Denial of Service (DoS) Affecting symfony/polyfill package, versions >=1.0.0, <1.10.0


0.0
medium

Snyk CVSS

    Attack Complexity Low

    Threat Intelligence

    EPSS 0.24% (64th percentile)
Expand this section
NVD
5.3 medium

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  • Snyk ID SNYK-PHP-SYMFONYPOLYFILL-72556
  • published 4 Nov 2018
  • disclosed 27 Dec 2014
  • credit Unknown

How to fix?

Upgrade symfony/polyfill to version 1.10.0 or higher.

Overview

symfony/polyfill backporting features to lower PHP versions.

Affected versions of this package are vulnerable to Denial of Service (DoS) attacks (CPU consumption) via a long password that triggers an expensive hash computation, as demonstrated by a PBKDF2 computation, a similar issue to CVE-2013-5750.

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