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nessusThis script is Copyright (C) 2018-2024 and is owned by Tenable, Inc. or an Affiliate thereof.ALA_ALAS-2018-1132.NASL
HistoryDec 21, 2018 - 12:00 a.m.

Amazon Linux AMI : python34 / python36 (ALAS-2018-1132)

2018-12-2100:00:00
This script is Copyright (C) 2018-2024 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
43
amazon linux
python
security update
cve-2018-14647
denial of service

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

AI Score

7.3

Confidence

High

EPSS

0.006

Percentile

79.3%

Python’s elementtree C accelerator failed to initialise Expat’s hash salt during initialization. This could make it easy to conduct denial of service attacks against Expat by contructing an XML document that would cause pathological hash collisions in Expat’s internal data structures, consuming large amounts CPU and RAM.(CVE-2018-14647)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2018-1132.
#

include('compat.inc');

if (description)
{
  script_id(119812);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/07/15");

  script_cve_id("CVE-2018-14647");
  script_xref(name:"ALAS", value:"2018-1132");

  script_name(english:"Amazon Linux AMI : python34 / python36 (ALAS-2018-1132)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux AMI host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"Python's elementtree C accelerator failed to initialise Expat's hash
salt during initialization. This could make it easy to conduct denial
of service attacks against Expat by contructing an XML document that
would cause pathological hash collisions in Expat's internal data
structures, consuming large amounts CPU and RAM.(CVE-2018-14647)");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/ALAS-2018-1132.html");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update python34' to update your system.

Run 'yum update python36' to update your system.");
  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_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-14647");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/09/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/01/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/12/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python34");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python34-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python34-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python34-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python34-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python34-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python36");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python36-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python36-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python36-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python36-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python36-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python36-tools");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
  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) 2018-2024 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 != "A")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}

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


flag = 0;
if (rpm_check(release:"ALA", reference:"python34-3.4.9-1.40.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"python34-debuginfo-3.4.9-1.40.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"python34-devel-3.4.9-1.40.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"python34-libs-3.4.9-1.40.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"python34-test-3.4.9-1.40.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"python34-tools-3.4.9-1.40.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"python36-3.6.7-1.10.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"python36-debug-3.6.7-1.10.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"python36-debuginfo-3.6.7-1.10.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"python36-devel-3.6.7-1.10.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"python36-libs-3.6.7-1.10.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"python36-test-3.6.7-1.10.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"python36-tools-3.6.7-1.10.amzn1")) 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, "python34 / python34-debuginfo / python34-devel / python34-libs / etc");
}

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

AI Score

7.3

Confidence

High

EPSS

0.006

Percentile

79.3%