CVE-2012-4424

Desbordamiento de búfer basada en la pila en string/strcoll_l.c en GNU C Library (aka glibc o libc6) 2.17 y anteriores que permite a atacantes dependientes del contexto provocar una denegación de servicio (caída) o posible ejecución de código arbitrario a través de una cadena larga que provoca un fallo del malloc y el uso de la función alloca.

Integer overflow in string/strcoll_l.c in the GNU C Library (aka glibc or libc6) 2.17 and earlier allows context-dependent attackers to cause a denial of service or possibly execute arbitrary code via a long string, which triggers a heap-based buffer overflow. Stack-based buffer overflow in string/strcoll_l.c in the GNU C Library 2.17 and earlier allows context-dependent attackers to cause a denial of service or possibly execute arbitrary code via a long string that triggers a malloc failure and use of the alloca function. Multiple integer overflows in malloc/malloc.c in the GNU C Library (aka glibc or libc6) 2.18 and earlier allow context-dependent attackers to cause a denial of service via a large value to the aligned_alloc functions. A stack overflow flaw, which led to a denial of service (application crash), was found in the way glibc's getaddrinfo() function processed certain requests when called with AF_INET6. A similar flaw to this affects AF_INET6 rather than AF_UNSPEC. The PTR_MANGLE implementation in the GNU C Library (aka glibc or libc6) 2.4, 2.17, and earlier, and Embedded GLIBC does not initialize the random value for the pointer guard, which makes it easier for context- dependent attackers to control execution flow by leveraging a buffer-overflow vulnerability in an application and using the known zero value pointer guard to calculate a pointer address. The updated packages have been patched to correct these issues.