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Vulnerability Details : CVE-2020-25685

A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.
Publish Date : 2021-01-20 Last Update Date : 2022-02-14
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- CVSS Scores & Vulnerability Types

CVSS Score
4.3
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
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 None (There is no impact to the availability of the system.)
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)
CWE ID 326

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2021:0150: dnsmasq security update (Important) oval:com.redhat.rhsa:def:20210150 unix
RHSA-2021:0153: dnsmasq security update (Moderate) oval:com.redhat.rhsa:def:20210153 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-2020-25685

# Product Type Vendor Product Version Update Edition Language
1 OS Arista EOS * * * * 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
Arista EOS 1
Debian Debian Linux 1
Fedoraproject Fedora 2
Thekelleys Dnsmasq 1

- References For CVE-2020-25685

https://lists.fedoraproject.org/archives/list/[email protected]/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/
FEDORA FEDORA-2021-2e4c3d5a9d
https://security.gentoo.org/glsa/202101-17
GENTOO GLSA-202101-17
https://www.debian.org/security/2021/dsa-4844
DEBIAN DSA-4844
https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61
https://lists.fedoraproject.org/archives/list/[email protected]/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/
FEDORA FEDORA-2021-84440e87ba
https://bugzilla.redhat.com/show_bug.cgi?id=1889688
https://www.jsof-tech.com/disclosures/dnspooq/

- Metasploit Modules Related To CVE-2020-25685

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


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