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.
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
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.
Macromedia Flash Player Improper Memory Access Vulnerability
Release Date:
November 4, 2005
Date Reported:
June 27, 2005
Severity:
High
Vendor:
Macromedia
Systems Affected:
Macromedia Flash 6 (on all Windows platforms)
Macromedia Flash 7 (on all Windows platforms)
Overview:
eEye Digital Security has discovered a vulnerability in Macromedia Flash
Player versions 6 and 7 that will allow an attacker to run arbitrary
code in the context of the logged in user. An array boundary condition
may be violated by a malicious SWF file in order to redirect execution
into attacker-supplied data.
Technical Details:
The vulnerable code exists in Flash.ocx, which embodies the code
responsible for playing back SWF files. One function maintains a large,
256-element table of function pointers on the stack, and uses a frame
type identifier read from the SWF file as an index into the array,
without enforcing the array boundaries. The following disassembly
depicts the affected code:
.text:1002714F mov eax, [esi+0CA4h] ; type number
.text:10027155 mov ecx, [esi+94h] ; base of table
.text:1002715B lea eax, [ecx+eax*8] ; get element address
.text:1002715E mov ecx, [eax] ;
Although the index is not validated, its value is elsewhere restricted
to be at most 0x8000, so the attacker can cause a function pointer to be
retrieved from memory up to roughly 64KB after the base of the table on
the stack. Typically this range will include heap memory, so by
planting specific data on the heap, the attacker can very easily control
the exact value of the function pointer. Reliable exploitation using
this technique within Internet Explorer has been demonstrated by eEye
Digital Security.
Protection:
Retina Network Security Scanner has been updated to identify this
vulnerability.
Blink - Endpoint Vulnerability Prevention - protects from this
vulnerability.
Vendor Status:
Macromedia has addressed this issue in the following security bulletin;
http://www.macromedia.com/devnet/security/security_zone/mpsb05-07.html
This vulnerability has been assigned the CVE identifier CAN-2005-2628
and OSVDB ID 18825.
Greetings:
Thanks Derek and and eEye guys help me wrote this advisory. Greeting
xfocus guys and venustech lab guys.
Credit:
Fang Xing
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