ModelScope MS-Agent 1.5.1 < 1.6.0 Command Injection (CVE-2026-2256)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(365564);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/15");

  script_cve_id("CVE-2026-2256");

  script_name(english:"ModelScope MS-Agent 1.5.1 < 1.6.0 Command Injection (CVE-2026-2256)");

  script_set_attribute(attribute:"synopsis", value:
"The ModelScope MS-Agent library installed on the remote host is affected by a command injection vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of ModelScope MS-Agent installed on the remote host is 1.5.1 or later but prior to 1.6.0. It is, therefore,
affected by a command injection vulnerability. The Shell tool runs commands on the host through a shell, guarded only
by a regex denylist that can be bypassed, allowing an attacker to execute arbitrary operating system commands through
crafted prompt-derived input. (CVE-2026-2256)

Note that although the advisory lists versions 1.6.0rc1 and earlier as affected, the vulnerable Shell tool was first
introduced in version 1.5.1. Versions prior to 1.5.1, including the legacy modelscope-agent package, do not contain it
and are not affected.

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://github.com/advisories/GHSA-4gc2-344q-r2rw");
  script_set_attribute(attribute:"see_also", value:"https://github.com/modelscope/ms-agent/pull/880");
  script_set_attribute(attribute:"see_also", value:"https://github.com/modelscope/ms-agent/releases/tag/v1.6.0");
  script_set_attribute(attribute:"solution", value:
"Upgrade to ModelScope MS-Agent version 1.6.0 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/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:L/I:L/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-2026-2256");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(77, 94);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/03/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:modelscope:ms-agent");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Artificial Intelligence");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ms_agent_nix_installed.nbin", "ms_agent_win_installed.nbin");
  script_require_keys("installed_sw/ModelScope MS-Agent");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'ModelScope MS-Agent', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {
          'min_version': '1.5.1',
          'fixed_version': '1.6.0'
        }
      ]
    }
  ]
};

var result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_WARNING);
vdf::handle_check_and_report_errors(vdf_result:result);