CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
EPSS
Percentile
5.1%
According to its self-reported version, Cisco AnyConnect Secure Mobility Client is affected by a arbitrary code execution vulnerability. The vulnerability is due to a lack of authentication to the IPC listener. An authenticated, local attacker could exploit this vulnerability by sending crafted IPC messages to the AnyConnect client IPC listener.
A successful exploit could allow an attacker to cause the targeted AnyConnect user to execute a malicious script. This script would execute with the privileges of the targeted AnyConnect user.
Please see the included Cisco BIDs and Cisco Security Advisory for more information.
#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(156549);
script_version("1.3");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");
script_cve_id("CVE-2020-3556");
script_xref(name:"IAVA", value:"2020-A-0505-S");
script_xref(name:"CISCO-BUG-ID", value:"CSCvv30103");
script_xref(name:"CISCO-SA", value:"cisco-sa-anyconnect-ipc-KfQO9QhK");
script_name(english:"Linux: Cisco AnyConnect Secure Mobility Client Arbitrary Code Execution (cisco-sa-anyconnect-ipc-KfQO9QhK)");
script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch");
script_set_attribute(attribute:"description", value:
"According to its self-reported version, Cisco AnyConnect Secure Mobility Client is affected by a arbitrary code
execution vulnerability. The vulnerability is due to a lack of authentication to the IPC listener. An authenticated,
local attacker could exploit this vulnerability by sending crafted IPC messages to the AnyConnect client IPC listener.
A successful exploit could allow an attacker to cause the targeted AnyConnect user to execute a malicious script. This
script would execute with the privileges of the targeted AnyConnect user.
Please see the included Cisco BIDs and Cisco Security Advisory for more information.");
# https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-ipc-KfQO9QhK
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?601e2110");
script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvv30103");
script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvv30103");
script_set_attribute(attribute:"agent", value:"unix");
script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-3556");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"vuln_publication_date", value:"2020/11/04");
script_set_attribute(attribute:"patch_publication_date", value:"2020/11/04");
script_set_attribute(attribute:"plugin_publication_date", value:"2022/01/07");
script_set_attribute(attribute:"potential_vulnerability", value:"true");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:anyconnect_secure_mobility_client");
script_set_attribute(attribute:"stig_severity", value:"I");
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) 2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("cisco_anyconnect_client_nix_installed.nbin");
script_require_keys("installed_sw/Cisco AnyConnect Secure Mobility Client", "Host/local_checks_enabled", "Settings/ParanoidReport");
exit(0);
}
include('vcf.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
# We cannot test for the full vulnerable condition
if (report_paranoia < 2) audit(AUDIT_PARANOID);
var app_info = vcf::get_app_info(app:'Cisco AnyConnect Secure Mobility Client');
var constraints = [{ 'max_version' : '4.10.0', 'fixed_display' : 'See vendor advisory' }];
vcf::check_version_and_report(
app_info:app_info,
constraints:constraints,
severity:SECURITY_WARNING
);
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
EPSS
Percentile
5.1%