OSV-2021-907 Heap-buffer-overflow in decode_header_value_literal
A heap buffer overflow in the HTTP/2 header decoding logic allows remote attackers to cause a denial of service or potentially execute arbitrary code.
- 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-2021-907?
OSV-2021-907 is a memory corruption vulnerability in h2o, published on 1 Jul 2021. 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=35675
Crash type: Heap-buffer-overflow READ 1
Crash state:
decode_header_value_literal
decode_header
h2o_hpack_parse_request
Which versions are affected by OSV-2021-907?
1 open source package ship an affected version, including h2o.
| Package | Affected | Fixed in |
|---|---|---|
h2o OSS-Fuzz | All versions | None |
How do I fix OSV-2021-907?
No fix has been published for OSV-2021-907 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-2021-907 being exploited?
There is no known exploitation of OSV-2021-907 in the wild and no public exploit code.