Vulnerabilities > CVE-2019-3970 - Improper Input Validation vulnerability in Comodo Antivirus

047910
CVSS 2.1 - LOW
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
PARTIAL
Availability impact
NONE
local
low complexity
comodo
CWE-20
nessus

Summary

Comodo Antivirus versions up to 12.0.0.6810 are vulnerable to Arbitrary File Write due to Cavwp.exe handling of Comodo's Antivirus database. Cavwp.exe loads Comodo antivirus definition database in unsecured global section objects, allowing a local low privileged process to modify this data directly and change virus signatures.

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Server Side Include (SSI) Injection
    An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
  • Cross Zone Scripting
    An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
  • Cross Site Scripting through Log Files
    An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
  • Command Line Execution through SQL Injection
    An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.

Nessus

NASL familyWindows
NASL idCOMODO_TRA_2019_34.NASL
descriptionThe version of the Comodo security product installed on the remote Windows host is affected by multiple vulnerabilities: - A Local Privilege Escalation due to CmdAgent
last seen2020-06-01
modified2020-06-02
plugin id126953
published2019-07-23
reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/126953
titleComodo Antivirus / Internet Security Multiple Vulnerabilities
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(126953);
  script_version("1.2");
  script_cvs_date("Date: 2019/10/18 23:14:15");

  script_cve_id(
    "CVE-2019-3969",
    "CVE-2019-3970",
    "CVE-2019-3971",
    "CVE-2019-3972"
  );
  script_xref(name:"TRA", value:"TRA-2019-34");

  script_name(english:"Comodo Antivirus / Internet Security Multiple Vulnerabilities");
  script_summary(english:"Checks version of Comodo Internet Security");

  script_set_attribute(attribute:"synopsis", value:
"The remote Windows host has an antivirus application installed that 
is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of the Comodo security product installed on the remote Windows
host is affected by multiple vulnerabilities:

  - A Local Privilege Escalation due to CmdAgent's handling
    of COM clients. A local process can bypass the signature
    check enforced by CmdAgent via process hollowing which
    can then allow the process to invoke sensitive COM
    methods in CmdAgent such as writing to the registry with
    SYSTEM privileges.(CVE-2019-3969)

  - An Arbitrary File Write due to Cavwp.exe handling of
    Comodo's Antivirus database. Cavwp.exe loads Comodo
    antivirus definition database in unsecured global
    section objects, allowing a local low privileged process
    to modify this data directly and change virus
    signatures. (CVE-2019-3970)

  - A local Denial of Service affecting CmdVirth.exe via its
    LPC port cmdvrtLPCServerPort. A low privileged local
    process can connect to this port and send an
    LPC_DATAGRAM, which triggers an Access Violation due to
    hardcoded NULLs used for Source parameter in a memcpy
    operation that is called for this handler. This results
    in CmdVirth.exe and its child svchost.exe instances to
    terminate. (CVE-2019-3971)

  - A Denial of Service affecting CmdAgent.exe via an
    unprotected section object <GUID>_CisSharedMemBuff. This
    section object is exposed by CmdAgent and contains a
    SharedMemoryDictionary object, which allows a low
    privileged process to modify the object data causing
    CmdAgent.exe to crash. (CVE-2019-3972)

Note that Nessus has not tested for this issue but has instead relied
only on the application's self-reported version number.");
  # https://www.tenable.com/security/research/tra-2019-34
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2c5df8c5");
  script_set_attribute(attribute:"solution", value:
"No known fix, refer to vendor for further information.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  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:N/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-2019-3969");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/07/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/07/23");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows");

  script_copyright(english:"This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("comodo_internet_security_installed.nasl");
  script_require_keys("SMB/Comodo Internet Security/Version", "SMB/Comodo Internet Security/Path");

  exit(0);
}

include("vcf.inc");

app = "Comodo Internet Security";
app_info = vcf::get_app_info(app:app);

if (report_paranoia < 2)
{
  if(ver_compare(ver:app_info.version, fix:"12.0.0.6810")>0)
    audit(AUDIT_POTENTIAL_VULN, app, app_info.version);
  constraints = [{ "min_version" : "0", "max_version":"12.0.0.6810", "fixed_display":"No known fix, refer to vendor for further information."}];
}
else
  constraints = [{ "min_version" : "0", "fixed_display":"No known fix, refer to vendor for further information."}];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);