CVE-2011-4528 Use after free in n/a
Remote attackers can crash the Unbound DNS resolver by sending crafted responses with duplicate CNAME records, causing a 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-2011-4528?
CVE-2011-4528 is a medium-severity use after free vulnerability in n/a, published on 20 Dec 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME records in a signed zone, which allows remote DNS servers to cause a denial of service (daemon crash) via a crafted response.
Weakness: CWE-399
Which versions are affected by CVE-2011-4528?
It affects 1 product.
Products include Unbound Unbound.
How do I fix CVE-2011-4528?
Upgrade to a fixed version.
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 CVE-2011-4528 being exploited?
There is no known exploitation of CVE-2011-4528 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as DEBIAN-CVE-2011-4528, GHSA-q376-m379-55x8.