OSV-2020-156 Heap-buffer-overflow in flb_unescape_string_utf8
A heap buffer overflow in Fluent Bit's logfmt parser allows attackers to cause denial of service or potentially execute code via crafted log entries.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2020-156?
OSV-2020-156 is a memory corruption vulnerability in fluent-bit, published on 24 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22132
Crash type: Heap-buffer-overflow READ 1
Crash state:
flb_unescape_string_utf8
logfmt_parser
flb_parser_logfmt_do
Which versions are affected by OSV-2020-156?
1 open source package ship an affected version, including fluent-bit.
| Package | Affected | Fixed in |
|---|---|---|
fluent-bit OSS-Fuzz | All versions | None |
How do I fix OSV-2020-156?
No fix has been published for OSV-2020-156 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is OSV-2020-156 being exploited?
There is no known exploitation of OSV-2020-156 in the wild and no public exploit code.