Vulnerabilities > CVE-2016-10149 - XXE vulnerability in multiple products

047910
CVSS 7.5 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
NONE
Availability impact
NONE
network
low complexity
pysaml2-project
debian
CWE-611
nessus

Summary

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.

Nessus

  • NASL familyUbuntu Local Security Checks
    NASL idUBUNTU_USN-3402-1.NASL
    descriptionIt was discovered that PySAML2 incorrectly handled certain SAML XML requests and responses. A remote attacker could use this issue to read arbitrary files. Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id102777
    published2017-08-25
    reporterUbuntu Security Notice (C) 2017-2019 Canonical, Inc. / NASL script (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/102777
    titleUbuntu 16.04 LTS / 17.04 : python-pysaml2 vulnerability (USN-3402-1)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were
    # extracted from Ubuntu Security Notice USN-3402-1. The text 
    # itself is copyright (C) Canonical, Inc. See 
    # <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
    # trademark of Canonical, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(102777);
      script_version("3.7");
      script_cvs_date("Date: 2019/09/18 12:31:47");
    
      script_cve_id("CVE-2016-10149");
      script_xref(name:"USN", value:"3402-1");
    
      script_name(english:"Ubuntu 16.04 LTS / 17.04 : python-pysaml2 vulnerability (USN-3402-1)");
      script_summary(english:"Checks dpkg output for updated packages.");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:
    "The remote Ubuntu host is missing one or more security-related
    patches."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "It was discovered that PySAML2 incorrectly handled certain SAML XML
    requests and responses. A remote attacker could use this issue to read
    arbitrary files.
    
    Note that Tenable Network Security has extracted the preceding
    description block directly from the Ubuntu security advisory. Tenable
    has attempted to automatically clean and format it as much as possible
    without introducing additional issues."
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://usn.ubuntu.com/3402-1/"
      );
      script_set_attribute(
        attribute:"solution", 
        value:"Update the affected python-pysaml2 and / or python3-pysaml2 packages."
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
      script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
      script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
      script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
      script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
      script_set_attribute(attribute:"exploit_available", value:"false");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python-pysaml2");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3-pysaml2");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:17.04");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2017/03/24");
      script_set_attribute(attribute:"patch_publication_date", value:"2017/08/24");
      script_set_attribute(attribute:"plugin_publication_date", value:"2017/08/25");
      script_set_attribute(attribute:"generated_plugin", value:"current");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"Ubuntu Security Notice (C) 2017-2019 Canonical, Inc. / NASL script (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
      script_family(english:"Ubuntu Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("ubuntu.inc");
    include("misc_func.inc");
    
    if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
    release = get_kb_item("Host/Ubuntu/release");
    if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
    release = chomp(release);
    if (! preg(pattern:"^(16\.04|17\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 16.04 / 17.04", "Ubuntu " + release);
    if ( ! get_kb_item("Host/Debian/dpkg-l") ) audit(AUDIT_PACKAGE_LIST_MISSING);
    
    cpu = get_kb_item("Host/cpu");
    if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
    if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Ubuntu", cpu);
    
    flag = 0;
    
    if (ubuntu_check(osver:"16.04", pkgname:"python-pysaml2", pkgver:"3.0.0-3ubuntu1.16.04.1")) flag++;
    if (ubuntu_check(osver:"16.04", pkgname:"python3-pysaml2", pkgver:"3.0.0-3ubuntu1.16.04.1")) flag++;
    if (ubuntu_check(osver:"17.04", pkgname:"python-pysaml2", pkgver:"3.0.0-3ubuntu1.17.04.1")) flag++;
    if (ubuntu_check(osver:"17.04", pkgname:"python3-pysaml2", pkgver:"3.0.0-3ubuntu1.17.04.1")) flag++;
    
    if (flag)
    {
      security_report_v4(
        port       : 0,
        severity   : SECURITY_WARNING,
        extra      : ubuntu_report_get()
      );
      exit(0);
    }
    else
    {
      tested = ubuntu_pkg_tests_get();
      if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
      else audit(AUDIT_PACKAGE_NOT_INSTALLED, "python-pysaml2 / python3-pysaml2");
    }
    
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-3759.NASL
    descriptionMatias 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.
    last seen2020-06-01
    modified2020-06-02
    plugin id96461
    published2017-01-13
    reporterThis script is Copyright (C) 2017-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/96461
    titleDebian DSA-3759-1 : python-pysaml2 - security update
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from Debian Security Advisory DSA-3759. The text 
    # itself is copyright (C) Software in the Public Interest, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(96461);
      script_version("3.10");
      script_cvs_date("Date: 2018/11/10 11:49:38");
    
      script_cve_id("CVE-2016-10127", "CVE-2016-10149");
      script_xref(name:"DSA", value:"3759");
    
      script_name(english:"Debian DSA-3759-1 : python-pysaml2 - security update");
      script_summary(english:"Checks dpkg output for the updated package");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote Debian host is missing a security-related update."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "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."
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=850716"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://packages.debian.org/source/jessie/python-pysaml2"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.debian.org/security/2017/dsa-3759"
      );
      script_set_attribute(
        attribute:"solution", 
        value:
    "Upgrade the python-pysaml2 packages.
    
    For the stable distribution (jessie), this problem has been fixed in
    version 2.0.0-1+deb8u1."
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
      script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
      script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H");
      script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
      script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
      script_set_attribute(attribute:"exploit_available", value:"false");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python-pysaml2");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");
    
      script_set_attribute(attribute:"patch_publication_date", value:"2017/01/12");
      script_set_attribute(attribute:"plugin_publication_date", value:"2017/01/13");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2017-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
      script_family(english:"Debian Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("debian_package.inc");
    
    
    if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
    if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
    if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);
    
    
    flag = 0;
    if (deb_check(release:"8.0", prefix:"python-pysaml2", reference:"2.0.0-1+deb8u1")) flag++;
    if (deb_check(release:"8.0", prefix:"python-pysaml2-doc", reference:"2.0.0-1+deb8u1")) flag++;
    
    if (flag)
    {
      if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
      else security_warning(0);
      exit(0);
    }
    else audit(AUDIT_HOST_NOT, "affected");
    

Redhat

advisories
  • rhsa
    idRHSA-2017:0936
  • rhsa
    idRHSA-2017:0937
  • rhsa
    idRHSA-2017:0938
rpms
  • python-defusedxml-0:0.5.0-1.el7ost
  • python-pysaml2-0:3.0.2-3.el7ost
  • python-defusedxml-0:0.5.0-1.el7ost
  • python-pysaml2-0:3.0.2-3.el7ost
  • python-defusedxml-0:0.5.0-1.el7ost
  • python-pysaml2-0:3.0.2-3.el7ost