Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 15.0%
CVSS Severity
CVSS v3 Score 5.5
CVSS v2 Score 4.9
References
Products affected by CVE-2019-3973
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cpe:2.3:a:comodo:antivirus:1.0
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cpe:2.3:a:comodo:antivirus:11.0.0.6582
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cpe:2.3:a:comodo:antivirus:2.2
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cpe:2.3:a:comodo:antivirus:8.1