Vulnerabilities > CVE-2018-1159 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Mikrotik Routeros

047910
CVSS 6.5 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
LOW
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
HIGH
network
low complexity
mikrotik
CWE-119
nessus
NVD
Published: 2018-08-23
Updated: 2024-11-21

Summary

Mikrotik RouterOS before 6.42.7 and 6.40.9 is vulnerable to a memory corruption vulnerability. An authenticated remote attacker can crash the HTTP server by rapidly authenticating and disconnecting.

Vulnerable Configurations

Part Description Count
OS
Mikrotik
369

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Nessus

NASL familyMisc.
NASL idMIKROTIK_AUG_2018.NASL
descriptionAccording to its self-reported version, the remote networking device is running a version of MikroTik prior to 6.40.9, 6.41.x < 6.42.7, or 6.43. It, therefore, vulnerable to multiple vulnerabilities.
last seen2020-06-01
modified2020-06-02
plugin id112114
published2018-08-24
reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/112114
titleMikroTik RouterOS < 6.40.9 / 6.42.7 / 6.43 multiple vulnerabilities.
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(112114);
  script_version("1.3");
  script_cvs_date("Date: 2019/11/04");

  script_cve_id(
    "CVE-2018-1156",
    "CVE-2018-1157",
    "CVE-2018-1158",
    "CVE-2018-1159"
  );

  script_name(english:"MikroTik RouterOS <  6.40.9 / 6.42.7 / 6.43 multiple vulnerabilities.");
  script_summary(english:"Checks RouterOS version");

  script_set_attribute(attribute:"synopsis", value:
"The remote networking device is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version, the remote networking device
is running a version of MikroTik prior to 6.40.9, 6.41.x <
6.42.7, or 6.43. It, therefore, vulnerable to multiple vulnerabilities.");
  # https://blog.mikrotik.com/security/security-issues-discovered-by-tenable.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?237622b9");
  # https://forum.mikrotik.com/viewtopic.php?f=21&t=138331
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f9e2af40");
  # https://forum.mikrotik.com/viewtopic.php?f=21&t=138228
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c37b423c");
  script_set_attribute(attribute:"solution", value:
"Upgrade to MikroTik RouterOS 6.40.9 / 6.42.7 / 6.43 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-1156");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/08/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/08/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/08/24");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mikrotik:routeros");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("mikrotik_detect.nasl");
  script_require_keys("MikroTik/RouterOS/Version");

  exit(0);
}

include("vcf.inc");
include("audit.inc");

app = "MikroTik";
kb_ver = "MikroTik/RouterOS/Version";
# The version can be NULL when only SSH service is running.
version = get_kb_item_or_exit(kb_ver);
if(empty_or_null(version)) audit(AUDIT_UNKNOWN_APP_VER, app);

app_info = vcf::get_app_info(app:app, kb_ver:kb_ver, service:FALSE);

constraints = [{ "fixed_version" : "6.40.9" },
               { "min_version" : "6.41", "fixed_version" : "6.42.7" }];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE, strict:FALSE);

The Hacker News

idTHN:15F5633BC0BA0C82579744CCACA99558
last seen2018-10-08
modified2018-10-08
published2018-10-08
reporterThe Hacker News
sourcehttps://thehackernews.com/2018/10/router-hacking-exploit.html
titleNew Exploit for MikroTik Router WinBox Vulnerability Gives Full Root Access

References