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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.
| Reporter | Title | Published | Views | Family All 149 |
|---|---|---|---|---|
 | dnsmasq -- DNS cache poisoning, and DNSSEC buffer overflow, vulnerabilities | 16 Sep 202000:00 | – | freebsd |
 | Security fix for the ALT Linux 10 package dnsmasq version 2.83-alt1 | 22 Jan 202100:00 | – | altlinux |
 | Alibaba Cloud Linux 3 : 0009: dnsmasq (ALINUX3-SA-2021:0009) | 14 May 202500:00 | – | nessus |
| CentOS 8 : dnsmasq (CESA-2021:0150) | 29 Jan 202100:00 | – | nessus |
| Debian DLA-2604-1 : dnsmasq security update | 23 Mar 202100:00 | – | nessus |
| Debian DSA-4844-1 : dnsmasq - security update | 5 Feb 202100:00 | – | nessus |
| dnsmasq < 2.83 Multiple Vulnerabilities (DNSPOOQ) | 19 Jan 202100:00 | – | nessus |
| EulerOS 2.0 SP8 : dnsmasq (EulerOS-SA-2021-1138) | 1 Feb 202100:00 | – | nessus |
| EulerOS 2.0 SP9 : dnsmasq (EulerOS-SA-2021-1244) | 5 Feb 202100:00 | – | nessus |
| EulerOS 2.0 SP9 : dnsmasq (EulerOS-SA-2021-1263) | 5 Feb 202100:00 | – | nessus |
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29 Jan 2021 08:00Current
7High risk
Vulners AI Score7
CVSS 3.18.1
CVSS 28.3
EPSS0.34287