AIX 5.3 TL 11 : xntpd (IZ71610)

Medium Nessus Plugin ID 63803


The remote AIX host is missing a security patch.


'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.'.


Install the appropriate interim fix.

See Also

Plugin Details

Severity: Medium

ID: 63803

File Name: aix_IZ71610.nasl

Version: 1.4

Type: local

Published: 2013/01/24

Updated: 2019/09/16

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P

Vulnerability Information

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

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

Patch Publication Date: 2010/03/02

Vulnerability Publication Date: 2010/03/02

Reference Information

CVE: CVE-2009-3563

CERT: 568372