Brotli up to 1.0.7 Decompression length parameter

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Brotli up to 1.0.7. Affected by this issue is some unknown functionality of the component Decompression Handler. This manipulation causes length parameter. The identification of this vulnerability is CVE-2020-8927. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Brotli up to 1.0.7 and classified as problematic. Affected by this vulnerability is an unknown functionality of the component Decompression Handler. The manipulation with an unknown input leads to a length parameter vulnerability. The CWE definition for the vulnerability is CWE-130. The product 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. As an impact it is known to affect availability. The summary by CVE is:

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.

The weakness was shared 09/15/2020 (GitHub Repository). It is possible to read the advisory at github.com. This vulnerability is known as CVE-2020-8927 since 02/12/2020. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 236717 (Alibaba Cloud Linux 3 : 0118: brotli (ALINUX3-SA-2022:0118)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.0.8 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (236717). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• Brotli

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6
• 1.0.7

CPE 2.3info

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CPE 2.2info

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Be aware that VulDB is the high quality source for vulnerability data.

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