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Zalewski vuelve a alertar sobre problemas de seguridad en Firefox |
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Enviado el Martes, 20 febrero a las 10:33:42 por pirata |
 Michal Zalewski se dio a conocer durante 2006 por su trabajo a la hora de poner a prueba la seguridad de los distintos navegadores.
Ha descubierto varias vulnerabilidades tanto en Internet Explorer como Firefox,
dedicándose con especial hincapié en desafiar a este último navegador, al que ha
sabido buscarle las cosquillas. Entre otros fallos, los torpedos de Zalewski
(una serie de exploits que provocaban que el navegador dejase de responder) han
podido con el código de Firefox en varias ocasiones incluso después de crear
actualizaciones.En esta última semana (poco después de que se hicieran
públicas otras vulnerabilidades en Firefox), Zalewski ha vuelto a anunciar
varios errores de diseño que considera constituyen serios problemas de
seguridad.
El primer problema se basa en la forma en la que Firefox maneja la escritura
en la propiedad DOM location.hostname. Esto permite crear un script que
modificaría su valor con datos que serían normalmente aceptados como nombres de
host válidos cuando se interpreta una URL. Se pone como ejemplo un ataque basado
en la cadena x00. El resolvedor DNS y otras partes del código lo interpretan
como el final de una cadena mientras que las cadenas de las variables DOM no.
Según el ejemplo del propio Zalewski, evil.comx00foo.example.com sería
considerado por el código como parte del dominio example.com mientras que las
peticiones irían a parar a evil.com y éste sería capaz de modificar las cookies
de la página legítima. Parece que ya existe parche para este fallo pero aún no
se ha hecho público.
Existe otro problema relativamente de menor consideración, pero que según el
propio Zalewski merece la pena hacer notar. Se trata de un fallo de diseño por
el que un script podría abrir la URL about:blank en una nueva pestaña. Esto
permitiría al script interactuar con este documento como si se tratase de una
página en el mismo dominio, lo que incluye inyección HTLM. Según Zalewski esto
sería perfecto para perpetrar ataques phishing. Este fallo permite a un atacante
eludir también una solución a un error anterior que se pensaba totalmente
corregido. El problema también afecta a Microsoft Internet Explorer 7, pero sólo
si la opción "Permitir a páginas abrir ventanas sin barras de estado o
dirección" está marcada. Para facilitar todavía más las cosas a los phishers, a
principios de febrero se descubrió un problema en Firefox que permitía a una
página fraudulenta eludir el control antiphishing del programa con sólo añadir
una barra "/" al final de la URL.
Zalewski se queja además de otro "terrible" error de diseño que comparten
estos navegadores y del que se tiene constancia desde 2004. Las notificaciones
de seguridad que aparecen en la parte superior de las ventanas pueden ser
trivialmente falsificadas porque se sitúan en una zona accesible por scripts.
Este error todavía está ahí.
Parece que Zalewski se podría erigir como un "nuevo" Guninski. Georgi
Guninski, desde finales de los 90 hasta bien entrada la nueva década, descubrió
decenas de errores de seguridad en el navegador Internet Explorer (su
"especialidad") y otros muchos programas.
Así la situación, hasta que los errores queden corregidos, se recomienda
utilizar extensiones como NoScript o hacer uso de las zonas de seguridad de
Internet Explorer.
Más Información:
Firefox Phishing Protection Bypass Vulnerability
http://www.securiteam.com/securitynews/5MP0320KKK.html
Firefox Popup Blocker Allows Reading Arbitrary Local Files
http://www.securiteam.com/securitynews/5JP051FKKE.html
Firefox + popup blocker + XMLHttpRequest + srand() = oops
http://archives.neohapsis.com/archives/fulldisclosure/2007-02/0103.html
Firefox: serious cookie stealing / same-domain bypass vulnerability
http://lists.grok.org.uk/pipermail/full-disclosure/2007-February/052447.html
Firefox focus stealing vulnerability (possibly other browsers)
http://lists.grok.org.uk/pipermail/full-disclosure/2007-February/052333.html
Firefox: about:blank is phisher's best friend
http://seclists.org/bugtraq/2007/Feb/0323.html
Fuente: IBLNews
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