OSV-2021-940 Heap-buffer-overflow in json_string_unescape
A heap buffer overflow in the JSON string unescaping function allows attackers to cause crashes or potentially execute arbitrary code via crafted input.
- 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-2021-940?
OSV-2021-940 is a memory corruption vulnerability in wireshark, published on 9 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=35925
Crash type: Heap-buffer-overflow WRITE 1
Crash state:
json_string_unescape
after_value
execute_callbacks
Which versions are affected by OSV-2021-940?
1 open source package ship an affected version, including wireshark.
| Package | Affected | Fixed in |
|---|---|---|
wireshark OSS-Fuzz | All versions | None |
How do I fix OSV-2021-940?
No fix has been published for OSV-2021-940 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-2021-940 being exploited?
There is no known exploitation of OSV-2021-940 in the wild and no public exploit code.