OSV-2021-935 Heap-buffer-overflow in answer_request
A heap buffer overflow in the answer_request function allows attackers to cause denial of service or execute arbitrary code via crafted DNS responses.
- 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-2021-935?
OSV-2021-935 is a memory corruption vulnerability in dnsmasq, 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=35920
Crash type: Heap-buffer-overflow WRITE 1
Crash state:
answer_request
FuzzAnswerTheRequest
fuzz_rfc1035.c
Which versions are affected by OSV-2021-935?
1 open source package ship an affected version, including dnsmasq.
| Package | Affected | Fixed in |
|---|---|---|
dnsmasq OSS-Fuzz | All versions | None |
How do I fix OSV-2021-935?
No fix has been published for OSV-2021-935 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-2021-935 being exploited?
There is no known exploitation of OSV-2021-935 in the wild and no public exploit code.