A vulnerability was discovered that allows a man-in-the-middle attacker to use a padding oracle attack to decrypt traffic on a connection using an AES CBC cipher with a server supporting AES-NI.
(CVE-2016-2107 , Important)
It was discovered that the ASN.1 parser can misinterpret a large universal tag as a negative value. If an application deserializes and later reserializes untrusted ASN.1 structures containing an ANY field, an attacker may be able to trigger an out-of-bounds write, which can cause potentially exploitable memory corruption. (CVE-2016-2108 , Important)
An overflow bug was discovered in the EVP_EncodeUpdate() function. An attacker could supply very large amounts of input data to overflow a length check, resulting in heap corruption. (CVE-2016-2105 , Low)
An overflow bug was discovered in the EVP_EncryptUpdate() function. An attacker could supply very large amounts of input data to overflow a length check, resulting in heap corruption. (CVE-2016-2106 , Low)
An issue was discovered in the BIO functions, such as d2i_CMS_bio(), where a short invalid encoding in ASN.1 data can cause allocation of large amounts of memory, potentially resulting in a denial of service.
(CVE-2016-2109 , Low)
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2016-695.
#
include("compat.inc");
if (description)
{
script_id(90864);
script_version("2.8");
script_cvs_date("Date: 2019/04/11 17:23:06");
script_cve_id("CVE-2016-2105", "CVE-2016-2106", "CVE-2016-2107", "CVE-2016-2108", "CVE-2016-2109");
script_xref(name:"ALAS", value:"2016-695");
script_name(english:"Amazon Linux AMI : openssl (ALAS-2016-695)");
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:
"A vulnerability was discovered that allows a man-in-the-middle
attacker to use a padding oracle attack to decrypt traffic on a
connection using an AES CBC cipher with a server supporting AES-NI.
(CVE-2016-2107 , Important)
It was discovered that the ASN.1 parser can misinterpret a large
universal tag as a negative value. If an application deserializes and
later reserializes untrusted ASN.1 structures containing an ANY field,
an attacker may be able to trigger an out-of-bounds write, which can
cause potentially exploitable memory corruption. (CVE-2016-2108 ,
Important)
An overflow bug was discovered in the EVP_EncodeUpdate() function. An
attacker could supply very large amounts of input data to overflow a
length check, resulting in heap corruption. (CVE-2016-2105 , Low)
An overflow bug was discovered in the EVP_EncryptUpdate() function. An
attacker could supply very large amounts of input data to overflow a
length check, resulting in heap corruption. (CVE-2016-2106 , Low)
An issue was discovered in the BIO functions, such as d2i_CMS_bio(),
where a short invalid encoding in ASN.1 data can cause allocation of
large amounts of memory, potentially resulting in a denial of service.
(CVE-2016-2109 , Low)"
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/ALAS-2016-695.html"
);
script_set_attribute(
attribute:"solution",
value:"Run 'yum update openssl' to update your system."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
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:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:openssl");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:openssl-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:openssl-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:openssl-perl");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:openssl-static");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
script_set_attribute(attribute:"patch_publication_date", value:"2016/05/03");
script_set_attribute(attribute:"plugin_publication_date", value:"2016/05/04");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
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:"openssl-1.0.1k-14.91.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"openssl-debuginfo-1.0.1k-14.91.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"openssl-devel-1.0.1k-14.91.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"openssl-perl-1.0.1k-14.91.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"openssl-static-1.0.1k-14.91.amzn1")) flag++;
if (flag)
{
if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
else security_hole(0);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "openssl / openssl-debuginfo / openssl-devel / openssl-perl / etc");
}