OSV-2020-68 Heap-double-free in ares_parse_soa_reply
A heap double-free vulnerability in the c-ares library allows attackers to cause denial of service or potentially execute 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-2020-68?
OSV-2020-68 is an use after free vulnerability in c-ares, 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=21176
Crash type: Heap-double-free
Crash state:
ares_parse_soa_reply
ares-test-fuzz.c
ares_parse_soa_reply
Which versions are affected by OSV-2020-68?
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-2020-68?
No fix has been published for OSV-2020-68 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is OSV-2020-68 being exploited?
There is no known exploitation of OSV-2020-68 in the wild and no public exploit code.