Buffer overflow in Comodo Antivirus
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (30.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Comodo Antivirus
- Comodo Antivirus — versions Versions 11.0.0.6582 and below
Weakness classification (CWE)
References
- www.tenable.com/security/research/tra-2019-34 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-3973?
- CVE-2019-3973 is a medium-severity vulnerability in Comodo Antivirus, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2019-07-17.
- How severe is CVE-2019-3973?
- Medium severity. CVSS v3 base score is 5.5 out of 10.