GnuTLS < 2.2.5 Vulnerability - Linux

# SPDX-FileCopyrightText: 2008 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

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.90026");
  script_version("2024-02-22T05:06:55+0000");
  script_tag(name:"last_modification", value:"2024-02-22 05:06:55 +0000 (Thu, 22 Feb 2024)");
  script_tag(name:"creation_date", value:"2008-09-06 11:16:56 +0200 (Sat, 06 Sep 2008)");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_cve_id("CVE-2008-1948", "CVE-2008-1949", "CVE-2008-1950");
  script_name("GnuTLS < 2.2.5 Vulnerability - Linux");
  script_category(ACT_GATHER_INFO);
  script_tag(name:"qod_type", value:"executable_version_unreliable");
  script_copyright("Copyright (C) 2008 Greenbone AG");
  script_family("General");
  script_mandatory_keys("login/SSH/success");
  script_dependencies("gather-package-list.nasl");
  script_exclude_keys("ssh/no_linux_shell");

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

  script_tag(name:"solution", value:"All GnuTLS users should upgrade to the latest version.");

  script_tag(name:"impact", value:"CVE-2008-1948
  The _gnutls_server_name_recv_params function in lib/ext_server_name.c
  in libgnutls in gnutls-serv in GnuTLS before 2.2.4 does not properly
  calculate the number of Server Names in a TLS 1.0 Client Hello
  message during extension handling, which allows remote attackers
  to cause a denial of service (crash) or possibly execute arbitrary
  code via a zero value for the length of Server Names, which leads
  to a buffer overflow in session resumption data in the
  pack_security_parameters function, aka GNUTLS-SA-2008-1-1.

  CVE-2008-1949

  The _gnutls_recv_client_kx_message function in lib/gnutls_kx.c
  in libgnutls in gnutls-serv in GnuTLS before 2.2.4 continues to
  process Client Hello messages within a TLS message after one has
  already been processed, which allows remote attackers to cause a
  denial of service (NULL dereference and crash) via a TLS message
  containing multiple Client Hello messages, aka GNUTLS-SA-2008-1-2.

  CVE 2008-1950

  Integer signedness error in the _gnutls_ciphertext2compressed
  function in lib/gnutls_cipher.c in libgnutls in GnuTLS before 2.2.4
  allows remote attackers to cause a denial of service (buffer over-read
  and crash) via a certain integer value in the Random field in an
  encrypted Client Hello message within a TLS record with an invalid
  Record Length, which leads to an invalid cipher padding length,
  aka GNUTLS-SA-2008-1-3.");

  script_tag(name:"summary", value:"The remote host is probably affected by the vulnerabilities
  described in CVE-2008-1948, CVE-2008-1949, CVE-2008-1950.");

  exit(0);
}

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

sock = ssh_login_or_reuse_connection();
if(!sock)
  exit(0);

gnuPath = ssh_find_file(file_name:"/gnutls-cli$", useregex:TRUE, sock:sock);
foreach gnutlsBin (gnuPath)
{

  gnutlsBin = chomp(gnutlsBin);
  if(!gnutlsBin)
    continue;

  gnutlsVer = ssh_get_bin_version(full_prog_name:gnutlsBin, sock:sock, version_argv:"--version", ver_pattern:"version ([0-9.]+)");
  if(gnutlsVer[1])
  {
    if(version_is_less(version:gnutlsVer[1], test_version:"2.2.4")){
      security_message( port: 0, data: "The target host was found to be vulnerable" );
    }
    ssh_close_connection();
    exit(0);
  }
}
ssh_close_connection();