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HPSBUX03437 SSRT110025 rev.1 - HP-UX IPFilter, Remote Denial of Service (DoS)


Document ID: c04974114

Version: 1

HPSBUX03437 SSRT110025 rev.1 - HP-UX IPFilter, Remote Denial of Service (DoS)
NOTICE: The information in this Security Bulletin should be acted upon as soon as possible.

Release Date: 2016-02-16

Last Updated: 2016-02-16

Potential Security Impact: Remote Denial of Service (DoS)

Source: Hewlett Packard Enterprise, HPE Product Security Response Team


A potential security vulnerability has been identified with HP-UX running HP-UX IPFilter. The vulnerability could be remotely exploited to cause a denial of service (DoS).

Note: The vulnerability only exists when HP-UX IPFilter rules are configured for UDP protocol packets and the “keep state” option is used in that IPFilter rule.

  • PSRT110025
  • CVE-2016-1987

SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.

HP-UX IPFilter A.


CVSS 2.0 Base Metrics
Base Vector
Base Score
Information on CVSS is documented in HP Customer Notice: HPSN-2008-002


HPE has made the following mitigation information available to resolve the vulnerability for version A. of HP-UX IPFilter.

This vulnerability can be mitigated by either of the following actions:

A. Remove the “keep state” option from udp rules

  • Search for rules with “proto udp” and “keep state” to identify the impacted rule and remove the “keep state” option.

  • Example rules are as follows:
    pass in quick on lanN proto udp from <IP-addr1> to <IP-addr2> keep state
    pass out quick on lanN proto udp from <IP-addr3> to <IP-addr4> keep state

  • For the above example rules, remove the “keep state” from the rule as follows:
    pass in quick on lanN proto udp from <IP-addr1> to <IP-addr2>
    pass out quick on lanN proto udp from <IP-addr3> to <IP-addr4>

B. Alternatively, HP-UX IPFilter can be downgraded to version A.

Version:1 (rev.1) - 16 February 2016 Initial release

Third Party Security Patches: Third party security patches that are to be installed on systems running Hewlett Packard Enterprise (HPE) software products should be applied in accordance with the customer's patch management policy.

Support: For issues about implementing the recommendations of this Security Bulletin, contact normal HPE Services support channel. For other issues about the content of this Security Bulletin, send e-mail to

Report: To report a potential security vulnerability with any HPE supported product, send Email to:

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Security Bulletin Archive: A list of recently released Security Bulletins is available here:

Software Product Category: The Software Product Category is represented in the title by the two characters following HPSB.

3C = 3COM
3P = 3rd Party Software
GN = HP General Software
HF = HP Hardware and Firmware
MU = Multi-Platform Software
NS = NonStop Servers
OV = OpenVMS
PV = ProCurve
ST = Storage Software

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Document title: HPSBUX03437 SSRT110025 rev.1 - HP-UX IPFilter, Remote Denial of Service (DoS)
Document ID: emr_na-c04974114-1
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