Microsoft Windows 2000/XP RPC Request NetrWkstaUserEnum maxlen resource management

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability has been found in Microsoft Windows 2000/XP and classified as critical. The affected element is the function NetrWkstaUserEnum of the component RPC Request Handler. The manipulation of the argument maxlen leads to resource management. This vulnerability is traded as CVE-2006-6723. Furthermore, there is an exploit available. It is recommended to apply restrictive firewalling.

Detailsinfo

A vulnerability was found in Microsoft Windows 2000/XP (Operating System). It has been rated as critical. This issue affects the function NetrWkstaUserEnum of the component RPC Request Handler. The manipulation of the argument maxlen with an unknown input leads to a resource management vulnerability. Using CWE to declare the problem leads to CWE-399. Impacted is availability. The summary by CVE is:

The Workstation service in Microsoft Windows 2000 SP4 and XP SP2 allows remote attackers to cause a denial of service (memory consumption) via a large maxlen value in an NetrWkstaUserEnum RPC request.

The bug was discovered 12/25/2006. The weakness was shared 12/26/2006 by h07 (Website). The advisory is shared at exploit-db.com. The identification of this vulnerability is CVE-2006-6723 since 12/26/2006. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known.

After before and not just, there has been an exploit disclosed. The exploit is available at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 2504 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 90375 (Windows Workstation Service NetrWkstaUserEnum Denial of Service - Zero Day).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at windowsupdate.microsoft.com.Addressing this vulnerability is possible by firewalling . The best possible mitigation is suggested to be applying a restrictive firewalling. Attack attempts may be identified with Snort ID 12489. In this case the pattern |00 00 00 00| is used for detection. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 8559.

The vulnerability is also documented in the databases at X-Force (31085), Exploit-DB (3013), OSVDB (32445†), Secunia (SA23487†) and SecurityTracker (ID 1017441†). The entry VDB-2788 is related to this item. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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License

Support

  • end of life (old version)

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.9
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
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VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

0-Day Time: 🔍

Patch: windowsupdate.microsoft.com

Snort ID: 12489
Snort Message: NETBIOS DCERPC NCACN-IP-TCP wkssvc NetrWkstaGetInfo attempt
Snort Pattern: 🔍

Suricata ID: 2003236
Suricata Class: 🔍
Suricata Message: 🔍

TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

ISS Proventia IPS: 🔍
PaloAlto IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

02/17/2000 🔍
12/25/2006 +2503 days 🔍
12/25/2006 +0 days 🔍
12/26/2006 +1 days 🔍
12/26/2006 +0 days 🔍
12/26/2006 +0 days 🔍
12/26/2006 +0 days 🔍
12/26/2006 +0 days 🔍
12/26/2006 +0 days 🔍
12/26/2006 +0 days 🔍
12/31/2006 +4 days 🔍
01/03/2007 +3 days 🔍
06/14/2025 +6737 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: exploit-db.com
Researcher: h07
Status: Confirmed

CVE: CVE-2006-6723 (🔍)
GCVE (CVE): GCVE-0-2006-6723
GCVE (VulDB): GCVE-100-2789
X-Force: 31085
Secunia: 23487 - Windows Workstation Service NetrWkstaUserEnum Denial of Service, Not Critical
OSVDB: 32445 - Microsoft Windows Workstation Service NetrWkstaUserEnum RPC Request DoS
SecurityTracker: 1017441
Vulnerability Center: 13729 - Microsoft Windows 2000 SP4 and XP SP2 Workstation Service Remote Denial of Service, High
Vupen: ADV-2006-5142

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 01/03/2007 09:22
Updated: 06/14/2025 23:03
Changes: 01/03/2007 09:22 (99), 07/13/2019 09:06 (2), 06/14/2025 23:03 (24)
Complete: 🔍
Cache ID: 216:D3B:103

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