CVE-2020-25686
20.01.2021, 17:15
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.Enginsight
| Vendor | Product | Version |
|---|---|---|
| thekelleys | dnsmasq | 𝑥 < 2.83 |
| debian | debian_linux | 10.0 |
| arista | eos | 4.21 ≤ 𝑥 < 4.21.14m |
| arista | eos | 4.22 ≤ 𝑥 < 4.22.9m |
| arista | eos | 4.23 ≤ 𝑥 < 4.23.7m |
| arista | eos | 4.24 ≤ 𝑥 < 4.24.5m |
| arista | eos | 4.25 ≤ 𝑥 < 4.25.2f |
𝑥
= Vulnerable software versions
Debian Releases
Ubuntu Releases
Ubuntu Product | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| dnsmasq |
|
Common Weakness Enumeration
- CWE-358 - Improperly Implemented Security Check for StandardThe software does not implement or incorrectly implements one or more security-relevant checks as specified by the design of a standardized algorithm, protocol, or technique.
- CWE-290 - Authentication Bypass by SpoofingThis attack-focused weakness is caused by improperly implemented authentication schemes that are subject to spoofing attacks.
References