A flaw was found in dnsmasq. The TFTP server can serve the wrong file contents because a recently used transfer cache is not invalidated when a transfer finishes. An attacker on the local network who can request a TFTP file may cause a later client to receive previously cached data instead of the requested file.
In PXE network-boot environments this can substitute attacker-chosen boot content for a victim machine.
Attack Parameters
Attack Vector
Adjacent
Requires local network access
Attack Complexity
High
Difficult to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
red hat:red hat enterprise linux 7
red hat:red hat openshift container platform 4
red hat:red hat openstack platform 18.0
red hat:red hat openshift container platform 5
red hat:red hat enterprise linux 9
red hat:red hat openstack platform 13 (queens)
red hat:red hat enterprise linux 6
red hat:red hat ceph storage 9
red hat:red hat enterprise linux 10
red hat:red hat enterprise linux 8