Denial of Service (DoS)

Affecting openssl-osx package, versions >=1.0.204.1, <1.0.211

Do your applications use this vulnerable package? Test your applications

Overview

OpenSSL-OSX is a SSL/TLS and Crypto toolkit. Deprecated in OS X, this CocoaPod will add the latest OpenSSL to your OS X project.

Affected versions of this package are vulnerable to Denial of Service (DoS). The DTLS implementation in does not properly restrict the lifetime of queue entries associated with unused out-of-order messages, which allows remote attackers to cause a denial of service (memory consumption) by maintaining many crafted DTLS sessions simultaneously, related to d1_lib.c, statem_dtls.c, statem_lib.c, and statem_srvr.c.

Details

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

  • High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

  • Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

Remediation

Upgrade OpenSSL-OSX to version 1.0.211 or higher.

References

CVSS Score

7.5
high severity
  • Attack Vector
    Network
  • Attack Complexity
    Low
  • Privileges Required
    None
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    None
  • Integrity
    None
  • Availability
    High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Credit
Quan Luo
CVE
CVE-2016-2179
CWE
CWE-399
Snyk ID
SNYK-COCOAPODS-OPENSSLOSX-471039
Disclosed
22 Aug, 2016
Published
27 Nov, 2019