Home/CVE/Code injection vulnerability in AVG Ultimate 17.1 (and earlier), AVG Internet Security 17.1 (and earlier), and AVG AntiV
CVE

CVE-2017-5566

Code injection vulnerability in AVG Ultimate 17.1 (and earlier), AVG Internet Security 17.1 (and earlier), and AVG AntiV

Code injection vulnerability in AVG Ultimate 17.1 (and earlier), AVG Internet Security 17.1 (and earlier), and AVG AntiVirus FREE 17.1 (and earlier) allows a local attacker to bypass a self-protection mechanism, inject arbitrary code, and take full control of any AVG 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.

MEDIUM · CVSS 6.7 EPSS 0.0007
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-427Uncontrolled Search Path Element
▤

Affected Products & Versions

3
avg anti-virusall versions
avg internet securityall versions
avg ultimateall versions
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighRelevant Anti-Virus Signature Keywords In Application Log
▣

Scoring & Timeline

6.7
MEDIUM · CVSS v3.0 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD21 Mar 2017 · 04:59 PM
CVSS VectorCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
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References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://cybellum.com/doubleagent-taking-full-control-antivirus/Third Party Advisory
http://cybellum.com/doubleagentzero-day-code-injection-and-persistence-technique/Technical DescriptionThird Party Advisory
http://www.securityfocus.com/bid/97022Third Party AdvisoryVDB Entry
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