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
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
Percentile
47.8%
AVG Antivirus is prone to a dll preloading vulnerability.
# SPDX-FileCopyrightText: 2019 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only
CPE = "cpe:/a:avg:anti-virus";
if(description)
{
script_oid("1.3.6.1.4.1.25623.1.0.107738");
script_version("2024-02-15T05:05:40+0000");
script_tag(name:"cvss_base", value:"4.4");
script_tag(name:"cvss_base_vector", value:"AV:L/AC:M/Au:N/C:P/I:P/A:P");
script_tag(name:"last_modification", value:"2024-02-15 05:05:40 +0000 (Thu, 15 Feb 2024)");
script_tag(name:"severity_vector", value:"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
script_tag(name:"severity_origin", value:"NVD");
script_tag(name:"severity_date", value:"2019-10-29 13:12:00 +0000 (Tue, 29 Oct 2019)");
script_tag(name:"creation_date", value:"2019-11-01 14:51:54 +0100 (Fri, 01 Nov 2019)");
script_tag(name:"qod_type", value:"registry");
script_tag(name:"solution_type", value:"VendorFix");
script_cve_id("CVE-2019-17093");
script_name("AVG Antivirus (All Editions) < 19.8 DLL Preloading Vulnerability - Windows");
script_copyright("Copyright (C) 2019 Greenbone AG");
script_category(ACT_GATHER_INFO);
script_family("General");
script_dependencies("secpod_avg_detect_win.nasl");
script_mandatory_keys("avg/antivirus/detected");
script_tag(name:"summary", value:"AVG Antivirus is prone to a dll preloading vulnerability.");
script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
script_tag(name:"insight", value:"The vulnerability gives attackers the ability to:
- load and execute malicious payloads using multiple signed services, within the context of Avast
signed processes
- bypass the part of the self-defense mechanism that should prevent an attacker from tampering with processes
and files of Avast Antivirus and load an arbitrary DLL into the Antivirus process
- load and execute malicious payloads in a persistent way, each time the services are loaded.");
script_tag(name:"impact", value:"The vulnerability can be used to achieve self-defense bypass, defense evasion,
persistence and privilege escalation.");
script_tag(name:"affected", value:"All Editions of AVG Antivirus before version 19.8.");
script_tag(name:"solution", value:"Update to AVG Antivirus version 19.8 or later.");
script_xref(name:"URL", value:"https://safebreach.com/Post/Avast-Antivirus-AVG-Antivirus-DLL-Preloading-into-PPL-and-Potential-Abuses");
exit(0);
}
include( "version_func.inc" );
include( "host_details.inc" );
if( ! infos = get_app_version_and_location( cpe:CPE, exit_no_version:TRUE ) )
exit( 0 );
vers = infos["version"];
path = infos["location"];
if( version_is_less( version:vers, test_version:"19.8" ) ) {
report = report_fixed_ver( installed_version:vers, fixed_version:"19.8", install_path:path );
security_message( data:report, port:0 );
exit( 0 );
}
exit( 99 );
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
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
Percentile
47.8%