Denial of Service (DoS) Affecting symfony/security-http package, versions >=2.3.0, <2.3.41>=2.6.0, <2.7.0>=2.4.0, <2.5.0>=2.7.0, <2.7.13>=2.5.0, <2.6.0>=2.8.0, <2.8.6>=3, <3.0.6


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
1.04% (85th percentile)

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  • Snyk IDSNYK-PHP-SYMFONYSECURITYHTTP-70197
  • published9 May 2016
  • disclosed9 May 2016
  • creditMarek Alaksa

Introduced: 9 May 2016

CVE-2016-4423  (opens in a new tab)
CWE-400  (opens in a new tab)
First added by Snyk

How to fix?

Upgrade symfony/security-http to version 2.3.41, 2.7.0, 2.5.0, 2.7.13, 2.6.0, 2.8.6, 3.0.6 or higher.

Overview

Affected versions of symfony/security-http are vulnerable to Denial of Service (DoS).

The attemptAuthentication function in Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php in Symfony before 2.3.41, 2.7.x before 2.7.13, 2.8.x before 2.8.6, and 3.0.x before 3.0.6 does not limit the length of a username stored in a session, which allows remote attackers to cause a denial of service (session storage consumption) via a series of authentication attempts with long, non-existent usernames.

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

CVSS Scores

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