Denial of Service (DoS)

Affecting privacyidea package, versions [,2.23.2)

Overview

privacyidea is an open solution for strong two-factor authentication.

Affected versions of this package are vulnerable to Denial of Service (DoS) attacks due to an Improper input validation in token validation api.

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 privacyidea to version 2.23.2 or higher.

References

Do your applications use this vulnerable package?

CVSS Score

5.9
medium severity
  • Attack Vector
    Local
  • Attack Complexity
    Low
  • Privileges Required
    None
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    Low
  • Integrity
    Low
  • Availability
    Low
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Credit
Unknown
CVE
CVE-2018-1000809
CWE
CWE-400
Snyk ID
SNYK-PYTHON-PRIVACYIDEA-72432
Disclosed
07 Sep, 2018
Published
10 Oct, 2018