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A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. A remote attacker who can create valid DNS replies could use this flaw to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name() which could be abused to make the code execute memcpy() with a negative size in get_rdata() and cause a crash in dnsmasq resulting in a denial of service. The highest threat from this vulnerability is to system availability.
| Reporter | Title | Published | Views | Family All 143 |
|---|---|---|---|---|
 | 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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27 Jan 2021 08:00Current
7High risk
Vulners AI Score7
CVSS 3.15.9
CVSS 27.1
EPSS0.31317