP kits are scheduled to be available
in the following mainstream patch kit:
5.1B-4
Early Release Patches
The ERP delivers the following files:
/usr/lib/nls/msg/en_US.ISO8859-1/ipsec.msg
/usr/share/sysman/menu/tasks/ipsec/ipsec
/usr/share/sysman/menu/tasks/ipsec/ipsec.cb.tcl
Note: After installing this ERP, customers should run
"/usr/sbin/sysman ipsec". If there are any unsafe IPsec
connections, a warning message will be displayed.
HP Tru64 UNIX 5.1B-3
ERP Kit Name: T64KIT0026133-V51BB25-ES-20050801
General ITRC Patch Page:
http://www.itrc.hp.com/service/patch/mainPage.do
Kit Location:
http://www.itrc.hp.com/service/patch/patchDetail.do?
patchid=T64KIT0026133-V51BB25-ES-20050801
MD5 checksum:
b3b2031de3279c5243e8beee63dfe45b
HP Tru64 UNIX 5.1B-2/PK4
ERP Kit Name: T64KIT0026161-V51BB26-ES-20050804
General ITRC Patch Page:
http://www.itrc.hp.com/service/patch/mainPage.do
Kit Location:
http://www.itrc.hp.com/service/patch/patchDetail.do?
patchid=T64KIT0026161-V51BB26-ES-20050804
MD5 checksum:
6c4f367937ddc0637e4faf341aab3514
MD5 checksum:
b3b2031de3279c5243e8beee63dfe45b
BULLETIN REVISION HISTORY:
4 August 2005
Initial release
SUPPORT: For further information, contact normal HP Services
support channel.
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* The Software Product Category that this Security Bulletin
relates to is represented by the 5th and 6th characters of the
Bulletin number:
GN = HP General SW,
MA = HP Management Agents,
MI = Misc. 3rd party SW,
MP = HP MPE/iX,
NS = HP NonStop Servers,
OV = HP OpenVMS,
PI = HP Printing & Imaging,
ST = HP Storage SW,
TL = HP Trusted Linux,
TU = HP Tru64 UNIX,
UX = HP-UX,
VV = HP Virtual Vault
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
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(c)Copyright 2005 Hewlett-Packard Development Company, L.P.
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