CVE-2021-46879 Memory corruption in n/a
A heap overflow in Fluent Bit allows attackers to execute arbitrary code by tricking users into opening a malicious file.
- 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-2021-46879?
CVE-2021-46879 is a high-severity memory corruption vulnerability in n/a, published on 11 Apr 2023. 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
An issue was discovered in Treasure Data Fluent Bit 1.7.1, a wrong variable is used to get the msgpack data resulting in a heap overflow in flb_msgpack_gelf_value_ext. An attacker can craft a malicious file and tick the victim to open the file with the software, triggering a heap overflow and execute arbitrary code on the target system.
Weakness: CWE-787
Which versions are affected by CVE-2021-46879?
1 open source package ship an affected version, including fluent-bit. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
fluent-bit Bitnami | From 1.7.1 | 1.7.2 |
Products include Treasuredata Fluent Bit.
How do I fix CVE-2021-46879?
Upgrade fluent-bit to 1.7.2 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-46879 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-46879 exists.
Other vulnerabilities in n/a
Sources
Also known as BIT-fluent-bit-2021-46879, GHSA-m8h6-32jj-7hxp.