Amazon Linux AMI : curl (ALAS-2016-730)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2016-730.
#

include("compat.inc");

if (description)
{
  script_id(93008);
  script_version("2.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/11");

  script_cve_id("CVE-2016-5419", "CVE-2016-5420", "CVE-2016-5421");
  script_xref(name:"ALAS", value:"2016-730");

  script_name(english:"Amazon Linux AMI : curl (ALAS-2016-730)");
  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:
"curl and libcurl before 7.50.1 do not prevent TLS session resumption
when the client certificate has changed, which allows remote attackers
to bypass intended restrictions by resuming a session. (CVE-2016-5419)

curl and libcurl before 7.50.1 do not check the client certificate
when choosing the TLS connection to reuse, which might allow remote
attackers to hijack the authentication of the connection by leveraging
a previously created connection with a different client certificate.
(CVE-2016-5420)

libcurl before 7.50.1 allows attackers to control which connection is
used or possibly have unspecified other impact via unknown vectors.
(CVE-2016-5421)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/ALAS-2016-730.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Run 'yum update curl' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:curl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:curl-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libcurl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libcurl-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/08/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/08/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/08/18");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2020 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:"curl-7.40.0-8.59.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"curl-debuginfo-7.40.0-8.59.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"libcurl-7.40.0-8.59.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"libcurl-devel-7.40.0-8.59.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, "curl / curl-debuginfo / libcurl / libcurl-devel");
}