Vulnerability Description
Code injection vulnerability in Avast Premier 12.3 (and earlier), Internet Security 12.3 (and earlier), Pro Antivirus 12.3 (and earlier), and Free Antivirus 12.3 (and earlier) allows a local attacker to bypass a self-protection mechanism, inject arbitrary code, and take full control of any Avast process via a "DoubleAgent" attack. One perspective on this issue is that (1) these products do not use the Protected Processes feature, and therefore an attacker can enter an arbitrary Application Verifier Provider DLL under Image File Execution Options in the registry; (2) the self-protection mechanism is intended to block all local processes (regardless of privileges) from modifying Image File Execution Options for these products; and (3) this mechanism can be bypassed by an attacker who temporarily renames Image File Execution Options during the attack.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Avast | Free Antivirus | <= 12.3 |
| Avast | Internet Security | <= 12.3 |
| Avast | Premier | <= 12.3 |
| Avast | Pro Antivirus | <= 12.3 |
Related Weaknesses (CWE)
References
- http://cybellum.com/doubleagent-taking-full-control-antivirus/Third Party Advisory
- http://cybellum.com/doubleagentzero-day-code-injection-and-persistence-techniqueTechnical DescriptionThird Party Advisory
- http://www.securityfocus.com/bid/97017Third Party AdvisoryVDB Entry
- http://cybellum.com/doubleagent-taking-full-control-antivirus/Third Party Advisory
- http://cybellum.com/doubleagentzero-day-code-injection-and-persistence-techniqueTechnical DescriptionThird Party Advisory
- http://www.securityfocus.com/bid/97017Third Party AdvisoryVDB Entry
FAQ
What is CVE-2017-5567?
CVE-2017-5567 is a vulnerability with a CVSS score of 6.7 (MEDIUM). Code injection vulnerability in Avast Premier 12.3 (and earlier), Internet Security 12.3 (and earlier), Pro Antivirus 12.3 (and earlier), and Free Antivirus 12.3 (and earlier) allows a local attacker ...
How severe is CVE-2017-5567?
CVE-2017-5567 has been rated MEDIUM with a CVSS base score of 6.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-5567?
Check the references section above for vendor advisories and patch information. Affected products include: Avast Free Antivirus, Avast Internet Security, Avast Premier, Avast Pro Antivirus.