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
High
AC
The successful attack depends on the evasion or circumvention of security-enhancing techniques in place that would otherwise hinder the attack. These include: Evasion of exploit mitigation techniques. The attacker must have additional methods available to bypass security measures in place. For example, circumvention of address space randomization (ASLR) or data execution prevention must be performed for the attack to be successful. Obtaining target-specific secrets. The attacker must gather some target-specific secret before the attack can be successful. A secret is any piece of information that cannot be obtained through any amount of reconnaissance. To obtain the secret the attacker must perform additional attacks or break otherwise secure measures (e.g. knowledge of a secret key may be needed to break a crypto channel). This operation must be performed for each attacked target.
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.
Scope
S
An exploited vulnerability can affect resources beyond the security scope managed by the security authority that is managing the vulnerable component. This is often referred to as a 'privilege escalation,' where the attacker can use the exploited vulnerability to gain control of resources that were not intended or authorized.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
EEYEB-20051117A Apple QuickTime STSD Atom Heap Overflow
Release Date:
January 10, 2006
Date Reported:
November 17, 2005
Patch Development Time (In Days):
54 Days
Severity:
High (Code Execution)
Vendor:
Apple
Systems Affected:
Quicktime on Windows 2000
Quicktime on Windows XP
Quicktime on Mac OS X 10.3.9
Apple iTunes on Windows 2000
Apple iTunes on Windows XP
Apple iTunes on OS X 10.3.9
Overview:
eEye Digital Security has discovered a critical vulnerability in
QuickTime Player. The vulnerability allows a remote attacker to reliably
overwrite heap memory with user-controlled data and execute arbitrary
code in the context of the user who executed the player or application
hosting the QuickTime plug-in.
This specific flaw exists within the QuickTime.qts file which many
applications access QuickTime's functionality through. By specially
crafting atoms within a movie file, a direct heap overwrite is
triggered, and reliable code execution is then possible.
Technical Details:
Technical Description:
The code in QuickTime.qts responsible for the size of the Sample
Description Table entries from the 'stsd' atom in a QuickTime-format
movie on the heap. According to developer.apple.com, the format of the
Sample Description Atom is as follows:
Field Description
----------------------------------------------------------------
Size32-bit int
Data Format4 char code
Reserved6 bytes that must be 0
Data Reference Index 16-bit int
Hint Track Version 16-bit unsigned int
Last compatible hint track version 16-bit unsigned int
Max Packet Size32-bit int
Additional Data TableVariable
By setting the size of the Sample Description Table to a size of 00 15 -
00 D0 will cause a heap-based overflow. By supplying the "Last
compatible hint track version" field with the value of 00 05 - 00 09, an
insufficiently-sized heap block will be allocated, resulting in a
classic complete heap memory overwrite
during the RtlAllocateHeap() function and the attacker can control
memory with data taken from the filename of the .MOV file. This
vulnerability can be successfully exploited via an embedded media player
in an HTML page, email, or HTML link.
References
QuickTime: QuickTime File Format
http://developer.apple.com/documentation/QuickTime/QTFF/index.html
Protection:
Retina Network Security Scanner has been updated to identify this
vulnerability.
Vendor Status:
Apple has released a patch for this vulnerability. The patch is
available via the Updates section of the affected applications.
This vulnerability has been assigned the CVE identifier CVE-2005-4092.
Credit:
Discovery: Karl Lynn
Greetings:
0x41414141
Copyright (c) 1998-2006 eEye Digital Security
Permission is hereby granted for the redistribution of this alert
electronically. It is not to be edited in any way without express
consent of eEye. If you wish to reprint the whole or any part of this
alert in any other medium excluding electronic medium, please email
alert (at) eEye (dot) com [email concealed] for permission.
Disclaimer
The information within this paper may change without notice. Use of this
information constitutes acceptance for use in an AS IS condition. There
are no warranties, implied or express, with regard to this information.
In no event shall the author be liable for any direct or indirect
damages whatsoever arising out of or in connection with the use or
spread of this information. Any use of this information is at the user's
own risk.