Buffer overflow in Brotli library
CVE-2020-8927

5.3MEDIUM

Key Information:

Vendor

Google
Status
Brotli
Vendor
CVE Published:
15 September 2020

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2020-8927?

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.

Affected Version(s)

Brotli stable <= 1.0.7

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

cortex9-brotli-uncompressed-copy-narrowing-model
Created by federiconbaez

References

https://github.com/google/brotli/releases/tag/v1.0.9
x_refsource_CONFIRM
http://lists.opensuse.org/opensuse-security-announce/2020...
vendor-advisoryx_refsource_SUSE
https://lists.fedoraproject.org/archives/list/package-ann...
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CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jay Lv <nengzhi.pnz@antgroup.com>
.