Denial of Service

Affecting just-extend package, versions <4.0.0

low severity

Overview

just-extend is Part of a library of zero-dependency npm modules that do just do one thing.

Affected versions of this package are vulnerable to Denial of Service. The function just-extend could be tricked into adding or modifying properties of the Object prototype. These properties would be present on all objects.

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 just-extend to version 4.0.0 or higher.

References

Do your applications use this vulnerable package?

Credit
asgerf
CWE
CWE-400
Snyk ID
SNYK-JS-JUSTEXTEND-72674
Disclosed
09 Oct, 2018
Published
12 Dec, 2018