Use of insufficient randomness in Dnsmasq might lead to DNS Cache Poisoning.
|Package||net-dns/dnsmasq on all architectures|
|Affected versions||< 2.85|
|Unaffected versions||>= 2.85|
Dnsmasq is a lightweight and easily-configurable DNS forwarder and DHCP server.
It was discovered that Dnsmasq, when configured with --server=<address>@ or similar (e.g. through dbus), configured a fixed UDP port for all outgoing queries to the specified upstream DNS server.
An attacker, by sending malicious crafted DNS responses, could perform a DNS Cache Poisoning attack.
There is no known workaround at this time.
All Dnsmasq users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.85"
May 26, 2021
May 26, 2021: 1