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
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.
Networksecurity.fi Security Advisory (21-12-2005)
Title: dtSearch DUNZIP32.dll Buffer Overflow Vulnerability
Criticality: High (3/3)
Affected software: dtSearch versions prior than 7.20 Build 7136
Author: Juha-Matti Laurio
Date: 21th December, 2005
Advisory ID: Networksecurity.fi Security Advisory (21-12-2005) (#15)
CVE reference: CVE-2004-1094
- From the vendor:
"Instantly Search Terabytes of Text
The dtSearch product line can instantly search terabytes of text across
a desktop, network, Internet or Intranet site."
- Description:
dtSearch document search system is confirmed as affected to remote type
buffer overflow vulnerability.
The vulnerability is caused due to a boundary error in a 3rd-party
compression library's (DUNZIP32.dll) remarkable old, vulnerable version
used when handling packed .ZIP documents. InnerMedia DynaZip compression
library mentioned is responsible for indexing and displaying operations.
This can be exploited to cause a buffer overflow via a specially crafted
zipped document. When a specially crafted .zip document containing a
file with an overly long filename (a file name or files inside a ZIP) is
opened, the application will crash and the attacker may be able to
execute arbitrary code on user's system (see US-CERT VU#582498
reference).
- Detailed description:
Affected DynaZip library examined is version from December, 2002, file
version 5.0.0.2. According to InnerMedia company versions 5.00.03 and
prior are affected.
The following remarkable old file was copied to C:Program
FilesdtSearchbin directory during an installation process when tested:
File name: dunzip32.dll
Date stamp: 6th December, 2002 04:05PM
File version: 5.0.0.2
Description: DynaZIP-32 Multi-Threading UnZIP DLL
NOTE: Dunzip32.dll is being installed into the same directory as the
application executable of dtSearch Engine if dtSearch has been installed
on end-users' machines. If the situation is as described, updating of
the libary on end-users' machines by applying a software update is also
needed.
>From US-CERT VU#582498:
"Impact:
If a remote attacker can persuade a user to access a specially crafted
zip file, the attacker may be able to execute arbitrary code on that
user's system possibly with elevated privileges."
- Affected versions:
The vulnerability has been confirmed in dtSearch Desktop with Spider
version 7.10 (Build 7045). Other versions may also be affected.
The newest dtSearch version from 6.x product line is dtSearch 6.5 Build 6608.
All earlier versions (vendor's Web pages list versions 1.x to 5.25) are
probably affected as well.
- OS:
Microsoft Windows (Win 95/98/ME/NT/2000/XP/2003/.NET)
Tests was done with Microsoft Windows XP Professional SP2 and Microsoft
Windows 2000 Professional SP4 fully patched.
- Solution status:
Vendor has issued a patch shipped with immune library version 5.00.07.
It can be obtained by downloading a patch from:
http://www.dtsearch.com/download.html#upgrades
- Software:
dtSearch 7.x
dtSearch 6.x
http://www.dtsearch.com/PLF_desktop.html (Desktop with Spider)
Vendor and vendor Home Page:
dtSearch Corp.
http://www.dtsearch.com
Vendor product Web page:
http://www.dtsearch.com/PLF_desktop.html (Desktop with Spider)
- Solution:
Apply a patch 7.20 Build 7136 (version number 7.20.7136.1):
http://www.dtsearch.com/download.html#upgrades
- CVE information:
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2004-1094 on 20th December, 2005 to this issue. This is a
candidate for inclusion in the CVE list (http://cve.mitre.org ), which
standardizes names for security problems.
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1094
The CVSS (Common Vulnerability Scoring System) severity level metric of
issue CVE-2004-1094: 10 (High)
- References:
US-CERT VU#582498:
"InnerMedia DynaZip library vulnerable to buffer overflow via long file names"
http://www.kb.cert.org/vuls/id/582498
>From the vulnerability note:
"Users are encouraged to contact their software vendors if they suspect
they are vulnerable."
Upgrade information for version 6.x or earlier:
http://support.dtsearch.com/faq/dts0201.htm
Credit information:
This vulnerability was researched by Juha-Matti Laurio,
Networksecurity.fi (Finland).
Timeline:
12-Oct-2005 - Vulnerability researched and confirmed
05-Nov-2005 - Vendor was contacted
05-Nov-2005 - Vendor's reply, vendor informed about upcoming, fixed
version and timeline
06-Nov-2005 - Vendor issues a patch, detailed research
20-Dec-2005 - CVE information submission sent to Mitre.org
20-Dec-2005 - Mitre.org assigns CVE-2004-1094
21-Dec-2005 - Security companies and several CERT units contacted
23-Dec-2005 - Public disclosure
Networksecurity.fi Weblog (Finnish language):
http://networksecurity.typepad.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