OSV-2020-530 Stack-buffer-overflow in ares_parse_aaaa_reply
A stack buffer overflow in the c-ares library allows attackers to execute arbitrary code or cause denial of service via crafted DNS AAAA replies.
- 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-2020-530?
OSV-2020-530 is a memory corruption vulnerability in c-ares, published on 1 Jul 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=15459
Crash type: Stack-buffer-overflow WRITE 4
Crash state:
ares_parse_aaaa_reply
ares-test-fuzz.c
Which versions are affected by OSV-2020-530?
1 open source package ship an affected version, including c-ares.
| Package | Affected | Fixed in |
|---|---|---|
c-ares OSS-Fuzz | All versions | None |
How do I fix OSV-2020-530?
No fix has been published for OSV-2020-530 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-2020-530 being exploited?
There is no known exploitation of OSV-2020-530 in the wild and no public exploit code.