Amazon Linux 2 : runfinch-finch (ALASDOCKER-2026-151)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALASDOCKER-2026-151.
##

include('compat.inc');

if (description)
{
  script_id(371810);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/24");

  script_cve_id(
    "CVE-2026-78659",
    "CVE-2026-93316",
    "CVE-2026-93317",
    "CVE-2026-93318",
    "CVE-2026-93319",
    "CVE-2026-93320",
    "CVE-2026-93321",
    "CVE-2026-93322"
  );
  script_xref(name:"IAVB", value:"2026-B-0296-S");

  script_name(english:"Amazon Linux 2 : runfinch-finch (ALASDOCKER-2026-151)");

  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 runfinch-finch installed on the remote host is prior to 1.19.0-1. It is, therefore, affected by multiple
vulnerabilities as referenced in the ALAS2DOCKER-2026-151 advisory.

    When Trailer headers are sent by a client, the HTTP server internally uses the header values to populate
    the Request.Trailer map passed to the server handler. Because Request.Trailer is a map, each entry incurs
    memory overhead. For HTTP/2 servers, a malicious client can exploit this by sending a Trailer header
    that declares a large number of fields causing the server to allocate a disproportionate amount of memory
    while bypassing Server.MaxHeaderValueCount and Server.MaxHeaderBytes limits.This exploit is not applicable
    for HTTP/1 servers, which do not support  multiplexing a large number of requests over one TCP connection,
    and whose Server.MaxHeaderBytes are calculated differently.Server.MaxHeaderValueCount and
    Server.MaxHeaderBytes limits are now applied towards the trailer fields declared in Trailer headers.

    NOTE: https://www.openwall.com/lists/oss-security/2026/10/08/9NOTE:
    https://github.com/golang/go/issues/81857NOTE: Fixed by:
    https://github.com/golang/go/commit/cbb0fb8b51cba866018b8a0fb4b5458f16c5c80b (go1.27.2)NOTE: Fixed by:
    https://github.com/golang/go/commit/6e049521882c944afc1e519a83971ec421dc2974 (go1.26.9) (CVE-2026-78659)

    If BuildKit daemon is started with --cdi-disabled it can lead to daemon panic when builds try to use CDI
    devices. This can happen maliciously or by accident. (CVE-2026-93316)

    An unauthenticated attacker controlling a registry or OCI-layout blob source could provide blob contents
    that did not match the claimed digest. The resulting snapshot could be cached under that digest and reused
    by a later victim build, compromising build-input integrity. (CVE-2026-93317)

    A malicious image can advertise DiffIDs from another image while containing different layer contents. In
    affected versions, BuildKit could use the advertised DiffIDs to derive cache and snapshot identity without
    validating that they matched the actual layer contents.

    If a BuildKit daemon with shared or persistent cache first processes such a malicious image, a later build
    using the victim image may mount the attacker-controlled layer contents as the base image. This can allow
    code from the malicious image to run in the victim build, for example by replacing a commonly executed
    path such as /bin/sh. The attacker-controlled code may read build secrets mounted into the build, access
    other build resources, alter output artifacts, or hang the build.

    The issue affects both regular snapshotters and lazy-pulling snapshotters such as stargz. (CVE-2026-93318)

    A malicious external BuildKit frontend can send requests using the internal API that can create conditions
    for a data race that can cause the BuildKit daemon to panic. (CVE-2026-93319)

    BuildKit may be tricked into performing file actions with special file inodes where regular files are
    expected. Special files may block operations or, on rootful workers, allow unintended host device access.
    (CVE-2026-93320)

    A malicious frontend can submit an LLB definition that causes buildkitdto panic and terminate,
    interrupting all builds running on that daemon. (CVE-2026-93321)

    A malicious frontend can submit an LLB definition that causes buildkitdto panic and terminate,
    interrupting all builds running on that daemon. (CVE-2026-93322)

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

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/ALAS2DOCKER-2026-151.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-2026-78659.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-93316.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-93317.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-93318.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-93319.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-93320.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-93321.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-93322.html");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update runfinch-finch' or
  or 'yum update --advisory ALAS2DOCKER-2026-151' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  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:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-78659");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-93318");

  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:"2026/10/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:runfinch-finch");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  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) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.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 REPOS_FOUND = TRUE;
var extras_list = get_kb_item("Host/AmazonLinux/extras_label_list");
if (isnull(extras_list)) REPOS_FOUND = FALSE;
var repository = '"amzn2extra-docker"';
if (REPOS_FOUND && (repository >!< extras_list)) exit(0, AFFECTED_REPO_NOT_ENABLED);

var pkgs = [
    {'reference':'runfinch-finch-1.19.0-1.amzn2.0.2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'runfinch-finch-1.19.0-1.amzn2.0.2', 'cpu':'x86_64', '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)
{
  var extra = rpm_report_get();
  if (!REPOS_FOUND) extra = rpm_report_get() + report_repo_caveat();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "runfinch-finch");
}