Amazon Linux 2 : resteasy-base (ALAS-2026-3936)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2026-3936.
##

include('compat.inc');

if (description)
{
  script_id(351066);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/29");

  script_cve_id("CVE-2026-17615");

  script_name(english:"Amazon Linux 2 : resteasy-base (ALAS-2026-3936)");

  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 resteasy-base installed on the remote host is prior to 3.0.6-4. It is, therefore, affected by a
vulnerability as referenced in the ALAS2-2026-3936 advisory.

    A flaw was found in RESTEasy's SourceProvider. This vulnerability allows an unauthenticated attacker to
    perform an unauthenticated remote file read. By sending a specially crafted XML body with a DOCTYPE
    declaration referencing external entities to an endpoint that accepts application/xml and returns Source
    or StreamSource, the server can be tricked into resolving the entity and including sensitive file contents
    in the HTTP response. This is due to the SourceProvider.writeTo() method creating a SAXParser without
    disabling external entity resolution, leading to an XML External Entity (XXE) vulnerability.
    (CVE-2026-17615)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue 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/ALAS2-2026-3936.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-17615.html");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update resteasy-base' or
  or 'yum update --advisory ALAS2-2026-3936' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/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:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-17615");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/31");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:resteasy-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:resteasy-base-atom-provider");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:resteasy-base-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:resteasy-base-jackson-provider");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:resteasy-base-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:resteasy-base-jaxb-provider");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:resteasy-base-jaxrs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:resteasy-base-jaxrs-all");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:resteasy-base-jaxrs-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:resteasy-base-jettison-provider");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:resteasy-base-providers-pom");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:resteasy-base-resteasy-pom");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:resteasy-base-tjws");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2026 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("rpm2.inc");

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

var alas_release = get_kb_item("Host/AmazonLinux/release");
if (isnull(alas_release) || !strlen(alas_release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d+|-\d+)", string:alas_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
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':'resteasy-base-3.0.6-4.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'resteasy-base-atom-provider-3.0.6-4.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'resteasy-base-client-3.0.6-4.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'resteasy-base-jackson-provider-3.0.6-4.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'resteasy-base-javadoc-3.0.6-4.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'resteasy-base-jaxb-provider-3.0.6-4.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'resteasy-base-jaxrs-3.0.6-4.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'resteasy-base-jaxrs-all-3.0.6-4.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'resteasy-base-jaxrs-api-3.0.6-4.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'resteasy-base-jettison-provider-3.0.6-4.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'resteasy-base-providers-pom-3.0.6-4.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'resteasy-base-resteasy-pom-3.0.6-4.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'resteasy-base-tjws-3.0.6-4.amzn2.0.2', '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;
  var cves = 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 (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  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, cves:cves)) 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, "resteasy-base / resteasy-base-atom-provider / resteasy-base-client / etc");
}