google brotli CVE-2020-8927 vulnerability in Google and Other Products
Published on September 15, 2020

Buffer overflow in Brotli library

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A buffer overflow exists in the Brotli library versions prior to 1.0.8 where an attacker controlling the input length of a "one-shot" decompression request to a script can trigger a crash, which happens when copying over chunks of data larger than 2 GiB. It is recommended to update your Brotli library to 1.0.8 or later. If one cannot update, we recommend to use the "streaming" API as opposed to the "one-shot" API, and impose chunk size limits.

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Vulnerability Analysis

CVE-2020-8927 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
LOW
Availability Impact:
NONE

Weakness Type

What is a length manipulation Vulnerability?

The software parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data. If an attacker can manipulate the length parameter associated with an input such that it is inconsistent with the actual length of the input, this can be leveraged to cause the target application to behave in unexpected, and possibly, malicious ways. One of the possible motives for doing so is to pass in arbitrarily large input to the application. Another possible motivation is the modification of application state by including invalid data for subsequent properties of the application. Such weaknesses commonly lead to attacks such as buffer overflows and execution of arbitrary code.

CVE-2020-8927 has been classified to as a length manipulation vulnerability or weakness.


Products Associated with CVE-2020-8927

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2020-8927 are published in these products:

Google Brotli
 
Debian Linux
 
Fedora Project Fedora
 
Canonical Ubuntu Linux
 
OpenSuse Leap
 
Microsoft Net
 
Microsoft .NET Core
 
Microsoft Powershell
 
Microsoft Visual Studio 2019
 
Microsoft Visual Studio 2022
 

Affected Versions

Google LLC Brotli:

Exploit Probability

EPSS
0.31%
Percentile
53.75%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.