Amazon Linux 2 : python (ALAS-2020-1432)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2020-1432.
#

include('compat.inc');

if (description)
{
  script_id(137089);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/08");

  script_cve_id("CVE-2018-20852", "CVE-2020-8492");
  script_xref(name:"ALAS", value:"2020-1432");

  script_name(english:"Amazon Linux 2 : python (ALAS-2020-1432)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"http.cookiejar.DefaultPolicy.domain_return_ok in Lib/http/cookiejar.py
in Python before 3.7.3 does not correctly validate the domain: it can
be tricked into sending existing cookies to the wrong server. An
attacker may abuse this flaw by using a server with a hostname that
has another valid hostname as a suffix (e.g., pythonicexample.com to
steal cookies for example.com). When a program uses
http.cookiejar.DefaultPolicy and tries to do an HTTP connection to an
attacker-controlled server, existing cookies can be leaked to the
attacker. This affects 2.x through 2.7.16, 3.x before 3.4.10, 3.5.x
before 3.5.7, 3.6.x before 3.6.9, and 3.7.x before
3.7.3.(CVE-2018-20852)

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7
through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct
Regular Expression Denial of Service (ReDoS) attacks against a client
because of urllib.request.AbstractBasicAuthHandler catastrophic
backtracking.(CVE-2020-8492)");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/AL2/ALAS-2020-1432.html");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update python' to update your system.");
  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:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-20852");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/07/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/06/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/06/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tkinter");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Amazon Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/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);

release = get_kb_item("Host/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "2")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (rpm_check(release:"AL2", reference:"python-2.7.18-1.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"python-debug-2.7.18-1.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"python-debuginfo-2.7.18-1.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"python-devel-2.7.18-1.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"python-libs-2.7.18-1.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"python-test-2.7.18-1.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"python-tools-2.7.18-1.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"tkinter-2.7.18-1.amzn2")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "python / python-debug / python-debuginfo / python-devel / etc");
}