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.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2017:0937 advisory.

    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.

    Security Fix(es):

    * 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. (CVE-2016-10149)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2017:0936 advisory.

    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.

    Security Fix(es):

    * 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. (CVE-2016-10149)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-3402-1 advisory.

    It was discovered that PySAML2 incorrectly handled certain SAML XML requests and responses. A remote     attacker could use this issue to read arbitrary files.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Matias P. Brutti discovered that python-pysaml2, a Python implementation of the Security Assertion Markup Language 2.0, did not correctly sanitize the XML messages it handled. This allowed a remote attacker to perform XML External Entity attacks, leading to a wide range of exploits.

ID	Name	Product	Family	Severity
210223	RHEL 7 : python-defusedxml and python-pysaml2 (RHSA-2017:0937)	Nessus	Red Hat Local Security Checks	high
210176	RHEL 7 : python-defusedxml and python-pysaml2 (RHSA-2017:0936)	Nessus	Red Hat Local Security Checks	high
102777	Ubuntu 16.04 LTS : PySAML2 vulnerability (USN-3402-1)	Nessus	Ubuntu Local Security Checks	high
96461	Debian DSA-3759-1 : python-pysaml2 - security update	Nessus	Debian Local Security Checks	critical

Detections

Analytics

CVE-2016-10149

high

Tenable Plugins

high

high

high

critical