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Vulnerability Details : CVE-2020-25687

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. This flaw allows a remote attacker, who can create valid DNS replies, 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 sort_rrset() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Publish Date : 2021-01-20 Last Update Date : 2021-03-26
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- CVSS Scores & Vulnerability Types

CVSS Score
7.1
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of ServiceExecute CodeOverflow
CWE ID 122

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2021:0150: dnsmasq security update (Important) oval:com.redhat.rhsa:def:20210150 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2020-25687

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 9.0 * * * Version Details Vulnerabilities
2 OS Debian Debian Linux 10.0 * * * Version Details Vulnerabilities
3 OS Fedoraproject Fedora 32 * * * Version Details Vulnerabilities
4 OS Fedoraproject Fedora 33 * * * Version Details Vulnerabilities
5 Application Thekelleys Dnsmasq * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 2
Fedoraproject Fedora 2
Thekelleys Dnsmasq 1

- References For CVE-2020-25687

https://www.jsof-tech.com/disclosures/dnspooq/
https://bugzilla.redhat.com/show_bug.cgi?id=1891568
https://lists.fedoraproject.org/archives/list/[email protected]/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/
FEDORA FEDORA-2021-84440e87ba
https://security.gentoo.org/glsa/202101-17
GENTOO GLSA-202101-17
https://www.debian.org/security/2021/dsa-4844
DEBIAN DSA-4844
https://lists.fedoraproject.org/archives/list/[email protected]/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/
FEDORA FEDORA-2021-2e4c3d5a9d
https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html
MLIST [debian-lts-announce] 20210322 [SECURITY] [DLA 2604-1] dnsmasq security update

- Metasploit Modules Related To CVE-2020-25687

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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