Denial of Service (DoS) Affecting com.googlecode.gwtupload:gwtupload package, versions [0,]



    Attack Complexity Low
    Availability High
Expand this section
7.5 high

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  • published 18 May 2020
  • disclosed 17 Feb 2020
  • credit Michal Dardas

How to fix?

There is no fixed version for com.googlecode.gwtupload:gwtupload.


com.googlecode.gwtupload:gwtupload is a library for uploading files to web servers, showing a progress bar with real information about the process (file size, bytes transferred, etc).

Affected versions of this package are vulnerable to Denial of Service (DoS). server/ (the servlet for handling file upload) accepts a delay parameter that causes a thread to sleep. It can be abused to cause all of a server's threads to sleep, leading to denial of service.


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