Vulnerabilities > CVE-2018-6664 - Improper Verification of Cryptographic Signature vulnerability in Mcafee Data Loss Prevention Endpoint

047910
CVSS 8.8 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
LOW
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
mcafee
CWE-347
nessus

Summary

Application Protections Bypass vulnerability in Microsoft Windows in McAfee Data Loss Prevention (DLP) Endpoint before 10.0.500 and DLP Endpoint before 11.0.400 allows authenticated users to bypass the product block action via a command-line utility.

Vulnerable Configurations

Part Description Count
Application
Mcafee
45
OS
Microsoft
1

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Padding Oracle Crypto Attack
    An attacker is able to efficiently decrypt data without knowing the decryption key if a target system leaks data on whether or not a padding error happened while decrypting the ciphertext. A target system that leaks this type of information becomes the padding oracle and an attacker is able to make use of that oracle to efficiently decrypt data without knowing the decryption key by issuing on average 128*b calls to the padding oracle (where b is the number of bytes in the ciphertext block). In addition to performing decryption, an attacker is also able to produce valid ciphertexts (i.e., perform encryption) by using the padding oracle, all without knowing the encryption key. Any cryptosystem can be vulnerable to padding oracle attacks if the encrypted messages are not authenticated to ensure their validity prior to decryption, and then the information about padding error is leaked to the attacker. This attack technique may be used, for instance, to break CAPTCHA systems or decrypt/modify state information stored in client side objects (e.g., hidden fields or cookies). This attack technique is a side-channel attack on the cryptosystem that uses a data leak from an improperly implemented decryption routine to completely subvert the cryptosystem. The one bit of information that tells the attacker whether a padding error during decryption has occurred, in whatever form it comes, is sufficient for the attacker to break the cryptosystem. That bit of information can come in a form of an explicit error message about a padding error, a returned blank page, or even the server taking longer to respond (a timing attack). This attack can be launched cross domain where an attacker is able to use cross-domain information leaks to get the bits of information from the padding oracle from a target system / service with which the victim is communicating. To do so an attacker sends a request containing ciphertext to the target system. Due to the browser's same origin policy, the attacker is not able to see the response directly, but can use cross-domain information leak techniques to still get the information needed (i.e., information on whether or not a padding error has occurred). For instance, this can be done using "img" tag plus the onerror()/onload() events. The attacker's JavaScript can make web browsers to load an image on the target site, and know if the image is loaded or not. This is 1-bit information needed for the padding oracle attack to work: if the image is loaded, then it is valid padding, otherwise it is not.

Nessus

NASL familyWindows
NASL idMCAFEE_DLPE_SB10233.NASL
descriptionThe version of the McAfee Data Loss Prevention Endpoint (DLPe) Agent installed on the remote Windows host is prior to 10.0.500 or 11.x prior to 11.0.400. It is, therefore, affected by a master bypass vulnerability. An authenticated attacker can exploit this issue using a command line utility to bypass the product block option.
last seen2020-06-01
modified2020-06-02
plugin id127116
published2019-08-05
reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/127116
titleMcAfee DLPe Agent < 10.0.500 / 11.x < 11.0.400 Master Bypass Vulnerability (SB10233)