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
EPSS
Percentile
81.0%
According to the version in its SIP banner, the version of Asterisk running on the remote host is potentially affected by a denial of service vulnerability. This flaw exists due to improper handling of state transitions which could allow a remote attacker to crash the application.
Note that Nessus has not tested for this issue 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(79440);
script_version("1.9");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");
script_cve_id("CVE-2014-8414");
script_bugtraq_id(71222);
script_name(english:"Asterisk ConfBridge State Transitions DoS (AST-2014-014)");
script_set_attribute(attribute:"synopsis", value:
"A telephony application running on the remote host is affected by a
denial of service vulnerability.");
script_set_attribute(attribute:"description", value:
"According to the version in its SIP banner, the version of Asterisk
running on the remote host is potentially affected by a denial of
service vulnerability. This flaw exists due to improper handling of
state transitions which could allow a remote attacker to crash the
application.
Note that Nessus has not tested for this issue 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-2014-014.html");
script_set_attribute(attribute:"see_also", value:"https://issues.asterisk.org/jira/browse/ASTERISK-24440");
script_set_attribute(attribute:"solution", value:
"Upgrade to Asterisk 11.14.1 / 11.6-cert8 or apply the appropriate
patch listed in the Asterisk advisory.");
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:U/RL:OF/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2014/11/20");
script_set_attribute(attribute:"patch_publication_date", value:"2014/11/20");
script_set_attribute(attribute:"plugin_publication_date", value:"2014/11/25");
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) 2014-2022 Tenable Network Security, Inc.");
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 = eregmatch(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 install 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';
}
# Open Source 11x < 11.14.1
if (version =~ "^11([^0-9]|$)" && "cert" >!< tolower(version))
{
fixed = "11.14.1";
vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
}
# Asterisk Certified 11.6.x < 11.6-cert8
else if (version =~ "^11\.6([^0-9])" && "cert" >< tolower(version))
{
fixed = "11.6-cert8";
vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
}
if (vulnerable < 0)
{
is_vuln = TRUE;
if (report_verbosity > 0)
{
report =
'\n Version source : ' + banner +
'\n Installed version : ' + version +
'\n Fixed version : ' + fixed +
'\n';
security_warning(port:port, proto:proto, extra:report);
}
else security_warning(port:port, proto:proto);
}
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 installs : \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);
}