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CVE-2020-25686 A flaw was found in dnsmasq before version 2.83
Description
A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the "Birthday Attacks" section of RFC5452. 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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| dnsmasq | Versions not published |
References
- www.jsof-tech.com www.jsof-tech.com
- bugzilla.redhat.com bugzilla.redhat.com
- FEDORA-2021-84440e87ba lists.fedoraproject.org
- GLSA-202101-17 security.gentoo.org
- DSA-4844 www.debian.org
- FEDORA-2021-2e4c3d5a9d lists.fedoraproject.org
- www.arista.com www.arista.com
Timeline
- Published
- Last modified
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The 10 CVEs of dnsmasq →
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CVE-2020-14312
A flaw was found in the default configuration of dnsmasq, as shipped with Fedora versions prior to 31 and in all…
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CVE-2020-25681
A flaw was found in dnsmasq before version 2.83
Not rated