CVE-2016-3861

Google Android - libutils UTF16 to UTF8 Conversion Heap Buffer Overflow

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

LibUtils in Android 4.x before 4.4.4, 5.0.x before 5.0.2, 5.1.x before 5.1.1, 6.x before 2016-09-01, and 7.0 before 2016-09-01 mishandles conversions between Unicode character encodings with different encoding widths, which allows remote attackers to execute arbitrary code or cause a denial of service (heap-based buffer overflow) via a crafted file, aka internal bug 29250543.

LibUtils en Android 4.x en versiones anteriores a 4.4.4, 5.0.x en versiones anteriores a 5.0.2, 5.1.x en versiones anteriores a 5.1.1, 6.x en versiones anteriores a 2016-09-01 y 7.0 en versiones anteriores a 2016-09-01 no maneja correctamente conversiones entre codificaciones de caracteres Unicode y anchuras de codificación diferentes, lo que permite a atacantes remotos ejecutar código arbitrario o provocar una denegación de servicio (desbordamiento de búfer basado en memoria dinámica) a través de un archivo manipulado, vulnerabilidad también conocida como error interno 29250543.

Android suffers from an inconsistency between the way that the two functions in libutils/Unicode.cpp handle invalid surrogate pairs in UTF16, resulting in a mismatch between the size calculated by utf16_to_utf8_length and the number of bytes written by utf16_to_utf8. This results in a heap buffer overflow.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-03-30 CVE Reserved
2016-09-08 CVE Published
2022-10-27 First Exploit
2024-07-04 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-264: Permissions, Privileges, and Access Controls

CAPEC

References (9)

URL	Tag	Source
http://www.securityfocus.com/bid/92811	Vdb Entry
http://www.securitytracker.com/id/1036763	Vdb Entry

URL	Date	SRC
https://www.exploit-db.com/exploits/40354	2024-08-06
https://github.com/zxkevn/CVE-2016-3861	2022-10-27

URL	Date	SRC
https://android.googlesource.com/platform/frameworks/av/+/3944c65637dfed14a5a895685edfa4bacaf9f76e	2017-09-03
https://android.googlesource.com/platform/frameworks/base/+/866dc26ad4a98cc835d075b627326e7d7e52ffa1	2017-09-03
https://android.googlesource.com/platform/frameworks/native/+/1f4b49e64adf4623eefda503bca61e253597b9bf	2017-09-03
https://android.googlesource.com/platform/system/core/+/ecf5fd58a8f50362ce9e8d4245a33d56f29f142b	2017-09-03

URL	Date	SRC
http://source.android.com/security/bulletin/2016-09-01.html	2017-09-03

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.0 Search vendor "Google" for product "Android" and version "4.0"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.0.1 Search vendor "Google" for product "Android" and version "4.0.1"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.0.2 Search vendor "Google" for product "Android" and version "4.0.2"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.0.3 Search vendor "Google" for product "Android" and version "4.0.3"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.0.4 Search vendor "Google" for product "Android" and version "4.0.4"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.1 Search vendor "Google" for product "Android" and version "4.1"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.1.2 Search vendor "Google" for product "Android" and version "4.1.2"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.2 Search vendor "Google" for product "Android" and version "4.2"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.2.1 Search vendor "Google" for product "Android" and version "4.2.1"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.2.2 Search vendor "Google" for product "Android" and version "4.2.2"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.3 Search vendor "Google" for product "Android" and version "4.3"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.3.1 Search vendor "Google" for product "Android" and version "4.3.1"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.4 Search vendor "Google" for product "Android" and version "4.4"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.4.1 Search vendor "Google" for product "Android" and version "4.4.1"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.4.2 Search vendor "Google" for product "Android" and version "4.4.2"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				4.4.3 Search vendor "Google" for product "Android" and version "4.4.3"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				5.0 Search vendor "Google" for product "Android" and version "5.0"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				5.0.1 Search vendor "Google" for product "Android" and version "5.0.1"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				5.1 Search vendor "Google" for product "Android" and version "5.1"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				5.1.0 Search vendor "Google" for product "Android" and version "5.1.0"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				6.0 Search vendor "Google" for product "Android" and version "6.0"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				6.0.1 Search vendor "Google" for product "Android" and version "6.0.1"		-		Affected
Google Search vendor "Google"		Android Search vendor "Google" for product "Android"				7.0 Search vendor "Google" for product "Android" and version "7.0"		-		Affected