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Denial of Service (DoS) Affecting github.com/syncthing/syncthing/lib/relay/protocol package, versions <1.15.0

0.0
high

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.17% (54th percentile)
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NVD
7.5 high

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  • Snyk ID SNYK-GOLANG-GITHUBCOMSYNCTHINGSYNCTHINGLIBRELAYPROTOCOL-1243687
  • published 7 Apr 2021
  • disclosed 7 Apr 2021
  • credit Unknown
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Introduced: 7 Apr 2021

CVE-2021-21404 Open this link in a new tab
CWE-20 Open this link in a new tab

How to fix?

Upgrade github.com/syncthing/syncthing/lib/relay/protocol to version 1.15.0 or higher.

Overview

github.com/syncthing/syncthing/lib/relay/protocol is a continuous file synchronization program.

Affected versions of this package are vulnerable to Denial of Service (DoS). If sent a malformed relay protocol message with a negative length field, syncthing and the relay server strelaysrv can be caused to crash and exit.

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

References