Core FTP 2.0 build 653 contains a denial of service vulnerability in the PBSZ command that allows unauthenticated attackers to crash the service by sending a malformed command with an oversized buffer. Attackers can send a PBSZ command with a payload exceeding 211 bytes to trigger an access violation and crash the FTP server process.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 4
http://coreftp.com/server/download/archive/CoreFTPServer653.exe
disclosure@vulncheck.com
http://www.coreftp.com/
disclosure@vulncheck.com
https://www.exploit-db.com/exploits/46532
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/core-ftp-build-653-pbsz-unauthenticated-de…
disclosure@vulncheck.com