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robinbhandari FTP Remote Denial Of Service

robinbhandari FTP Remote Denial Of Service
Posted Mar 12, 2019
Authored by x90c

robinbhandari FTP suffers from a denial of service vulnerability.

tags | advisory, denial of service
advisories | CVE-2019-9668
MD5 | 36e625ec902f1e4fc7ac8cf059b020d4

robinbhandari FTP Remote Denial Of Service

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Title: CVE-2019-9668 robinbhandari FTP remote DoS vulnerability

Vulnerable:
- https://github.com/rovinbhandari/FTP

Description:
robinbhandari is a open source tiny ftp server/client in github.com.
it has a remote DoS vulnerability in a 'put' command.

Timeline:
2019-03-11 CVE-2019-9668 robinbhandari FTP remote DoS vulnerability.
2019-03-10 my personal site advisory published.
2019-03-09 request CVE to mitre. (Report).
2019-02-27 vulnerability found.

Details:
hacker can set packet struct's datalen field variable. which is recv size from server side file transferring.
then If set 0xffff(size of unsigned short) to datalen, put ./file then server side error occured and
server will be closed.

Vulnerable code:
--------------------
FTP/file_transfer_functions.c
[...]
void receive_file(struct packet* hp, struct packet* data, int sfd, FILE* f)
{
[...]
int x;
int i = 0, j = 0;

// (1) recved packet from ftp client.
if((x = recv(sfd, data, size_packet, 0)) <= 0)
er("recv()", x);
j++;

// (2) hp = struct packet * fields parsing.
hp = ntohp(data);
//printpacket(hp, HP);
while(hp->type == DATA) // (3) If DATA type then enter here..
{
i += fwrite(hp->buffer, 1, hp->datalen, f); // (4) x90c:: hacker can set hp->datalen, then server daemon error then remote DoS result occured.

if((x = recv(sfd, data, size_packet, 0)) <= 0)
er("recv()", x);
j++;
hp = ntohp(data);
//printpacket(hp, HP);
}
[...]
--------------------

PoC:
we can change client_ftp.c to compile.

Credit:
x90c <x90chacker@gmail.com> - http://www.x90chacker.org.

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