openSUSE 16 Security Update : google-guest-agent (openSUSE-SU-2026:21069-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# openSUSE Security Update openSUSE-SU-2026:21069-1. The text itself
# is copyright (C) SUSE.
##

include('compat.inc');

if (description)
{
  script_id(324053);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/01");

  script_cve_id(
    "CVE-2026-33186",
    "CVE-2026-39821",
    "CVE-2026-39827",
    "CVE-2026-39828",
    "CVE-2026-39829",
    "CVE-2026-39830",
    "CVE-2026-39831",
    "CVE-2026-39832",
    "CVE-2026-39833",
    "CVE-2026-39834",
    "CVE-2026-39835",
    "CVE-2026-42508",
    "CVE-2026-46595",
    "CVE-2026-46597",
    "CVE-2026-46598"
  );

  script_name(english:"openSUSE 16 Security Update : google-guest-agent (openSUSE-SU-2026:21069-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote openSUSE host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the
openSUSE-SU-2026:21069-1 advisory.

    This update for google-guest-agent fixes the following issues

    - CVE-2026-33186: google.golang.org/grpc: authorization bypass due to improper validation of the HTTP/2
    :path pseudo-
      header (bsc#1260264).
    - CVE-2026-39821: golang.org/x/net/idna: failure to reject ASCII-only Punycode-encoded labels allows for
    validation
      bypass and privilege escalation (bsc#1266603).
    - CVE-2026-39827: Invoking memory leak when rejecting channels can lead to DoS in golang.org/x/crypto/ssh
    (bsc#1266171).
    - CVE-2026-39828: Invoking bypass of certificate restrictions in golang.org/x/crypto/ssh (bsc#1266171).
    - CVE-2026-39829: Invoking pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh
    (bsc#1266171).
    - CVE-2026-39830: Invoking client can cause server deadlock on unexpected responses in
    golang.org/x/crypto/ssh
      (bsc#1266171).
    - CVE-2026-39831: Invoking bypass of FIDO/U2F security keys physical interaction in
    golang.org/x/crypto/ssh
      (bsc#1266171).
    - CVE-2026-39832: Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent
      (bsc#1266171).
    - CVE-2026-39833: Invoking key constraints not enforced in golang.org/x/crypto/ssh/agent (bsc#1266171).
    - CVE-2026-39834: Invoking infinite loop on large channel writes in golang.org/x/crypto/ssh (bsc#1266171).
    - CVE-2026-39835: Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh
    (bsc#1266171).
    - CVE-2026-42508: Invoking auth bypass via unenforced @revoked status in
    golang.org/x/crypto/ssh/knownhosts
      (bsc#1266171).
    - CVE-2026-46595: Invoking VerifiedPublicKeyCallback permissions skip enforcement in
    golang.org/x/crypto/ssh
      (bsc#1266171).
    - CVE-2026-46597: Invoking byte arithmetic causes underflow and panic in golang.org/x/crypto/ssh
    (bsc#1266171).
    - CVE-2026-46598: Invoking pathological inputs can lead to client panic in golang.org/x/crypto/ssh/agent
    (bsc#1266171).

    Changes for google-guest-agent:

    - Update to version 20260529.00
     * Dependency updates (#616)
    - from version 20260522.00
     * Fix improper umask calculation on socket creation (#614)
    - from version 20260520.01
     * Update OWNERS (#609)
     * Bump google.golang.org/grpc from 1.75.0 to 1.79.3 (#602) (bsc#1260264, CVE-2026-33186)
    - Update to version 20250506.01 (bsc#1243254, bsc#1243505)

Tenable has extracted the preceding description block directly from the SUSE 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://bugzilla.suse.com/1243254");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1243505");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1260264");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1266171");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1266603");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-33186");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-39821");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-39827");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-39828");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-39829");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-39830");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-39831");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-39832");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-39833");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-39834");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-39835");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-42508");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-46595");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-46597");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-46598");
  script_set_attribute(attribute:"solution", value:
"Update the affected google-guest-agent package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/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:N/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-2026-46595");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-39834");

  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:"2026/03/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:google-guest-agent");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:16.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"SuSE 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/cpu", "Host/SuSE/release", "Host/SuSE/rpm-list");

  exit(0);
}


include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/SuSE/release');
if (isnull(os_release) || os_release =~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, 'openSUSE');
var _os_ver = pregmatch(pattern: "^SUSE([\d.]+)", string:os_release);
if (isnull(_os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'openSUSE');
_os_ver = _os_ver[1];
if (os_release !~ "^(SUSE16\.0)$") audit(AUDIT_OS_RELEASE_NOT, 'openSUSE', '16.0', os_release);
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'openSUSE ' + _os_ver, cpu);

var pkgs = [
    {'reference':'google-guest-agent-20260529.00-160000.1.1', 'release':'SUSE16.0', 'rpm_spec_vers_cmp':TRUE}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var reference = NULL;
  var _release = NULL;
  var _cpu = NULL;
  var rpm_spec_vers_cmp = 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['cpu'])) cpu = package_array['cpu'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (reference && _release) {
    if (rpm_check(release:_release, cpu:_cpu, reference:reference, rpm_spec_vers_cmp:rpm_spec_vers_cmp)) 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, 'google-guest-agent');
}