CVE-2016-5636

python: Heap overflow in zipimporter module

Severity Score

9.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Integer overflow in the get_data function in zipimport.c in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 allows remote attackers to have unspecified impact via a negative data size value, which triggers a heap-based buffer overflow.

Desbordamiento de entero en la función get_data en zipimport.c en CPython (también conocido como Python) en versiones anteriores a 2.7.12, 3.x en versiones anteriores a 3.4.5 y 3.5.x en versiones anteriores a 3.5.2 permite a atacantes remotos tener impacto no especificado a través de un valor de tamaño de datos negativo, lo que desencadena un desbordamiento de búfer basado en memoria dinámica.

A vulnerability was discovered in Python, in the built-in zipimporter. A specially crafted zip file placed in a module path such that it would be loaded by a later "import" statement could cause a heap overflow, leading to arbitrary code execution.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix: A vulnerability was discovered in Python, in the built-in zipimporter. A specially crafted zip file placed in a module path such that it would be loaded by a later "import" statement could cause a heap overflow, leading to arbitrary code execution.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-06-16 CVE Reserved
2016-09-02 CVE Published
2020-08-10 First Exploit
2024-08-06 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-122: Heap-based Buffer Overflow
CWE-190: Integer Overflow or Wraparound

CAPEC

References (18)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2016/06/15/15	Mailing List
http://www.openwall.com/lists/oss-security/2016/06/16/1	Mailing List
http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html	X_refsource_confirm
http://www.securityfocus.com/bid/91247	Vdb Entry
http://www.securitytracker.com/id/1038138	Vdb Entry
http://www.splunk.com/view/SP-CAAAPSV	X_refsource_confirm
http://www.splunk.com/view/SP-CAAAPUE	X_refsource_confirm
https://docs.python.org/3.4/whatsnew/changelog.html#python-3-4-5	Release Notes
https://docs.python.org/3.5/whatsnew/changelog.html#python-3-5-2	Release Notes
https://hg.python.org/cpython/raw-file/v2.7.12/Misc/NEWS	Release Notes
https://lists.debian.org/debian-lts-announce/2019/02/msg00011.html	Mailing List

URL	Date	SRC
https://github.com/insuyun/CVE-2016-5636	2020-08-10

URL	Date	SRC
https://bugs.python.org/issue26171	2019-02-09

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html	2019-02-09
http://rhn.redhat.com/errata/RHSA-2016-2586.html	2019-02-09
https://security.gentoo.org/glsa/201701-18	2019-02-09
https://access.redhat.com/security/cve/CVE-2016-5636	2016-11-03
https://bugzilla.redhat.com/show_bug.cgi?id=1345856	2016-11-03

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.0 Search vendor "Python" for product "Python" and version "3.0"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.0.1 Search vendor "Python" for product "Python" and version "3.0.1"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.1.0 Search vendor "Python" for product "Python" and version "3.1.0"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.1.1 Search vendor "Python" for product "Python" and version "3.1.1"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.1.2 Search vendor "Python" for product "Python" and version "3.1.2"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.1.3 Search vendor "Python" for product "Python" and version "3.1.3"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.1.4 Search vendor "Python" for product "Python" and version "3.1.4"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.1.5 Search vendor "Python" for product "Python" and version "3.1.5"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.2.0 Search vendor "Python" for product "Python" and version "3.2.0"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.2.1 Search vendor "Python" for product "Python" and version "3.2.1"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.2.2 Search vendor "Python" for product "Python" and version "3.2.2"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.2.3 Search vendor "Python" for product "Python" and version "3.2.3"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.2.4 Search vendor "Python" for product "Python" and version "3.2.4"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.2.5 Search vendor "Python" for product "Python" and version "3.2.5"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.2.6 Search vendor "Python" for product "Python" and version "3.2.6"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.3.0 Search vendor "Python" for product "Python" and version "3.3.0"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.3.1 Search vendor "Python" for product "Python" and version "3.3.1"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.3.2 Search vendor "Python" for product "Python" and version "3.3.2"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.3.3 Search vendor "Python" for product "Python" and version "3.3.3"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.3.4 Search vendor "Python" for product "Python" and version "3.3.4"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.3.5 Search vendor "Python" for product "Python" and version "3.3.5"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.3.6 Search vendor "Python" for product "Python" and version "3.3.6"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.4.0 Search vendor "Python" for product "Python" and version "3.4.0"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.4.1 Search vendor "Python" for product "Python" and version "3.4.1"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.4.2 Search vendor "Python" for product "Python" and version "3.4.2"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.4.3 Search vendor "Python" for product "Python" and version "3.4.3"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.4.4 Search vendor "Python" for product "Python" and version "3.4.4"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				<= 2.7.11 Search vendor "Python" for product "Python" and version " <= 2.7.11"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.5.0 Search vendor "Python" for product "Python" and version "3.5.0"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				3.5.1 Search vendor "Python" for product "Python" and version "3.5.1"		-		Affected