Vulnerability Details : CVE-2017-5567
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.
Products affected by CVE-2017-5567
- cpe:2.3:a:avast:internet_security:*:*:*:*:*:*:*:*
- cpe:2.3:a:avast:free_antivirus:*:*:*:*:*:*:*:*
- cpe:2.3:a:avast:premier:*:*:*:*:*:*:*:*
- cpe:2.3:a:avast:pro_antivirus:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2017-5567
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2017-5567
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
7.2
|
HIGH | AV:L/AC:L/Au:N/C:C/I:C/A:C |
3.9
|
10.0
|
NIST | |
6.7
|
MEDIUM | CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
0.8
|
5.9
|
NIST |
CWE ids for CVE-2017-5567
-
The product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors.Assigned by: nvd@nist.gov (Primary)
References for CVE-2017-5567
-
http://cybellum.com/doubleagent-taking-full-control-antivirus/
DoubleAgent: Taking Full Control Over Your Antivirus | CybellumThird Party Advisory
-
http://cybellum.com/doubleagentzero-day-code-injection-and-persistence-technique/
DoubleAgent: Zero-Day Code Injection and Persistence Technique | CybellumTechnical Description;Third Party Advisory
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http://www.securityfocus.com/bid/97017
Multiple Avast Products CVE-2017-5567 DLL Loading Local Code Injection VulnerabilityThird Party Advisory;VDB Entry
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