Total vulnerabilities in the database
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.
| Software | From | Fixed in |
|---|---|---|
| thekelleys / dnsmasq | - | 2.83 |
| fedoraproject / fedora | 32 | 32.x |
| fedoraproject / fedora | 33 | 33.x |
| debian / debian_linux | 10.0 | 10.0.x |
| arista / eos | 4.21 | 4.21.14m |
| arista / eos | 4.22 | 4.22.9m |
| arista / eos | 4.23 | 4.23.7m |
| arista / eos | 4.24 | 4.24.5m |
| arista / eos | 4.25 | 4.25.2f |