CVE-2016-4226

published 2016-07-13

CVE-2016-4226: Use-after-free vulnerability in Adobe Flash Player before 18.0.0.366 and 19.x through 22.x before 22.0.0.209 on Windows and OS X and before 11.2.202.632 on…

Priority P2 71 high 8.8 CVSS 3.1

AV N AC L PR N UI R S U C H I H A H

EXPLOIT

Use-after-free vulnerability in Adobe Flash Player before 18.0.0.366 and 19.x through 22.x before 22.0.0.209 on Windows and OS X and before 11.2.202.632 on Linux allows attackers to execute arbitrary code via unspecified vectors, a different vulnerability than CVE-2016-4173, CVE-2016-4174, CVE-2016-4222, CVE-2016-4227, CVE-2016-4228, CVE-2016-4229, CVE-2016-4230, CVE-2016-4231, and CVE-2016-4248.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
adobe	flash_player	<= 18.0.0.360	—
adobe	flash_player	<= 22.0.0.192	—
adobe	flash_player	<= 11.2.202.626	—
adobe	flash_player_desktop_runtime	<= 22.0.0.192	—

Detection & IOCs extracted from sources · hover to see the quote

url https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/40308.zip↗

command mc.func = ASnative(666, 4);↗

• → Trigger is the Stage.align property setter (ASnative 666, 4) being called on a MovieClip object whose toString callback removes the MovieClip mid-execution, causing a use-after-free. ↗
• → Look for ActionScript calling ASnative(666, 4) — the internal ID for the Stage.align setter — as a suspicious invocation pattern in SWF files. ↗
• → Exploit PoC uses createEmptyMovieClip followed by removeMovieClip inside a toString callback and a TextFormat allocation loop to reclaim freed memory; this sequence in a SWF is a strong indicator of exploitation. ↗
• → Crash/exploitation occurs in Chrome for Windows when a crafted SWF exercises this code path; monitor for Flash Player crashes originating from Stage.align setter calls. ↗

• · Affected versions span a wide range: Flash Player before 18.0.0.366, 19.x–22.x before 22.0.0.209 (Windows/OS X), and before 11.2.202.632 (Linux); detections should account for all three version tracks. ↗
• · CVE-2016-4226 is one of ten distinct use-after-free vulnerabilities patched in the same Flash update; the Stage.align PoC (Exploit-DB 40308) is attributed to CVE-2016-4226 via the Project Zero bug tracker, but the NVD source document references CVE-2016-4229 in the same advisory — verify the exact CVE mapping before deploying detections. ↗

CVSS provenance

nvd v3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

nvd v2.0 9.3 CRITICAL AV:N/AC:M/Au:N/C:C/I:C/A:C

osv 8.8 HIGH

vendor_redhat 8.8 HIGH

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CWE-416