RHEL 6 : ncurses (Unpatched Vulnerability)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory ncurses. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(196707);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/05/11");

  script_cve_id(
    "CVE-2017-10685",
    "CVE-2017-11112",
    "CVE-2017-11113",
    "CVE-2017-13728",
    "CVE-2017-13729",
    "CVE-2017-13730",
    "CVE-2017-13731",
    "CVE-2017-13732",
    "CVE-2017-13733",
    "CVE-2017-13734",
    "CVE-2017-16879",
    "CVE-2018-10754",
    "CVE-2018-19211",
    "CVE-2018-19217",
    "CVE-2019-17594",
    "CVE-2019-17595",
    "CVE-2020-19185",
    "CVE-2020-19186",
    "CVE-2020-19187",
    "CVE-2020-19188",
    "CVE-2020-19189",
    "CVE-2020-19190",
    "CVE-2021-39537",
    "CVE-2023-29491",
    "CVE-2023-50495"
  );

  script_name(english:"RHEL 6 : ncurses (Unpatched Vulnerability)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat 6 host is affected by multiple vulnerabilities that will not be patched.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple
vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - ncurses: Stack-based buffer overflow caused by format string vulnerability in fmt_entry function
    (CVE-2017-10685)

  - In ncurses 6.0, there is an attempted 0xffffffffffffffff access in the append_acs function of
    tinfo/parse_entry.c. It could lead to a remote denial of service attack if the terminfo library code is
    used to process untrusted terminfo data. (CVE-2017-11112)

  - In ncurses 6.0, there is a NULL Pointer Dereference in the _nc_parse_entry function of
    tinfo/parse_entry.c. It could lead to a remote denial of service attack if the terminfo library code is
    used to process untrusted terminfo data. (CVE-2017-11113)

  - There is an infinite loop in the next_char function in comp_scan.c in ncurses 6.0, related to libtic. A
    crafted input will lead to a remote denial of service attack. (CVE-2017-13728)

  - There is an illegal address access in the _nc_save_str function in alloc_entry.c in ncurses 6.0. It will
    lead to a remote denial of service attack. (CVE-2017-13729)

  - There is an illegal address access in the function _nc_read_entry_source() in progs/tic.c in ncurses 6.0
    that might lead to a remote denial of service attack. (CVE-2017-13730)

  - There is an illegal address access in the function postprocess_termcap() in parse_entry.c in ncurses 6.0
    that will lead to a remote denial of service attack. (CVE-2017-13731)

  - There is an illegal address access in the function dump_uses() in progs/dump_entry.c in ncurses 6.0 that
    might lead to a remote denial of service attack. (CVE-2017-13732)

  - There is an illegal address access in the fmt_entry function in progs/dump_entry.c in ncurses 6.0 that
    might lead to a remote denial of service attack. (CVE-2017-13733)

  - There is an illegal address access in the _nc_safe_strcat function in strings.c in ncurses 6.0 that will
    lead to a remote denial of service attack. (CVE-2017-13734)

  - Stack-based buffer overflow in the _nc_write_entry function in tinfo/write_entry.c in ncurses 6.0 allows
    attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a
    crafted terminfo file, as demonstrated by tic. (CVE-2017-16879)

  - Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn
    by its CNA. Further investigation showed that it was not a security issue. Notes: none (CVE-2018-10754)

  - In ncurses 6.1, there is a NULL pointer dereference at function _nc_parse_entry in parse_entry.c that will
    lead to a denial of service attack. The product proceeds to the dereference code path even after a
    dubious character `*' in name or alias field detection. (CVE-2018-19211)

  - In ncurses, possibly a 6.x version, there is a NULL pointer dereference at the function _nc_name_match
    that will lead to a denial of service attack. NOTE: the original report stated version 6.1, but the issue
    did not reproduce for that version according to the maintainer or a reliable third-party (CVE-2018-19217)

  - There is a heap-based buffer over-read in the _nc_find_entry function in tinfo/comp_hash.c in the terminfo
    library in ncurses before 6.1-20191012. (CVE-2019-17594)

  - There is a heap-based buffer over-read in the fmt_entry function in tinfo/comp_hash.c in the terminfo
    library in ncurses before 6.1-20191012. (CVE-2019-17595)

  - Buffer Overflow vulnerability in one_one_mapping function in progs/dump_entry.c:1373 in ncurses 6.1 allows
    remote attackers to cause a denial of service via crafted command. (CVE-2020-19185)

  - Buffer Overflow vulnerability in _nc_find_entry function in tinfo/comp_hash.c:66 in ncurses 6.1 allows
    remote attackers to cause a denial of service via crafted command. (CVE-2020-19186)

  - Buffer Overflow vulnerability in fmt_entry function in progs/dump_entry.c:1100 in ncurses 6.1 allows
    remote attackers to cause a denial of service via crafted command. (CVE-2020-19187)

  - Buffer Overflow vulnerability in fmt_entry function in progs/dump_entry.c:1116 in ncurses 6.1 allows
    remote attackers to cause a denial of service via crafted command. (CVE-2020-19188)

  - Buffer Overflow vulnerability in postprocess_terminfo function in tinfo/parse_entry.c:997 in ncurses 6.1
    allows remote attackers to cause a denial of service via crafted command. (CVE-2020-19189)

  - Buffer Overflow vulnerability in _nc_find_entry in tinfo/comp_hash.c:70 in ncurses 6.1 allows remote
    attackers to cause a denial of service via crafted command. (CVE-2020-19190)

  - An issue was discovered in ncurses through v6.2-1. _nc_captoinfo in captoinfo.c has a heap-based buffer
    overflow. (CVE-2021-39537)

  - ncurses before 6.4 20230408, when used by a setuid application, allows local users to trigger security-
    relevant memory corruption via malformed data in a terminfo database file that is found in $HOME/.terminfo
    or reached via the TERMINFO or TERM environment variable. (CVE-2023-29491)

  - NCurse v6.4-20230418 was discovered to contain a segmentation fault via the component _nc_wrap_entry().
    (CVE-2023-50495)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package
is installed.");
  script_set_attribute(attribute:"solution", value:
"The vendor has acknowledged the vulnerabilities but no solution has been provided. Refer to the vendor for remediation
guidance.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/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:H/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-2017-10685");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/06/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/05/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ncurses");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "redhat_repos.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm.inc');
include('rhel.inc');

if (!get_kb_item("global_settings/vendor_unpatched"))
exit(0, "Unpatched Vulnerabilities Detection not active.");

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/RedHat/release');
if (isnull(os_release) || 'Red Hat' >!< os_release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'ge', os_version: os_ver, rhel_version: '6')) audit(AUDIT_OS_NOT, 'Red Hat 6.x', 'Red Hat ' + os_ver);

if (!get_kb_item('Host/RedHat/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 && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = [
  {
    'pkgs': [
      {'reference':'ncurses', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'unpatched_pkg':'ncurses'}
    ]
  }
];


var flag = 0;
foreach var constraint_array ( constraints ) {
  var repo_relative_urls = NULL;
  var enterprise_linux_flag = rhel_repo_urls_has_content_dist_rhel(repo_urls:repo_relative_urls);
  foreach var pkg ( constraint_array['pkgs'] ) {
    var unpatched_pkg = NULL;
    var _release = NULL;
    var sp = NULL;
    var el_string = NULL;
    var rpm_spec_vers_cmp = NULL;
    var exists_check = NULL;
    var cves = NULL;
    if (!empty_or_null(pkg['unpatched_pkg'])) unpatched_pkg = pkg['unpatched_pkg'];
    if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (unpatched_pkg &&
        _release &&
        (!exists_check || rpm_exists(release:_release, rpm:exists_check)) &&
        unpatched_package_exists(release:_release, package:unpatched_pkg, cves: cves)) flag++;
  }
}

if (flag)
{
  var extra = NULL;
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : unpatched_packages_report()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ncurses');
}