CVE-2016-10149

python-pysaml2: Entity expansion issue

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

XML External Entity (XXE) vulnerability in PySAML2 4.4.0 and earlier allows remote attackers to read arbitrary files via a crafted SAML XML request or response.

Vulnerabilidad de XXE en PySAML2 4.4.0 y versiones anteriores permite a atacantes remotos leer archivos arbitrarios a través de una solicitud o respuesta SAMPL XML manipulada.

An XML entity expansion vulnerability was found in python-pysaml2. A remote attacker could send a crafted request which would cause denial of service through resource exhaustion.

The defusedxml package contains several Python-only updates for security vulnerabilities in Python's XML libraries. Defusedxml functions and classes can be used instead of the originals to protect against entity-expansion and DTD-retrieval issues. PySAML2 is the python implementation of SAML Version 2, containing all the functionality for building a SAML2 service provider or an identity provider, to be used in a WSGI environment. Multiple security issues have been addressed.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-01-19 CVE Reserved
2017-03-24 CVE Published
2024-08-06 CVE Updated
2025-04-03 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-611: Improper Restriction of XML External Entity Reference
CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

CAPEC

References (12)

URL	Tag	Source
http://www.securityfocus.com/bid/97692	Vdb Entry

URL	Date	SRC

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2017/01/19/5	2018-01-05
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=850716	2018-01-05
https://github.com/rohe/pysaml2/commit/6e09a25d9b4b7aa7a506853210a9a14100b8bc9b	2018-01-05
https://github.com/rohe/pysaml2/issues/366	2018-01-05
https://github.com/rohe/pysaml2/pull/379	2018-01-05

URL	Date	SRC
http://www.debian.org/security/2017/dsa-3759	2018-01-05
https://access.redhat.com/errata/RHSA-2017:0936	2018-01-05
https://access.redhat.com/errata/RHSA-2017:0937	2018-01-05
https://access.redhat.com/errata/RHSA-2017:0938	2018-01-05
https://access.redhat.com/security/cve/CVE-2016-10149	2017-04-12
https://bugzilla.redhat.com/show_bug.cgi?id=1415710	2017-04-12

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Pysaml2 Project Search vendor "Pysaml2 Project"		Pysaml2 Search vendor "Pysaml2 Project" for product "Pysaml2"				<= 4.4.0 Search vendor "Pysaml2 Project" for product "Pysaml2" and version " <= 4.4.0"		-		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