Denial of Service (DoS) Affecting cryptography package, versions [,0.9.1)


Severity

Recommended
0.0
high
0
10

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  • Snyk IDSNYK-PYTHON-CRYPTOGRAPHY-40720
  • published4 Dec 2017
  • disclosed6 Jun 2015
  • creditUnknown

Introduced: 6 Jun 2015

CVE NOT AVAILABLE CWE-415  (opens in a new tab)

How to fix?

Upgrade cryptography to version 0.9.1 or higher.

Overview

Affected versions of cryptography are vulnerable to Denial of Service (DoS).

Double free vulnerability in the dsa_priv_decode function in crypto/dsa/dsa_ameth.c in OpenSSL 1.0.1 before 1.0.1s and 1.0.2 before 1.0.2g allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a malformed DSA private key. (related to CVE-2016-0705)

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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