The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
None
C
There is no impact on the confidentiality of the system; the attacker does not gain the ability to read any data.
Integrity
None
I
There is no impact on the integrity of the system; the attacker does not gain the ability to modify any files or information on the target system.
Availability
Low
A
There is reduced performance or interruptions in resource availability. However, the attacker does not have the ability to completely prevent access to the resources or services; the impact is limited.
** Inge Henriksen Security Advisory - Full Disclosure Proof of Concept at http://ingehenriksen.blogspot.com/ **
Advisory Name:
Microsoft IIS Remote Denial of Service (DoS) .DLL Url exploit
Release Date:
16. Desember 2005
Vulnerable:
Microsoft® Internet Information Server® V5.1
Not vulnerable:
Microsoft® Internet Information Server® V5.0
Microsoft® Internet Information Server® V6.0
Severity:
High
Discovered by:
Inge Henriksen (inge.henriksen (at) booleansoft (dot) com [email concealed]) http://ingehenriksen.blogspot.com/
Vendor Status:
Notified 28. January 2005. No fix will be released until Microsoft® Windows® XP Service Pack 3
(Rumored due late 2006).
Description:
I have found that by doing a malformed anonymous HTTP request one can remotely crash the IIS service
process, inetinfo.exe, using just a simple tool like a web browser. The vulnerablity is only present
in folders with Execute Permissions set to Scripts & Executables, examples of vulnerable virtual
folders would be "<webroot>/_vti_bin" and the like.
Suggested solution:
Block all incoming URL's containing "~0", "~1", "~2", "~3", "~4", "~5", "~6", "~7", "~8", or "~9"
(Ignore quotes).
Full Disclosure Proof of Concept at http://ingehenriksen.blogspot.com/
This information is provided for TESTING and LEGAL RESEARCH purposes only. All trademarks used are properties of their respective owners. By visiting this website you agree to Terms of Use and Privacy Policy and Impressum