CVE-2019-14513 Memory corruption in n/a

High 7.5 Published 1 Aug 2019 Updated 5 Aug 2024

An attacker-controlled DNS server can trigger a buffer over-read in Dnsmasq, potentially causing denial of service or code execution.

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

What is CVE-2019-14513?

CVE-2019-14513 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 1 Aug 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Improper bounds checking in Dnsmasq before 2.76 allows an attacker controlled DNS server to send large DNS packets that result in a read operation beyond the buffer allocated for the packet, a different vulnerability than CVE-2017-14491.

Weakness: CWE-125

Which versions are affected by CVE-2019-14513?

It affects 2 products.

Linux distribution packages (12)

`dnsmasq` Red Hat:enterprise_linux:7::client	All versions	`0:2.76-2.el7`
`dnsmasq-debuginfo` Red Hat:enterprise_linux:7::client	All versions	`0:2.76-2.el7`
`dnsmasq-utils` Red Hat:enterprise_linux:7::client	All versions	`0:2.76-2.el7`
`dnsmasq` Red Hat:enterprise_linux:7::computenode	All versions	`0:2.76-2.el7`
`dnsmasq-debuginfo` Red Hat:enterprise_linux:7::computenode	All versions	`0:2.76-2.el7`
`dnsmasq-utils` Red Hat:enterprise_linux:7::computenode	All versions	`0:2.76-2.el7`
`dnsmasq` Red Hat:enterprise_linux:7::server	All versions	`0:2.76-2.el7`
`dnsmasq-debuginfo` Red Hat:enterprise_linux:7::server	All versions	`0:2.76-2.el7`
`dnsmasq-utils` Red Hat:enterprise_linux:7::server	All versions	`0:2.76-2.el7`
`dnsmasq` Red Hat:enterprise_linux:7::workstation	All versions	`0:2.76-2.el7`
`dnsmasq-debuginfo` Red Hat:enterprise_linux:7::workstation	All versions	`0:2.76-2.el7`
`dnsmasq-utils` Red Hat:enterprise_linux:7::workstation	All versions	`0:2.76-2.el7`

Products include Debian Debian Linux, Thekelleys Dnsmasq.

How do I fix CVE-2019-14513?

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-2019-14513 being exploited?

There is no known exploitation of CVE-2019-14513 in the wild and no public exploit code.

All Debian Debian Linux vulnerabilities

Sources

Also known as DEBIAN-CVE-2019-14513, DLA-1921-1, GHSA-8x2j-2xxw-g7h5, RHBA-2017:2117, UBUNTU-CVE-2019-14513.