Vulnerability Description
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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Comodo | Antivirus | <= 11.0.0.6582 |
Related Weaknesses (CWE)
References
- https://www.tenable.com/security/research/tra-2019-34ExploitThird Party Advisory
- https://www.tenable.com/security/research/tra-2019-34ExploitThird Party Advisory
FAQ
What is CVE-2019-3973?
CVE-2019-3973 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 decr...
How severe is CVE-2019-3973?
CVE-2019-3973 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-3973?
Check the references section above for vendor advisories and patch information. Affected products include: Comodo Antivirus.