Erlang/OTP (Erlang OTP) DoS Vulnerability (Mar 2025) - Linux

# SPDX-FileCopyrightText: 2025 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/a:erlang:erlang%2fotp";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.105299");
  script_version("2025-04-25T15:41:53+0000");
  script_tag(name:"last_modification", value:"2025-04-25 15:41:53 +0000 (Fri, 25 Apr 2025)");
  script_tag(name:"creation_date", value:"2025-04-25 11:58:37 +0000 (Fri, 25 Apr 2025)");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_cve_id("CVE-2025-30211");
  script_name("Erlang/OTP (Erlang OTP) DoS Vulnerability (Mar 2025) - Linux");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2025 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_erlang_otp_ssh_banner_detect.nasl", "os_detection.nasl");
  script_mandatory_keys("erlang/otp/detected", "Host/runs_unixoide");

  script_xref(name:"URL", value:"https://github.com/erlang/otp/security/advisories/GHSA-vvr3-fjhh-cfwc");

  script_tag(name:"summary", value:"Erlang/OTP (Erlang OTP) is prone to a denial of service (DoS)
  vulnerability in the SSH component.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"insight", value:"- Maliciously formed KEX init message can result with high
  memory usage.

  - Implementation does not verify RFC specified limits on algorithm names (64 characters) provided
  in KEX init message.");

  script_tag(name:"impact", value:"Big KEX init packet may lead to inefficient processing of the
  error data. As a result, large amount of memory will be allocated for processing malicious
  data.");

  script_tag(name:"affected", value:"Erlang/OTP (Erlang OTP) versions prior to 25.3.2.19, 26.x prior
  to 26.2.5.10 and 27.x prior to 27.3.1.");

  script_tag(name:"solution", value:"Update to version 25.3.2.19, 26.2.5.10, 27.3.1 or later.");

  script_tag(name:"qod_type", value:"remote_banner_unreliable");
  script_tag(name:"solution_type", value:"VendorFix");

  exit(0);
}

include("version_func.inc");
include("host_details.inc");

if( isnull( port = get_app_port( cpe:CPE ) ) )
  exit( 0 );

if( ! infos = get_app_version_and_location( cpe:CPE, port:port, exit_no_version:TRUE ) )
  exit( 0 );

version = infos["version"];
location = infos["location"];

if( version_is_less( version:version, test_version:"25.3.2.19" ) ) {
  report = report_fixed_ver( installed_version:version, fixed_version:"25.3.2.19", install_path:location );
  security_message( port:port, data:report );
  exit( 0 );
}

if( version_in_range_exclusive( version:version, test_version_lo:"26.0", test_version_up:"26.2.5.10" ) ) {
  report = report_fixed_ver( installed_version:version, fixed_version:"26.2.5.10", install_path:location );
  security_message( port:port, data:report );
  exit( 0 );
}

if( version_in_range_exclusive( version:version, test_version_lo:"27.0", test_version_up:"27.3.1" ) ) {
  report = report_fixed_ver( installed_version:version, fixed_version:"27.3.1", install_path:location );
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );