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Vulnerability Details : CVE-2020-25682

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.
Publish Date : 2021-01-20 Last Update Date : 2021-03-26
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- CVSS Scores & Vulnerability Types

CVSS Score
8.3
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
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) Execute 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-2020-25682

# 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-2020-25682

https://www.jsof-tech.com/disclosures/dnspooq/
https://bugzilla.redhat.com/show_bug.cgi?id=1882014
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/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/package-announce@lists.fedoraproject.org/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-2020-25682

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


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