Vulnerability in Actfax
CVE-2020-15843
ActFax Version 7.10 Build 0335 (2020-05-25) is susceptible to a privilege escalation vulnerability due to insecure folder permissions on %PROGRAMFILES%\ActiveFax\Client\, %PROGRAMFILES%\ActiveFax\Install\ and %PROGRAMFILES%\ActiveFax\Terminal\. The folder permissions allow "Full Control" to "Everyone". An authenticated local attacker can exploit this to replace the TSClientB.exe binary in the Terminal directory, which is executed on logon for every user. Alternatively, the attacker can replace any of the binaries in the Client or Install directories. The latter requires additional user interaction, for example starting the client.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (31.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.4% 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
- Actfax — versions 7.10
Weakness classification (CWE)
References
- blog.to.com/advisory-actfax-7-10-build-0335-privilege-escalation-cve-2020-15843/ (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-15843?
- CVE-2020-15843 is a high-severity vulnerability in Actfax, classified under Incorrect Default Permissions. CVSS score: 7.3/10. Published 2020-09-24.
- How severe is CVE-2020-15843?
- High severity. CVSS v3 base score is 7.3 out of 10.