The code in pppd that formats a response to a PEAP Request packet in peap_response() copies an entire TLS record of up to 16384 bytes into the fixed global buffer outpacket_buf
without checking the available space and without implementing outgoing
PEAP fragmentation. Thus a pppd process connecting to a server which
requests PEAP authentication can be induced to corrupt global static
data following the outpacket_buf array, most likely causing incorrect behavior or a crash.
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
ppp project:ppp