CVSS2
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
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
Confidence
High
EPSS
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
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
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
Confidence
High
EPSS
Percentile
79.3%