CVE-2019-3973
First published: Wed Jul 17 2019(Updated: )
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.
Credit: vulnreport@tenable.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Comodo Antivirus | <=11.0.0.6582 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2019-3973?
CVE-2019-3973 is classified as a Denial of Service vulnerability.
How do I fix CVE-2019-3973?
To mitigate CVE-2019-3973, upgrade Comodo Antivirus to a version above 11.0.0.6582.
What versions of Comodo Antivirus are affected by CVE-2019-3973?
CVE-2019-3973 affects Comodo Antivirus versions 11.0.0.6582 and below.
What component of Comodo Antivirus is vulnerable in CVE-2019-3973?
The vulnerability in CVE-2019-3973 specifically involves the CmdGuard.sys filter port 'cmdServicePort'.
Can a low-privileged process exploit CVE-2019-3973?
Yes, a low-privileged process can exploit CVE-2019-3973 to crash CmdVirth.exe.
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- agent/last-modified-date
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- vendor/comodo
- canonical/comodo antivirus
- version/comodo antivirus/11.0.0.6582