CVE-2020-25682

Published: 19 January 2021

A flaw was found in dnsmasq before 2.83. A buffer overflow vulnerability was discovered in the way dnsmasq extract names from DNS packets before validating them with DNSSEC data. An attacker on the network, who can create valid DNS replies, could use this flaw to cause an overflow with arbitrary data in a heap-allocated memory, possibly executing code on the machine. The flaw is in the rfc1035.c:extract_name() function, which writes data to the memory pointed by name assuming MAXDNAME*2 bytes are available in the buffer. However, in some code execution paths, it is possible extract_name() gets passed an offset from the base buffer, thus reducing, in practice, the number of available bytes that can be written in the buffer. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Priority

Medium

CVSS 3 base score: 8.1

Status

Package Release Status
dnsmasq
Launchpad, Ubuntu, Debian
Upstream
Released (2.83)
Ubuntu 21.04 (Hirsute Hippo)
Released (2.82-1ubuntu2)
Ubuntu 20.10 (Groovy Gorilla)
Released (2.82-1ubuntu1.1)
Ubuntu 20.04 LTS (Focal Fossa)
Released (2.80-1.1ubuntu1.2)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (2.79-1ubuntu0.2)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (2.75-1ubuntu0.16.04.7)
Ubuntu 14.04 ESM (Trusty Tahr) Needs triage