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Fedora 27 : tor (2017-bc2edc421d)

2018-01-15T00:00:00
ID FEDORA_2017-BC2EDC421D.NASL
Type nessus
Reporter Tenable
Modified 2018-02-02T00:00:00

Description

update to upstream release 0.3.1.9. Fixes various CVEs :

  • CVE-2017-8819: Replay-cache ineffective for v2 onion services

  • CVE-2017-8820: Remote DoS attack against directory authorities

  • CVE-2017-8821: An attacker can make Tor ask for a password

  • CVE-2017-8822: Relays can pick themselves in a circuit path

  • CVE-2017-8823: Use-after-free in onion service v2

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Fedora Security Advisory FEDORA-2017-bc2edc421d.
#

include("compat.inc");

if (description)
{
  script_id(105965);
  script_version("$Revision: 1.2 $");
  script_cvs_date("$Date: 2018/02/02 14:59:05 $");

  script_cve_id("CVE-2017-8819", "CVE-2017-8820", "CVE-2017-8821", "CVE-2017-8822", "CVE-2017-8823");
  script_xref(name:"FEDORA", value:"2017-bc2edc421d");

  script_name(english:"Fedora 27 : tor (2017-bc2edc421d)");
  script_summary(english:"Checks rpm output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Fedora host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"update to upstream release 0.3.1.9. Fixes various CVEs :

  - CVE-2017-8819: Replay-cache ineffective for v2 onion
    services

  - CVE-2017-8820: Remote DoS attack against directory
    authorities

  - CVE-2017-8821: An attacker can make Tor ask for a
    password

  - CVE-2017-8822: Relays can pick themselves in a circuit
    path

  - CVE-2017-8823: Use-after-free in onion service v2

Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as
possible without introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bodhi.fedoraproject.org/updates/FEDORA-2017-bc2edc421d"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected tor package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:tor");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:27");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/12/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/01/15");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018 Tenable Network Security, Inc.");
  script_family(english:"Fedora Local Security Checks");

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

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = eregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! ereg(pattern:"^27([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 27", "Fedora " + os_ver);

if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);


flag = 0;
if (rpm_check(release:"FC27", reference:"tor-0.3.1.9-1.fc27")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "tor");
}
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