CVSS 3.7 · Low EPSS 2,2%
Kerentanan Inadequate Encryption Strength pada thekelleys dnsmasq, fedoraproject fedora +2 lainnya. Skor CVSS 3.1 3.7 (Low) menurut NVD.
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| thekelleys | dnsmasq | Semua versi sebelum 2.83 |
| fedoraproject | fedora | Versi 32 |
| fedoraproject | fedora | Versi 33 |
| debian | debian linux | Versi 10.0 |
| arista | eos | Versi 4.21 hingga sebelum 4.21.14m |
| arista | eos | Versi 4.22 hingga sebelum 4.22.9m |
| arista | eos | Versi 4.23 hingga sebelum 4.23.7m |
| arista | eos | Versi 4.24 hingga sebelum 4.24.5m |
| arista | eos | Versi 4.25 hingga sebelum 4.25.2f |