AIX 5.3 TL 10 : bos.net.tcp.client (U832875)

High Nessus Plugin ID 46591

Synopsis

The remote AIX host is missing a vendor-supplied security patch.

Description

The remote host is missing AIX PTF U832875, which is related to the security of the package bos.net.tcp.client.

NTP mode 7 (MODE_PRIVATE) is used by the ntpdc query and control utility. In contrast, ntpq uses NTP mode 6 (MODE_CONTROL), while routine NTP time transfers use modes 1 through 5. Upon receipt of an incorrect mode 7 request or a mode 7 error response from an address that is not listed in a 'restrict ... noquery' or 'restrict ...
ignore' segment, ntpd will reply with a mode 7 error response and log a message.

If an attacker spoofs the source address of ntpd host A in a mode 7 response packet sent to ntpd host B, both A and B will continuously send each other error responses, for as long as those packets get through.

If an attacker spoofs an address of ntpd host A in a mode 7 response packet sent to ntpd host A, then host A will respond to itself endlessly, consuming CPU and logging excessively.

Solution

Install the appropriate missing security-related fix.

See Also

http://www-01.ibm.com/support/docview.wss?uid=isg1IZ71608

Plugin Details

Severity: High

ID: 46591

File Name: aix_U832875.nasl

Version: $Revision: 1.2 $

Type: local

Published: 2010/05/19

Modified: 2013/03/14

Dependencies: 12634

Risk Information

Risk Factor: High

Vulnerability Information

CPE: cpe:/o:ibm:aix:5.3

Required KB Items: Host/local_checks_enabled, Host/AIX/oslevel, Host/AIX/version, Host/AIX/lslpp

Patch Publication Date: 2010/03/01

Vulnerability Publication Date: 2010/03/01