CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
Percentile
73.1%
IV Reuse in GCM Mode :
The openssl gem for Ruby uses the same initialization vector (IV) in GCM Mode (aes-*-gcm) when the IV is set before the key, which makes it easier for context-dependent attackers to bypass the encryption protection mechanism. (CVE-2016-7798)
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2017-880.
#
include("compat.inc");
if (description)
{
script_id(102868);
script_version("3.3");
script_cvs_date("Date: 2018/04/18 15:09:36");
script_cve_id("CVE-2016-7798");
script_xref(name:"ALAS", value:"2017-880");
script_name(english:"Amazon Linux AMI : ruby23 (ALAS-2017-880)");
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:
"IV Reuse in GCM Mode :
The openssl gem for Ruby uses the same initialization vector (IV) in
GCM Mode (aes-*-gcm) when the IV is set before the key, which makes it
easier for context-dependent attackers to bypass the encryption
protection mechanism. (CVE-2016-7798)"
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/ALAS-2017-880.html"
);
script_set_attribute(
attribute:"solution",
value:"Run 'yum update ruby23' to update your system."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby23");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby23-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby23-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby23-doc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby23-irb");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby23-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem23-bigdecimal");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem23-did_you_mean");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem23-io-console");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem23-psych");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygems23");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygems23-devel");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
script_set_attribute(attribute:"patch_publication_date", value:"2017/08/31");
script_set_attribute(attribute:"plugin_publication_date", value:"2017/09/01");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2017-2018 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:"ruby23-2.3.4-1.15.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby23-debuginfo-2.3.4-1.15.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby23-devel-2.3.4-1.15.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby23-doc-2.3.4-1.15.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby23-irb-2.3.4-1.15.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"ruby23-libs-2.3.4-1.15.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"rubygem23-bigdecimal-1.2.8-1.15.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"rubygem23-did_you_mean-1.0.0-1.15.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"rubygem23-io-console-0.4.5-1.15.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"rubygem23-psych-2.1.0-1.15.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"rubygems23-2.5.2-1.15.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"rubygems23-devel-2.5.2-1.15.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, "ruby23 / ruby23-debuginfo / ruby23-devel / ruby23-doc / ruby23-irb / etc");
}
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
Percentile
73.1%