Rapid7 Vulnerability & Exploit Database

Huawei EulerOS: CVE-2020-25682: dnsmasq security update

Free InsightVM Trial No Credit Card Necessary
2024 Attack Intel Report Latest research by Rapid7 Labs
Back to Search

Huawei EulerOS: CVE-2020-25682: dnsmasq security update

Severity
8
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:C)
Published
01/20/2021
Created
02/02/2021
Added
02/02/2021
Modified
02/08/2021

Description

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.

Solution(s)

  • huawei-euleros-2_0_sp8-upgrade-dnsmasq
  • huawei-euleros-2_0_sp8-upgrade-dnsmasq-utils

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;