REDHAT-BUG-475964: Medium severity avahi autoip daemon vulnerability
Hugo Dias of the Synchron Security Labs discovered a remote denial of service flaw in the avahi daemon. A crafted multicast DNS (mDNS) packet with source port 0 can trigger assertion in originatesfromlocallegacyunicastsocket() function in avahi-core/server.c -- assert(port > 0); -- causing the daemon to call abort() and exit unexpectedly.
Scope of this attack is usually limited to a single LAN.
Affected Software
Event History
Frequently Asked Questions
What is the severity of REDHAT-BUG-475964?
The severity of REDHAT-BUG-475964 is classified as a remote denial of service vulnerability.
How do I fix REDHAT-BUG-475964?
To fix REDHAT-BUG-475964, update the avahi-daemon to the latest patched version available.
What does the vulnerability REDHAT-BUG-475964 affect?
REDHAT-BUG-475964 affects the avahi-daemon, specifically the handling of multicast DNS packets.
Can REDHAT-BUG-475964 be exploited remotely?
Yes, REDHAT-BUG-475964 can be exploited remotely by sending a crafted multicast DNS packet.
What versions of avahi-daemon are vulnerable to REDHAT-BUG-475964?
Versions of avahi-daemon prior to the latest update that addresses this issue are vulnerable to REDHAT-BUG-475964.