CVE-2020-25682HIGH
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.
References
https://bugzilla.redhat.com/show_bug.cgi?id=1882014
https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html
https://security.gentoo.org/glsa/202101-17
Details
Source: MITRE
Published: 2021-01-20
Updated: 2021-03-26
Type: CWE-122
Risk Information
CVSS v2.0
Base Score: 8.3
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:C
Impact Score: 8.5
Exploitability Score: 8.6
Severity: HIGH
CVSS v3.0
Base Score: 8.1
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 2.2
Severity: HIGH
Vulnerable Software
Configuration 1
OR
Configuration 2
OR
Configuration 3
OR
Tenable Plugins
| ID | Name | Product | Family | Severity |
|---|---|---|---|---|
| 148783 | Fedora 32 : dnsmasq (2021-2e4c3d5a9d) | Nessus | Fedora Local Security Checks | high |
| 148613 | EulerOS Virtualization 2.9.1 : dnsmasq (EulerOS-SA-2021-1733) | Nessus | Huawei Local Security Checks | high |
| 148581 | EulerOS Virtualization 2.9.0 : dnsmasq (EulerOS-SA-2021-1758) | Nessus | Huawei Local Security Checks | high |
| 148050 | EulerOS 2.0 SP5 : dnsmasq (EulerOS-SA-2021-1673) | Nessus | Huawei Local Security Checks | high |
| 147960 | Debian DLA-2604-1 : dnsmasq security update | Nessus | Debian Local Security Checks | high |
| 147582 | EulerOS Virtualization for ARM 64 3.0.2.0 : dnsmasq (EulerOS-SA-2021-1389) | Nessus | Huawei Local Security Checks | high |
| 147517 | EulerOS Virtualization 3.0.6.6 : dnsmasq (EulerOS-SA-2021-1469) | Nessus | Huawei Local Security Checks | high |
| 147462 | EulerOS Virtualization 3.0.2.6 : dnsmasq (EulerOS-SA-2021-1411) | Nessus | Huawei Local Security Checks | high |
| 147341 | NewStart CGSL MAIN 6.02 : dnsmasq Multiple Vulnerabilities (NS-SA-2021-0091) | Nessus | NewStart CGSL Local Security Checks | high |
| 147133 | EulerOS Virtualization for ARM 64 3.0.6.0 : dnsmasq (EulerOS-SA-2021-1551) | Nessus | Huawei Local Security Checks | high |
| 146735 | EulerOS 2.0 SP3 : dnsmasq (EulerOS-SA-2021-1374) | Nessus | Huawei Local Security Checks | high |
| 146697 | EulerOS 2.0 SP2 : dnsmasq (EulerOS-SA-2021-1288) | Nessus | Huawei Local Security Checks | high |
| 146369 | Slackware 14.0 / 14.1 / 14.2 / current : dnsmasq (SSA:2021-040-01) | Nessus | Slackware Local Security Checks | high |
| 146242 | Debian DSA-4844-1 : dnsmasq - security update | Nessus | Debian Local Security Checks | high |
| 146224 | EulerOS 2.0 SP9 : dnsmasq (EulerOS-SA-2021-1263) | Nessus | Huawei Local Security Checks | high |
| 146218 | EulerOS 2.0 SP9 : dnsmasq (EulerOS-SA-2021-1244) | Nessus | Huawei Local Security Checks | high |
| 145737 | EulerOS 2.0 SP8 : dnsmasq (EulerOS-SA-2021-1138) | Nessus | Huawei Local Security Checks | high |
| 145698 | CentOS 8 : dnsmasq (CESA-2021:0150) | Nessus | CentOS Local Security Checks | high |
| 145421 | Photon OS 2.0: Dnsmasq PHSA-2021-2.0-0312 | Nessus | PhotonOS Local Security Checks | high |
| 145420 | Photon OS 1.0: Dnsmasq PHSA-2021-1.0-0356 | Nessus | PhotonOS Local Security Checks | high |
| 145414 | Photon OS 3.0: Dnsmasq PHSA-2021-3.0-0186 | Nessus | PhotonOS Local Security Checks | high |
| 145356 | openSUSE Security Update : dnsmasq (openSUSE-2021-124) | Nessus | SuSE Local Security Checks | high |
| 145295 | openSUSE Security Update : dnsmasq (openSUSE-2021-129) | Nessus | SuSE Local Security Checks | high |
| 145282 | GLSA-202101-17 : Dnsmasq: Multiple vulnerabilities | Nessus | Gentoo Local Security Checks | high |
| 145241 | Fedora 33 : dnsmasq (2021-84440e87ba) | Nessus | Fedora Local Security Checks | high |
| 145236 | FreeBSD : dnsmasq -- DNS cache poisoning, and DNSSEC buffer overflow, vulnerabilities (5b5cf6e5-5b51-11eb-95ac-7f9491278677) | Nessus | FreeBSD Local Security Checks | high |
| 145199 | SUSE SLES15 Security Update : dnsmasq (SUSE-SU-2021:0162-1) | Nessus | SuSE Local Security Checks | high |
| 145175 | SUSE SLES12 Security Update : dnsmasq (SUSE-SU-2021:0166-1) | Nessus | SuSE Local Security Checks | high |
| 145108 | SUSE SLED15 / SLES15 Security Update : dnsmasq (SUSE-SU-2021:0163-1) | Nessus | SuSE Local Security Checks | high |
| 145088 | RHEL 8 : dnsmasq (RHSA-2021:0150) | Nessus | Red Hat Local Security Checks | high |
| 145086 | Oracle Linux 8 : dnsmasq (ELSA-2021-0150) | Nessus | Oracle Linux Local Security Checks | high |
| 145082 | RHEL 8 : dnsmasq (RHSA-2021:0152) | Nessus | Red Hat Local Security Checks | high |
| 145078 | Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 : Dnsmasq vulnerabilities (USN-4698-1) | Nessus | Ubuntu Local Security Checks | high |
| 145077 | RHEL 8 : dnsmasq (RHSA-2021:0151) | Nessus | Red Hat Local Security Checks | high |
| 145073 | dnsmasq < 2.83 Multiple Vulnerabilities (DNSPOOQ) | Nessus | DNS | high |