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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-2020-25686: 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 receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the "Birthday Attacks" section of RFC5452. If chained with CVE-2020-25684, 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
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