CVE-2017-9109 Memory corruption in n/a
A heap buffer overflow in the adns DNS library allows attackers to cause memory corruption, potentially leading to code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-9109?
CVE-2017-9109 is a critical memory corruption vulnerability in Fedoraproject Fedora, published on 18 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in adns before 1.5.2. It fails to ignore apparent answers before the first RR that was found the first time. when this is fixed, the second answer scan finds the same RRs at the first. Otherwise, adns can be confused by interleaving answers for the CNAME target, with the CNAME itself. In that case the answer data structure (on the heap) can be overrun. With this fixed, it prefers to look only at the answer RRs which come after the CNAME, which is at least arguably correct.
Weakness: CWE-119
Which versions are affected by CVE-2017-9109?
It affects 3 products.
Products include Fedoraproject Fedora, Gnu Adns, Opensuse Leap.
How do I fix CVE-2017-9109?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2017-9109 being exploited?
There is no known exploitation of CVE-2017-9109 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as DEBIAN-CVE-2017-9109, GHSA-4429-757q-f87q, UBUNTU-CVE-2017-9109.