Comodo Antivirus / Internet Security Multiple Vulnerabilities

high Nessus Plugin ID 126953


The remote Windows host has an antivirus application installed that is affected by multiple vulnerabilities.


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.


No known fix, refer to vendor for further information.

See Also

Plugin Details

Severity: High

ID: 126953

File Name: comodo_tra_2019_34.nasl

Version: 1.2

Type: local

Agent: windows

Family: Windows

Published: 7/23/2019

Updated: 10/18/2019

Supported Sensors: Nessus Agent

Risk Information


Risk Factor: Medium

Score: 6.7


Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: E:U/RL:OF/RC:C

CVSS Score Source: CVE-2019-3969


Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

Required KB Items: SMB/Comodo Internet Security/Version, SMB/Comodo Internet Security/Path

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 7/16/2019

Reference Information

CVE: CVE-2019-3969, CVE-2019-3970, CVE-2019-3971, CVE-2019-3972