CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:P/A:P
EPSS
Percentile
99.7%
βNTP 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 βrestrict β¦ noqueryβ or βrestrict β¦
ignoreβ segment, ntpd will reply with a mode 7 error response and log a message.β
βIf 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.β
βIf 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.β.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The text in the description was extracted from AIX Security
# Advisory xntpd_advisory.asc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(63804);
script_version("1.6");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/04/21");
script_cve_id("CVE-2009-3563");
script_xref(name:"CERT", value:"568372");
script_name(english:"AIX 6.1 TL 1 : xntpd (IZ71611)");
script_summary(english:"Check for APAR IZ71611");
script_set_attribute(
attribute:"synopsis",
value:"The remote AIX host is missing a security patch."
);
script_set_attribute(
attribute:"description",
value:
"'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.'."
);
script_set_attribute(
attribute:"see_also",
value:"https://aix.software.ibm.com/aix/efixes/security/xntpd_advisory.asc"
);
script_set_attribute(
attribute:"solution",
value:"Install the appropriate interim fix."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:ibm:aix:6.1");
script_set_attribute(attribute:"vuln_publication_date", value:"2010/03/02");
script_set_attribute(attribute:"patch_publication_date", value:"2010/03/02");
script_set_attribute(attribute:"plugin_publication_date", value:"2013/01/24");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2013-2023 Tenable Network Security, Inc.");
script_family(english:"AIX Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/AIX/lslpp", "Host/local_checks_enabled", "Host/AIX/version");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("aix.inc");
include("misc_func.inc");
if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if ( ! get_kb_item("Host/AIX/version") ) audit(AUDIT_OS_NOT, "AIX");
if ( ! get_kb_item("Host/AIX/lslpp") ) audit(AUDIT_PACKAGE_LIST_MISSING);
if ( get_kb_item("Host/AIX/emgr_failure" ) ) exit(0, "This iFix check is disabled because : "+get_kb_item("Host/AIX/emgr_failure") );
flag = 0;
if (aix_check_ifix(release:"6.1", ml:"01", patch:"IZ71611_01", package:"bos.net.tcp.client", minfilesetver:"6.1.1.0", maxfilesetver:"6.1.1.7") < 0) flag++;
if (flag)
{
if (report_verbosity > 0) security_warning(port:0, extra:aix_report_get());
else security_warning(0);
exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");