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Vulnerability & Exploit Database

Vulnerabilities and exploits collected over reliable resources for security professionals and researchers to review

Amazon Linux AMI 2: CVE-2020-25684: Security patch for dnsmasq (ALAS-2021-1587)

Severity:
4
CVSS:
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published:
01/20/2020
Created:
01/28/2020
Added:
01/27/2020
Modified:
02/08/2020

Description:

A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.'

Solution(s)


  • amazon-linux-ami-2-upgrade-dnsmasq
  • amazon-linux-ami-2-upgrade-dnsmasq-debuginfo
  • amazon-linux-ami-2-upgrade-dnsmasq-utils

Reference(s)

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