FreeBSD 10.3 / 10.4 / 11.0 / 11.1 : ptrace / kldstat Information Disclosure Vulnerabilities (FreeBSD-SA-17:08.ptrace) (FreeBSD-SA-17:10.kldstat)

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(104970);
  script_version("1.8");
  script_cvs_date("Date: 2018/09/17 21:46:53");

  script_cve_id("CVE-2017-1086", "CVE-2017-1088");
  script_bugtraq_id(101857, 101861);

  script_name(english:"FreeBSD 10.3 / 10.4 / 11.0 / 11.1 : ptrace / kldstat Information Disclosure Vulnerabilities (FreeBSD-SA-17:08.ptrace) (FreeBSD-SA-17:10.kldstat)");
  script_summary(english:"Checks for the version of the FreeBSD kernel.");

  script_set_attribute(attribute:"synopsis", value:
"The remote FreeBSD host is missing a security-related update.");
  script_set_attribute(attribute:"description", value:
"The version of the FreeBSD kernel running on the remote host is prior
to 10.3-RELEASE-p24, 10.4 prior to 10.4-RELEASE-p3, 11.0 prior to
11.0-RELEASE-p15, or 11.1 prior to 11.1-RELEASE-p4. It is, therefore,
affected by a potential information disclosure vulnerabilities in
ptrace and kldstat. An authenticated, remote attacker can exploit this
issue by creating new ptrace_lwpinfo or kld_file_stat structs, which
may potentially contain unsanitized information from the kernel.");
  # https://www.freebsd.org/security/advisories/FreeBSD-SA-17:08.ptrace.asc
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5cbf9347");
  # https://www.freebsd.org/security/advisories/FreeBSD-SA-17:10.kldstat.asc
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3255f141");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the appropriate FreeBSD version.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/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-2017-1088");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/11/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/11/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/12/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");
  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2017-2018 Tenable Network Security, Inc.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Settings/ParanoidReport");

  exit(0);
}

include("audit.inc");
include("freebsd_package.inc");
include("misc_func.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/FreeBSD/release");
if (!release) audit(AUDIT_OS_NOT, "FreeBSD");

# Patches are available, require paranoid since it is possible
# to manually patch and have a lower OS level.
if (report_paranoia < 2) audit(AUDIT_PARANOID);

fix = NULL;

if (release =~ "^FreeBSD-([0-9]|10\.[0-3])($|[^0-9])")
  fix = "FreeBSD-10.3_24";
else if (release =~ "^FreeBSD-10\.4($|[^0-9])")
  fix = "FreeBSD-10.4_3";
else if (release =~ "^FreeBSD-11\.0($|[^0-9])")
  fix = "FreeBSD-11.0_15";
else if (release =~ "^FreeBSD-11\.1($|[^0-9])")
  fix = "FreeBSD-11.1_4";

if (isnull(fix) || pkg_cmp(pkg:release, reference:fix) >= 0)
  audit(AUDIT_HOST_NOT, "affected");

report =
  '\n  Installed version : ' + release +
  '\n  Fixed version     : ' + fix +
  '\n';
security_report_v4(port:0, severity:SECURITY_NOTE, extra:report);