AIX 5.3 TL 11 : xntpd (IZ71610)

This script is Copyright (C) 2013-2015 Tenable Network Security, Inc.


Synopsis :

The remote AIX host is missing a security patch.

Description :

'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.'.

See also :

http://aix.software.ibm.com/aix/efixes/security/xntpd_advisory.asc

Solution :

Install the appropriate interim fix.

Risk factor :

Medium / CVSS Base Score : 6.4
(CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P)

Family: AIX Local Security Checks

Nessus Plugin ID: 63803 ()

Bugtraq ID:

CVE ID: CVE-2009-3563

Ready to Amp Up Your Nessus Experience?

Get Nessus Professional to scan unlimited IPs, run compliance checks & more

Buy Nessus Professional Now