Mensajes

Hola a todos.
Tengo una pregunta amigos.

Es necesario pasar por la universidad y estudiar la informática  para ser un buen administrador de redes.?

Hace dos años estaba estudiando grado medio de sistemas y redes informática. Un dia por probar mis conocimientos quise entrar en los servidores del instituto desde el PC personal de mi clase tuve exito pero los profesores  me pillaron y sabian que fui yo. Debido a ese me expulsaron del instituto y ahora no me reciben en ningu  instituto y me gustaria seguir estudiando. Mi pregunta es... es necesario ir a la universidad  para ser un administrador de redes  ? No me aceptan en ningun instituto y la unica manera es aprender aleatoriamente por Internet.

Gracias

Que tipo de ataque realizaste? Es de suma importancia pues así a otros no le sucede lo mismo, saludos.

Efectivamente, puedes basarte en eso si es que el valor es representado en números, en caso que no, solo has un scan con increase value o decrease value en Cheat Engine, saludos y suerte.

Sirve de algo?

http://foro.elhacker.net/buscador-t394168.0.html

[Next SEH]

Hola .:UND3R:. antes de nada gracias por responder,

Mira como bien dices cuando implementamos una función que haga uso de excepciones que manejen estas son introducidas en la pila de forma de estructura Exception Registration Record, los cuales podemos verlos en la pila entre las variables locales y el registro EBP salvado de la función anterior, estos registros tienen la siguiente estructura:

• Next SEH(Puntero al siguiente SEH)
• SEH Handler(Puntero al manejador de excepciones propiamente dicho)

Ahora bien cuando se genera una excepción se crea un prologo/epilogo como el contexto que hace uso una función para sus variables locales, ret adrress... esto lo podemos ver si hacemos click derecho sobre el SEH handler y en el menú contextual seleccionamos la opción que dice "Follow in Disassembler" veremos en la parte superior izquierda donde empieza el prologo del Exception Handler.

Aquí viene mi duda, este contexto es lo que se llama Excetion Dispatcher Stack?
Es una pila aparte o es un contexto como el que suele hacer uso una función normal?

Lo que si que se es que esta fuera del entorno de pila de programa principal(e aquí mi gran duda).

El segundo campo apunta a una dirección X y al parecer esta dirección depende de la programación del manejador, ya que como exploit writer podrías modificar el segundo campo para que apunte a la pila o darte cuenta que el manejador por defecto de las aplicaciones apunta a una dirección con comienzo 0x7. Ahora como lo dices claro que está fuera de la pila (normalmente) pero si haces una escritura del stack, la dirección debería apuntar a una de la pila que controles.

Todo esto te lo comento bajo mi supuestos pero no estoy seguro 100% debido a que desconozco de los conceptos pero si lo que te he comentado es verídico, ahora si esos conceptos se refieren a lo que te comento, excelente, si no, sigamos buscando.

Saludos

Lo que ocurre es que SEH Structured exception handler, es la estructura que se utiliza para manejar las excepciones de un ejecutable, si mal no me equivoco, leyendo rápidamente cuando este manejador es instalado por hilos, para entender el manejador de excepciones debemos entender la estructura ERR:

Exception registration record:
- Puntero a la siguiente estructura ERR.
- Puntero al manejador de excepciones.

Esta estructura se encuentra en la pila, por lo menos eso es apreciable en los depuradores, además lo podemos corroborar por el rango, además de ello para obtener el SEH del marco actual, podemos obtenerlo a través de TIB:
https://es.wikipedia.org/wiki/Win32_Thread_Information_Block

específicamente en:
fs:[0]


En cuanto a los conceptos que mencionas no estoy muy seguro a que se refiere pero a podrías darnos ejemplos de su contexto, saludos.



Aquí unos apuntes que encontré:

Tipos de manejador de excepciones:

Por proceso:
SetUnhandledExceptionFilter
Devuelve la dirección en donde retornará un programa cuando ocurra una excepción
siempre y cuando este no esté siendo depurado y no posea un SEH propio instalado

Por thread:
Este manejador de excepciones devuelve la dirección en donde retornará un programa
cuando ocurra una excepción, este SEH solo es instalado en thread's y no en todo el programa

para instalar un Manejador de excepciones por Thread
se debe localizar la tabla TIB Thread Information Block
una vez localizada nos enfocaremos en el primer valor de la tabla ERR(exception registration record) contiene el actual manejador de excepciones SEH (Structured Exception Handling)
dentro de ella contiene dos valores
1-puntero hacia el siguiente SEH (si el programa no tiene instalado uno este nos mostrará FFFFFF ya que es el genérico)
2-address en donde se redirigirá el programa al haber una excepción

Para instalar un SEH propio

se debe empujar (push) el valor hacia donde se dirigirá el programa en caso de una excepción y el puntero a la anterior SEH

push xxx
push fs:[0]

y modificar el valor de fs:[0] por el SEH actual
mov fs:[0],esp

Para desinstalar:
pop fs:[0] (saca el primer valor del stack y lo guarda en fs:[0])
add esp,4 (si no se le suma a esp el valor 4, el stack quedará apuntando al segundo valor que se empujó cuando se instaló el manejador de excepciones)

Sé que no suple tus dudas pero quizás pueda orientarte en algo, saludos.

Excelente aporte compañero, una introducción de los enlaces precisas, saludos y por favor sigue documentando lo que vayas encontrando, saludos.

offtopic: Inmmunity debugger es un mod de Olly, no?

Es el código de fuente de Olly modificado por la empresa (creo que es empresa) imunity, la gran ventaja es que posee intrgración de script en python 

Empieza por aprender a utilizar el buscador del foro, te darás cuenta que esta pregunta ha sido realizada 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cantidad de veces.

Que mala noticia  , ViejoMajara era un usuarios esforzado, increíble, muy destacado por sus ganas de querer aprender y nunca rendirse, esperamos verlo de nuevo con alguna duda o hazaña de su aprendizaje, mucha fuerza y envíale saludos de mi parte.

No puedo sentirme más feliz de ViejoMajara, ya que pese a su edad sin importar prejuicios, este usuario estaba aplicando una ciencia bien rebuscada pero sin rendirse 

Excelente tool, buen aporte