CVE-2020-35963 Memory corruption in n/a
An out-of-bounds write in Fluent Bit's gzip compression allows attackers to execute arbitrary code or cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-35963?
CVE-2020-35963 is a high-severity memory corruption vulnerability in n/a, published on 3 Jan 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write because it does not use the correct calculation of the maximum gzip data-size expansion.
Weakness: CWE-787
Which versions are affected by CVE-2020-35963?
1 open source package ship an affected version, including fluent-bit. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
fluent-bit Bitnami | All versions | 1.6.4 |
Products include Treasuredata Fluent Bit.
How do I fix CVE-2020-35963?
Upgrade fluent-bit to 1.6.4 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-35963 being exploited?
There is no known exploitation of CVE-2020-35963 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as BIT-fluent-bit-2020-35963, GHSA-h5px-998j-r7c9.