The upstream patch for CVE-2014-8080 introduced checks against the REXML.entity_expansion_text_limit, but did not add restrictions to limit the number of expansions performed, i.e. checks against the REXML::Document.entity_expansion_limit. As a consequence, even with the patch applied, a small XML document could cause REXML to use an excessive amount of CPU time. High memory usage can be achieved using larger inputs.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2014-447.
#
include("compat.inc");
if (description)
{
script_id(79296);
script_version("1.6");
script_cvs_date("Date: 2018/04/18 15:09:35");
script_cve_id("CVE-2014-8090");
script_xref(name:"ALAS", value:"2014-447");
script_name(english:"Amazon Linux AMI : ruby19 (ALAS-2014-447)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote Amazon Linux AMI host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"The upstream patch for CVE-2014-8080 introduced checks against the
REXML.entity_expansion_text_limit, but did not add restrictions to
limit the number of expansions performed, i.e. checks against the
REXML::Document.entity_expansion_limit. As a consequence, even with
the patch applied, a small XML document could cause REXML to use an
excessive amount of CPU time. High memory usage can be achieved using
larger inputs."
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/ALAS-2014-447.html"
);
script_set_attribute(
attribute:"solution",
value:"Run 'yum update ruby19' to update your system."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby19");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby19-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby19-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby19-doc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby19-irb");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby19-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem19-bigdecimal");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem19-io-console");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem19-json");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem19-minitest");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem19-rake");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem19-rdoc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygems19");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygems19-devel");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
script_set_attribute(attribute:"patch_publication_date", value:"2014/11/13");
script_set_attribute(attribute:"plugin_publication_date", value:"2014/11/18");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2014-2018 Tenable Network Security, Inc.");
script_family(english:"Amazon Linux Local Security Checks");
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:"ruby19-1.9.3.551-32.64.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby19-debuginfo-1.9.3.551-32.64.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby19-devel-1.9.3.551-32.64.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby19-doc-1.9.3.551-32.64.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby19-irb-1.9.3.551-32.64.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby19-libs-1.9.3.551-32.64.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"rubygem19-bigdecimal-1.1.0-32.64.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"rubygem19-io-console-0.3-32.64.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"rubygem19-json-1.5.5-32.64.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"rubygem19-minitest-2.5.1-32.64.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"rubygem19-rake-0.9.2.2-32.64.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"rubygem19-rdoc-3.9.5-32.64.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"rubygems19-1.8.23.2-32.64.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"rubygems19-devel-1.8.23.2-32.64.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, "ruby19 / ruby19-debuginfo / ruby19-devel / ruby19-doc / ruby19-irb / etc");
}
Vendor | Product | Version | CPE |
---|---|---|---|
amazon | linux | ruby19 | p-cpe:/a:amazon:linux:ruby19 |
amazon | linux | ruby19-debuginfo | p-cpe:/a:amazon:linux:ruby19-debuginfo |
amazon | linux | ruby19-devel | p-cpe:/a:amazon:linux:ruby19-devel |
amazon | linux | ruby19-doc | p-cpe:/a:amazon:linux:ruby19-doc |
amazon | linux | ruby19-irb | p-cpe:/a:amazon:linux:ruby19-irb |
amazon | linux | ruby19-libs | p-cpe:/a:amazon:linux:ruby19-libs |
amazon | linux | rubygem19-bigdecimal | p-cpe:/a:amazon:linux:rubygem19-bigdecimal |
amazon | linux | rubygem19-io-console | p-cpe:/a:amazon:linux:rubygem19-io-console |
amazon | linux | rubygem19-json | p-cpe:/a:amazon:linux:rubygem19-json |
amazon | linux | rubygem19-minitest | p-cpe:/a:amazon:linux:rubygem19-minitest |