[ASA-202009-13] brotli: denial of service

[Morten Linderud]

Arch Linux Security Advisory ASA-202009-13
==========================================

Severity: Medium
Date    : 2020-09-26
CVE-ID  : CVE-2020-8927
Package : brotli
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1230

Summary
=======

The package brotli before version 1.0.9-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 1.0.9-1.

# pacman -Syu "brotli>=1.0.9-1"

The problem has been fixed upstream in version 1.0.9.

Workaround
==========

None.

Description
===========

A buffer overflow exists in the Brotli library < 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.

Impact
======

A remote attacker might be able to cause a crash via crafted content.

References
==========

https://github.com/google/brotli/releases/tag/v1.0.9
https://github.com/google/brotli/commit/223d80cfbec8fd346e32906c732c8ede21f0cea6
https://security.archlinux.org/CVE-2020-8927
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