Amazon Linux 2 : golang (ALAS-2022-1830)

##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2022-1830.
##

include('compat.inc');

if (description)
{
  script_id(163918);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/08");

  script_cve_id(
    "CVE-2020-29652",
    "CVE-2021-27918",
    "CVE-2021-27919",
    "CVE-2021-33195",
    "CVE-2021-33197",
    "CVE-2021-33198",
    "CVE-2021-36221",
    "CVE-2021-38297",
    "CVE-2021-39293",
    "CVE-2022-23772",
    "CVE-2022-23773",
    "CVE-2022-23806",
    "CVE-2022-24675",
    "CVE-2022-24921",
    "CVE-2022-28327"
  );
  script_xref(name:"IAVB", value:"2021-B-0040-S");
  script_xref(name:"IAVB", value:"2022-B-0008-S");
  script_xref(name:"IAVB", value:"2022-B-0011-S");
  script_xref(name:"IAVB", value:"2021-B-0069-S");
  script_xref(name:"IAVB", value:"2023-B-0080-S");

  script_name(english:"Amazon Linux 2 : golang (ALAS-2022-1830)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The version of golang installed on the remote host is prior to 1.18.3-1. It is, therefore, affected by multiple
vulnerabilities as referenced in the ALAS2-2022-1830 advisory.

  - A nil pointer dereference in the golang.org/x/crypto/ssh component through
    v0.0.0-20201203163018-be400aefbc4c for Go allows remote attackers to cause a denial of service against SSH
    servers. (CVE-2020-29652)

  - encoding/xml in Go before 1.15.9 and 1.16.x before 1.16.1 has an infinite loop if a custom TokenReader
    (for xml.NewTokenDecoder) returns EOF in the middle of an element. This can occur in the Decode,
    DecodeElement, or Skip method. (CVE-2021-27918)

  - archive/zip in Go 1.16.x before 1.16.1 allows attackers to cause a denial of service (panic) upon
    attempted use of the Reader.Open API for a ZIP archive in which ../ occurs at the beginning of any
    filename. (CVE-2021-27919)

  - Go before 1.15.13 and 1.16.x before 1.16.5 has functions for DNS lookups that do not validate replies from
    DNS servers, and thus a return value may contain an unsafe injection (e.g., XSS) that does not conform to
    the RFC1035 format. (CVE-2021-33195)

  - In Go before 1.15.13 and 1.16.x before 1.16.5, some configurations of ReverseProxy (from
    net/http/httputil) result in a situation where an attacker is able to drop arbitrary headers.
    (CVE-2021-33197)

  - In Go before 1.15.13 and 1.16.x before 1.16.5, there can be a panic for a large exponent to the
    math/big.Rat SetString or UnmarshalText method. (CVE-2021-33198)

  - Go before 1.15.15 and 1.16.x before 1.16.7 has a race condition that can lead to a net/http/httputil
    ReverseProxy panic upon an ErrAbortHandler abort. (CVE-2021-36221)

  - Go before 1.16.9 and 1.17.x before 1.17.2 has a Buffer Overflow via large arguments in a function
    invocation from a WASM module, when GOARCH=wasm GOOS=js is used. (CVE-2021-38297)

  - In archive/zip in Go before 1.16.8 and 1.17.x before 1.17.1, a crafted archive header (falsely designating
    that many files are present) can cause a NewReader or OpenReader panic. NOTE: this issue exists because of
    an incomplete fix for CVE-2021-33196. (CVE-2021-39293)

  - Rat.SetString in math/big in Go before 1.16.14 and 1.17.x before 1.17.7 has an overflow that can lead to
    Uncontrolled Memory Consumption. (CVE-2022-23772)

  - cmd/go in Go before 1.16.14 and 1.17.x before 1.17.7 can misinterpret branch names that falsely appear to
    be version tags. This can lead to incorrect access control if an actor is supposed to be able to create
    branches but not tags. (CVE-2022-23773)

  - Curve.IsOnCurve in crypto/elliptic in Go before 1.16.14 and 1.17.x before 1.17.7 can incorrectly return
    true in situations with a big.Int value that is not a valid field element. (CVE-2022-23806)

  - encoding/pem in Go before 1.17.9 and 1.18.x before 1.18.1 has a Decode stack overflow via a large amount
    of PEM data. (CVE-2022-24675)

  - regexp.Compile in Go before 1.16.15 and 1.17.x before 1.17.8 allows stack exhaustion via a deeply nested
    expression. (CVE-2022-24921)

  - The generic P-256 feature in crypto/elliptic in Go before 1.17.9 and 1.18.x before 1.18.1 allows a panic
    via long scalar input. (CVE-2022-28327)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/AL2/ALAS-2022-1830.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2020-29652.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-27918.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-27919.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-33195.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-33197.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-33198.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-36221.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-38297.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-39293.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-23772.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-23773.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-23806.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-24675.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-24921.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-28327.html");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update golang' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  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:"cvss_score_source", value:"CVE-2021-38297");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/12/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/07/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/08/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:golang");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:golang-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:golang-docs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:golang-misc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:golang-race");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:golang-shared");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:golang-src");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:golang-tests");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Amazon Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2022-2023 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("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var release = get_kb_item("Host/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
var os_ver = os_ver[1];
if (os_ver != "2")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

var pkgs = [
    {'reference':'golang-1.18.3-1.amzn2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'golang-1.18.3-1.amzn2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'golang-bin-1.18.3-1.amzn2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'golang-bin-1.18.3-1.amzn2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'golang-docs-1.18.3-1.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'golang-misc-1.18.3-1.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'golang-race-1.18.3-1.amzn2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'golang-shared-1.18.3-1.amzn2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'golang-shared-1.18.3-1.amzn2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'golang-src-1.18.3-1.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'golang-tests-1.18.3-1.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var reference = NULL;
  var release = NULL;
  var sp = NULL;
  var cpu = NULL;
  var el_string = NULL;
  var rpm_spec_vers_cmp = NULL;
  var epoch = NULL;
  var allowmaj = NULL;
  var exists_check = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) release = package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (reference && release && (!exists_check || rpm_exists(release:release, rpm:exists_check))) {
    if (rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "golang / golang-bin / golang-docs / etc");
}