Denial of Service (DoS) Affecting pillow package, versions [,8.1.2)
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Test your applications- Snyk ID SNYK-PYTHON-PILLOW-1081494
- published 3 Mar 2021
- disclosed 3 Mar 2021
- credit Jiayi Lin, Luke Shaffer, Xinran Xie, Akshay Ajayan
Introduced: 3 Mar 2021
CVE-2021-27921 Open this link in a new tabHow to fix?
Upgrade Pillow to version 8.1.2 or higher.
Overview
Pillow is a PIL (Python Imaging Library) fork.
Affected versions of this package are vulnerable to Denial of Service (DoS). This can happen in the BLP container format where the reported size of the contained image is not properly checked. These images can cause arbitrarily large memory allocations.
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
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