CentOS 6 : python (CESA-2012:0744)

2012-06-20T00:00:00
ID CENTOS_RHSA-2012-0744.NASL
Type nessus
Reporter Tenable
Modified 2018-07-02T00:00:00

Description

Updated python packages that fix multiple security issues are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

Python is an interpreted, interactive, object-oriented programming language.

A denial of service flaw was found in the implementation of associative arrays (dictionaries) in Python. An attacker able to supply a large number of inputs to a Python application (such as HTTP POST request parameters sent to a web application) that are used as keys when inserting data into an array could trigger multiple hash function collisions, making array operations take an excessive amount of CPU time. To mitigate this issue, randomization has been added to the hash function to reduce the chance of an attacker successfully causing intentional collisions. (CVE-2012-1150)

Note: The hash randomization is not enabled by default as it may break applications that incorrectly depend on dictionary ordering. To enable the protection, the new 'PYTHONHASHSEED' environment variable or the Python interpreter's '-R' command line option can be used. Refer to the python(1) manual page for details.

The RHSA-2012:0731 expat erratum must be installed with this update, which adds hash randomization to the Expat library used by the Python pyexpat module.

A flaw was found in the way the Python SimpleXMLRPCServer module handled clients disconnecting prematurely. A remote attacker could use this flaw to cause excessive CPU consumption on a server using SimpleXMLRPCServer. (CVE-2012-0845)

A flaw was found in the way the Python SimpleHTTPServer module generated directory listings. An attacker able to upload a file with a specially crafted name to a server could possibly perform a cross-site scripting (XSS) attack against victims visiting a listing page generated by SimpleHTTPServer, for a directory containing the crafted file (if the victims were using certain web browsers). (CVE-2011-4940)

A race condition was found in the way the Python distutils module set file permissions during the creation of the .pypirc file. If a local user had access to the home directory of another user who is running distutils, they could use this flaw to gain access to that user's .pypirc file, which can contain usernames and passwords for code repositories. (CVE-2011-4944)

Red Hat would like to thank oCERT for reporting CVE-2012-1150. oCERT acknowledges Julian Walde and Alexander Klink as the original reporters of CVE-2012-1150.

All Python users should upgrade to these updated packages, which contain backported patches to correct these issues.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2012:0744 and 
# CentOS Errata and Security Advisory 2012:0744 respectively.
#

if (NASL_LEVEL < 3000) exit(0);

include("compat.inc");

if (description)
{
  script_id(59570);
  script_version("1.9");
  script_cvs_date("Date: 2018/07/02 18:48:52");

  script_cve_id("CVE-2011-4940", "CVE-2011-4944", "CVE-2012-0845", "CVE-2012-1150");
  script_bugtraq_id(51239, 51996, 52732);
  script_xref(name:"RHSA", value:"2012:0744");

  script_name(english:"CentOS 6 : python (CESA-2012:0744)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Updated python packages that fix multiple security issues are now
available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having
moderate security impact. Common Vulnerability Scoring System (CVSS)
base scores, which give detailed severity ratings, are available for
each vulnerability from the CVE links in the References section.

Python is an interpreted, interactive, object-oriented programming
language.

A denial of service flaw was found in the implementation of
associative arrays (dictionaries) in Python. An attacker able to
supply a large number of inputs to a Python application (such as HTTP
POST request parameters sent to a web application) that are used as
keys when inserting data into an array could trigger multiple hash
function collisions, making array operations take an excessive amount
of CPU time. To mitigate this issue, randomization has been added to
the hash function to reduce the chance of an attacker successfully
causing intentional collisions. (CVE-2012-1150)

Note: The hash randomization is not enabled by default as it may break
applications that incorrectly depend on dictionary ordering. To enable
the protection, the new 'PYTHONHASHSEED' environment variable or the
Python interpreter's '-R' command line option can be used. Refer to
the python(1) manual page for details.

The RHSA-2012:0731 expat erratum must be installed with this update,
which adds hash randomization to the Expat library used by the Python
pyexpat module.

A flaw was found in the way the Python SimpleXMLRPCServer module
handled clients disconnecting prematurely. A remote attacker could use
this flaw to cause excessive CPU consumption on a server using
SimpleXMLRPCServer. (CVE-2012-0845)

A flaw was found in the way the Python SimpleHTTPServer module
generated directory listings. An attacker able to upload a file with a
specially crafted name to a server could possibly perform a cross-site
scripting (XSS) attack against victims visiting a listing page
generated by SimpleHTTPServer, for a directory containing the crafted
file (if the victims were using certain web browsers). (CVE-2011-4940)

A race condition was found in the way the Python distutils module set
file permissions during the creation of the .pypirc file. If a local
user had access to the home directory of another user who is running
distutils, they could use this flaw to gain access to that user's
.pypirc file, which can contain usernames and passwords for code
repositories. (CVE-2011-4944)

Red Hat would like to thank oCERT for reporting CVE-2012-1150. oCERT
acknowledges Julian Walde and Alexander Klink as the original
reporters of CVE-2012-1150.

All Python users should upgrade to these updated packages, which
contain backported patches to correct these issues."
  );
  # http://lists.centos.org/pipermail/centos-announce/2012-June/018693.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?8cfa9a48"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected python packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/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:centos:centos:python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tkinter");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:6");

  script_set_attribute(attribute:"plugin_publication_date", value:"2012/06/20");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2012-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"CentOS Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/CentOS/release")) audit(AUDIT_OS_NOT, "CentOS");
if (!get_kb_item("Host/CentOS/rpm-list")) 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, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-6", reference:"python-2.6.6-29.el6_2.2")) flag++;
if (rpm_check(release:"CentOS-6", reference:"python-devel-2.6.6-29.el6_2.2")) flag++;
if (rpm_check(release:"CentOS-6", reference:"python-libs-2.6.6-29.el6_2.2")) flag++;
if (rpm_check(release:"CentOS-6", reference:"python-test-2.6.6-29.el6_2.2")) flag++;
if (rpm_check(release:"CentOS-6", reference:"python-tools-2.6.6-29.el6_2.2")) flag++;
if (rpm_check(release:"CentOS-6", reference:"tkinter-2.6.6-29.el6_2.2")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");