CVE-2019-3973

Comodo Antivirus versions 11.0.0.6582 and below are vulnerable to Denial of Service affecting CmdGuard.sys via its filter port "cmdServicePort". A low privileged process can crash CmdVirth.exe to decrease the port's connection count followed by process hollowing a CmdVirth.exe instance with malicious code to obtain a handle to "cmdServicePort". Once this occurs, a specially crafted message can be sent to "cmdServicePort" using "FilterSendMessage" API. This can trigger an out-of-bounds write if lpOutBuffer parameter in FilterSendMessage API is near the end of specified buffer bounds. The crash occurs when the driver performs a memset operation which uses a size beyond the size of buffer specified, causing kernel crash.

CVSS v3 5.5 MEDIUM
CVSS v2.0 4.9 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

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

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

4.9^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 3.9 / Impact : 6.9

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact COMPLETE

References

Link	Resource
https://www.tenable.com/security/research/tra-2019-34	Exploit Third Party Advisory
https://www.tenable.com/security/research/tra-2019-34	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:comodo:antivirus:*:*:*:*:*:*:*:*

History

21 Nov 2024, 04:42

Type	Values Removed	Values Added
References	~~() https://www.tenable.com/security/research/tra-2019-34 - Exploit, Third Party Advisory~~	() https://www.tenable.com/security/research/tra-2019-34 - Exploit, Third Party Advisory

Information

Published : 2019-07-17 21:15

Updated : 2024-11-21 04:42

NVD link : CVE-2019-3973

Mitre link : CVE-2019-3973

CVE.ORG link : CVE-2019-3973

JSON object : View

Products Affected

comodo

antivirus

CWE

CWE-787

Out-of-bounds Write

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