EXPLOITING EMBEDDED SYSTEMS THE SEQUEL!
Exploitation - CanSecWest
Exploitation - CanSecWest
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New Attack Classes• Exploitable NULL pointer vulnerabilities• This common wrapper returns a NULL pointer if passed 0• But what if 0x0 is mapped in memory??void *xmalloc(size_t amt){if (amt != 0) {void *block = malloc(amt);if (block == NULL) {fprintf(stderr, "out of memory\n");exit(EXIT_FAILURE);}return block;}return NULL;}Copyright © 2007 Juniper Networks, Inc. Proprietary and Confidential www.juniper.net 23
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