CVE-2011-0520 Memory corruption in n/a

High 7.5 Published 28 Jan 2011 Updated 6 Aug 2024

Remote attackers can cause a denial of service or execute arbitrary code via a heap-based buffer overflow in MaraDNS triggered by long DNS hostnames.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2011-0520?

CVE-2011-0520 is a high-severity memory corruption vulnerability in n/a, published on 28 Jan 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The compress_add_dlabel_points function in dns/Compress.c in MaraDNS 1.4.03, 1.4.05, and probably other versions allows remote attackers to cause a denial of service (segmentation fault) and possibly execute arbitrary code via a long DNS hostname with a large number of labels, which triggers a heap-based buffer overflow.

Weakness: CWE-119

Which versions are affected by CVE-2011-0520?

It affects 1 product.

Products include Maradns Maradns.

How do I fix CVE-2011-0520?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2011-0520 being exploited?

There is no known exploitation of CVE-2011-0520 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2011-0520, DSA-2196-1, GHSA-7vq7-qcwq-j3vc.