Nuevo "exploit" para vulnerabilidad ASN.1

Fuente:
http://www.informationweek.com/stor...jsessionidFNEPLQARMMUQSNDBGCKHY?articleID700565

Hackers Circulate New Code For Exploiting Windows Feb. 17, 2004

The code targets systems that haven't been patched against the flaw in
Microsoft's Abstract Syntax Notation 1 library.
By Gregg Keizer, TechWeb News

Just days after Microsoft alerted users of a major vulnerability in
Windows, exploit code is widely circulating on the Internet, a
security expert said Tuesday.

The code targets systems that haven't been patched against the flaw in
Microsoft's Abstract Syntax Notation 1 (ANS.1) library, a
vulnerability that was discovered in July 2003 by eEye Digital
Security, but not made public until earlier this month.

The exploit code, first found on Feb. 14--four days after the
vulnerability was disclosed--is fully functional and can crash
compromised Windows machines, said Ken Dunham, director of malicious
code research at iDefense. By Tuesday, iDefense had spotted three
separate exploits for the ANS.1 vulnerability, all of them widespread
on multiple discussion groups and hacker Web sites.

"The widespread distribution of this new exploit code has
significantly increased the threat level for ASN.1 possible attacks,"
said Dunham. "It's far more likely that we will soon see hacking,
trojans, and worms emerge against this vulnerability now that exploit
code is widely available."

Although most large companies have already started to roll out patches
for the ANS.1 vulnerability and should wrap up the chore this week,
there will still be countless targets for the exploit code, said
Dunham.

The exploit code causes the Microsoft Local Security Authority
Subsystem process, run by LSASS.exe, to crash. It can be sent via
Server Message Blocks or NetBIOS sharing protocols listening on ports
445 or 139.


Breve Resumen:
Unos dias despues de que Microsoft alertara a los usuarios sobre una
vulnerabilidad IMPORTANTE en Windows, esta circulando por la red
Internet un nuevo "exploit". Por lo visto el parche contra la
vulnerabilidad de la biblioteca ASN.1 (Abstract Syntac Notation.1) de
Microsoft no esta del todo acabado, esta vulnerabilidad fue
descubierta en Julio de 2003 por la empresas de seguridad Digital
eEye.

El "Exploit" se encontro cuatro dias despues de que la vulnerabilidad
fuera hecha publica.

El "exploit" causa que el LSASS.exe (proceso local) se interrumpa.




Habla de otras muchas cosas, pero lo importante es que tengais un
cortafuegos instalado y estar al dia en las actualizaciones de
seguridad de vuestro proveedor.

Tambien como recomendacion un software antivirus instalado y
actualizado.




Ille Corvus. Hic et Nunc.

Meritorios de Filtrado (Kill-file):
jm tella llop (2003.10.25)