Denial of Service (DoS) Affecting github.com/emersion/go-smtp Open this link in a new tab package, versions <0.13.0


0.0
high
  • Attack Complexity

    Low

  • Availability

    High

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  • snyk-id

    SNYK-GOLANG-GITHUBCOMEMERSIONGOSMTP-1015603

  • published

    18 May 2020

  • disclosed

    18 May 2020

  • credit

    oogali

Introduced: 18 May 2020

CWE-400 Open this link in a new tab

How to fix?

Upgrade github.com/emersion/go-smtp to version 0.13.0 or higher.

Overview

github.com/emersion/go-smtp is a Package that implements the Simple Mail Transfer Protocol as defined in RFC 5321.

Affected versions of this package are vulnerable to Denial of Service (DoS) when the length message exceed MaxMessageBytes causes connection to hang.

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