This security advisory describes one medium risk vulnerability.

1) Buffer overflow

Risk: Medium

CVSSv3:
3.4 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID:
CVE-2020-8927

CWE-ID:
CWE-120 – Buffer Copy without Checking Size of Input (‘Classic Buffer Overflow’)

Exploit availability:
No

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

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.

Mitigation

Install update from vendor’s website.

Vulnerable software versions

brotli:
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

External links

https://github.com/google/brotli/releases/tag/v1.0.9

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.





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