5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0.693 Medium
EPSS
Percentile
98.0%
According to its SIP banner, the version of Asterisk running on the remote host is 13.x prior to 13.18.3, 14.x prior to 14.7.3, 15.x prior to 15.1.3, or 13.13 prior to 13.13-cert8. It is therefore, affected by a memory exhaustion remote denial-of-service attack as described in AST-2017-013.
Also note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(105041);
script_version("1.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");
script_cve_id("CVE-2017-17090");
script_bugtraq_id(102023);
script_name(english:"Asterisk 13.x < 13.18.3 / 14.x < 14.7.3 / 15.x < 15.1.3 / 13.13 < 13.13-cert8 Memory Exhaustion Remote DoS (AST-2017-013)");
script_set_attribute(attribute:"synopsis", value:
"A telephony application running on the remote host is affected by
a memory exhaustion remote denial-of-service vulnerability.");
script_set_attribute(attribute:"description", value:
"According to its SIP banner, the version of Asterisk running on the
remote host is 13.x prior to 13.18.3, 14.x prior to 14.7.3, 15.x prior
to 15.1.3, or 13.13 prior to 13.13-cert8. It is therefore, affected by
a memory exhaustion remote denial-of-service attack as described in
AST-2017-013.
Also note that Nessus has not tested for these issues but has instead
relied only on the application's self-reported version number.");
script_set_attribute(attribute:"see_also", value:"http://downloads.asterisk.org/pub/security/AST-2017-013.html");
script_set_attribute(attribute:"solution", value:
"Upgrade to Asterisk version 13.18.3 / 14.7.3 / 15.1.3 / 13.13-cert8 or later.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-17090");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2017/11/29");
script_set_attribute(attribute:"patch_publication_date", value:"2017/12/01");
script_set_attribute(attribute:"plugin_publication_date", value:"2017/12/06");
script_set_attribute(attribute:"potential_vulnerability", value:"true");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:digium:asterisk");
script_set_attribute(attribute:"thorough_tests", value:"true");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Misc.");
script_copyright(english:"This script is Copyright (C) 2017-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("asterisk_detection.nasl");
script_require_keys("asterisk/sip_detected", "Settings/ParanoidReport");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
get_kb_item_or_exit("asterisk/sip_detected");
asterisk_kbs = get_kb_list_or_exit("sip/asterisk/*/version");
if (report_paranoia < 2) audit(AUDIT_PARANOID);
is_vuln = FALSE;
not_vuln_installs = make_list();
errors = make_list();
foreach kb_name (keys(asterisk_kbs))
{
vulnerable = 0;
matches = pregmatch(pattern:"/(udp|tcp)/([0-9]+)/version", string:kb_name);
if (isnull(matches))
{
errors = make_list(errors, "Unexpected error parsing port number from '"+kb_name+"'.");
continue;
}
proto = matches[1];
port = matches[2];
version = asterisk_kbs[kb_name];
if (version == 'unknown')
{
errors = make_list(errors, "Unable to obtain version of installation on " + proto + "/" + port + ".");
continue;
}
banner = get_kb_item("sip/asterisk/" + proto + "/" + port + "/source");
if (!banner)
{
# We have version but banner is missing;
# log error and use in version-check though.
errors = make_list(errors, "KB item 'sip/asterisk/" + proto + "/" + port + "/source' is missing.");
banner = 'unknown';
}
if (version =~ "^13([^0-9])" && "cert" >!< tolower(version))
{
fixed = "13.18.3";
vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
}
else if (version =~ "^14([^0-9])" && "cert" >!< tolower(version))
{
fixed = "14.7.3";
vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
}
else if (version =~ "^15([^0-9])" && "cert" >!< tolower(version))
{
fixed = "15.1.3";
vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
}
else if (version =~ "^13\.13([^0-9])" && "cert" >< tolower(version))
{
fixed = "13.13-cert8";
vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
}
if (vulnerable < 0)
{
is_vuln = TRUE;
report =
'\n Version source : ' + banner +
'\n Installed version : ' + version +
'\n Fixed version : ' + fixed +
'\n';
security_report_v4(severity:SECURITY_WARNING, port:port, proto:proto, extra:report);
}
else not_vuln_installs = make_list(not_vuln_installs, version + " on port " + proto + "/" + port);
}
if (max_index(errors))
{
if (max_index(errors) == 1) errmsg = errors[0];
else errmsg = 'Errors were encountered verifying installations : \n ' + join(errors, sep:'\n ');
exit(1, errmsg);
}
else
{
installs = max_index(not_vuln_installs);
if (installs == 0)
{
if (is_vuln) exit(0);
else audit(AUDIT_NOT_INST, "Asterisk");
}
else audit(AUDIT_INST_VER_NOT_VULN, "Asterisk", not_vuln_installs);
}
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0.693 Medium
EPSS
Percentile
98.0%