CVE-2017-9233

Apple Security Advisory 2017-10-31-8

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

XML External Entity vulnerability in libexpat 2.2.0 and earlier (Expat XML Parser Library) allows attackers to put the parser in an infinite loop using a malformed external entity definition from an external DTD.

Una vulnerabilidad de XML External Entity (XEE) en libexpat versión 2.2.0 y anteriores (Expat XML Parser Library) permite que los atacantes consigan que el analizador entre en un bucle infinito utilizando una definición de entidad externa mal formada desde una DTD externa.

It was discovered that Expat incorrectly handled certain external entities. A remote attacker could possibly use this issue to cause Expat to hang, resulting in a denial of service.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-05-26 CVE Reserved
2017-07-19 CVE Published
2024-08-05 CVE Updated
2024-08-05 First Exploit
2025-04-15 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-611: Improper Restriction of XML External Entity Reference
CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

CAPEC

References (13)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2017/06/17/7	Mailing List
http://www.securityfocus.com/bid/99276	Third Party Advisory
http://www.securitytracker.com/id/1039427	Third Party Advisory
https://github.com/libexpat/libexpat/blob/master/expat/Changes	Release Notes
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E	Mailing List
https://support.apple.com/HT208112	Third Party Advisory
https://support.apple.com/HT208113	Third Party Advisory
https://support.apple.com/HT208115	Third Party Advisory
https://support.apple.com/HT208144	Third Party Advisory
https://support.f5.com/csp/article/K03244804	Third Party Advisory

URL	Date	SRC
https://libexpat.github.io/doc/cve-2017-9233	2024-08-05

URL	Date	SRC

URL	Date	SRC
http://www.debian.org/security/2017/dsa-3898	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Libexpat Project Search vendor "Libexpat Project"		Libexpat Search vendor "Libexpat Project" for product "Libexpat"				<= 2.2.0 Search vendor "Libexpat Project" for product "Libexpat" and version " <= 2.2.0"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 2.7.0 < 2.7.15 Search vendor "Python" for product "Python" and version " >= 2.7.0 < 2.7.15"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.3.0 < 3.3.7 Search vendor "Python" for product "Python" and version " >= 3.3.0 < 3.3.7"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.4.0 < 3.4.7 Search vendor "Python" for product "Python" and version " >= 3.4.0 < 3.4.7"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.5.0 < 3.5.4 Search vendor "Python" for product "Python" and version " >= 3.5.0 < 3.5.4"		-		Affected
Python Search vendor "Python"		Python Search vendor "Python" for product "Python"				>= 3.6.0 < 3.6.2 Search vendor "Python" for product "Python" and version " >= 3.6.0 < 3.6.2"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected