wftpd up to 3.23 SIZE memory corruption

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.7	$0-$5k	0.00

Summaryinfo

A vulnerability was found in wftpd up to 3.23. It has been classified as critical. This affects the function SIZE. The manipulation leads to memory corruption. This vulnerability is listed as CVE-2006-4318. The attack may be initiated remotely. In addition, an exploit is available. It is recommended that the affected component be replaced with an alternative.

Detailsinfo

A vulnerability was found in wftpd up to 3.23 (File Transfer Software). It has been rated as critical. This issue affects the function SIZE. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Buffer overflow in WFTPD Server 3.23 allows remote attackers to execute arbitrary code via long SIZE commands.

The weakness was presented 08/23/2006 by h07 (Website). It is possible to read the advisory at exploit-db.com. The identification of this vulnerability is CVE-2006-4318 since 08/23/2006. The attack may be initiated remotely. The requirement for exploitation is a simple authentication. Technical details as well as a public exploit are known.

A public exploit has been developed by h07 and been published even before and not after the advisory. The exploit is available at exploit-db.com. It is declared as highly functional. The vulnerability was handled as a non-public zero-day exploit for at least 2 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 86749 (WFTPD Server Multiple Buffer Overflow Vulnerabilities).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at wftpd.com. The problem might be mitigated by replacing the product with as an alternative. The best possible mitigation is suggested to be establishing an alternative product. Attack attempts may be identified with Snort ID 8415. In this case the pattern SIZE is used for detection. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 19901.

The vulnerability is also documented in the databases at X-Force (28523), Exploit-DB (2233), SecurityFocus (BID 19617†), OSVDB (28134†) and Secunia (SA21547†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• File Transfer Software

Name

• wftpd

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17
• 3.18
• 3.19
• 3.20
• 3.21
• 3.22
• 3.23

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.7

VulDB Base Score: 5.0
VulDB Temp Score: 4.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional
Author: h07
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Qualys ID: 🔍
Qualys Name: 🔍

MetaSploit ID: wftpd_size.rb
MetaSploit Name: Texas Imperial Software WFTPD 3.23 SIZE Overflow
MetaSploit File: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Alternative
Status: 🔍

0-Day Time: 🔍

Patch: wftpd.com

Snort ID: 8415
Snort Message: FTP SIZE overflow attempt
Snort Pattern: 🔍
TippingPoint: 🔍
SourceFire IPS: 🔍
PaloAlto IPS: 🔍

Timelineinfo

08/21/2006 🔍
08/21/2006 +0 days 🔍
08/21/2006 +0 days 🔍
08/21/2006 +0 days 🔍
08/23/2006 +2 days 🔍
08/23/2006 +0 days 🔍
08/23/2006 +0 days 🔍
08/23/2006 +0 days 🔍
08/23/2006 +0 days 🔍
08/23/2006 +0 days 🔍
08/24/2006 +0 days 🔍
08/29/2006 +5 days 🔍
06/16/2025 +6866 days 🔍

Sourcesinfo

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

CVE: CVE-2006-4318 (🔍)
GCVE (CVE): GCVE-0-2006-4318
GCVE (VulDB): GCVE-100-2483
X-Force: 28523 - WFTPD SIZE buffer overflow, High Risk
SecurityFocus: 19617 - WFTPD Server Multiple Buffer Overflow Vulnerabilities
Secunia: 21547 - WFTPD Server/Pro Server Pathname Handling Buffer Overflow, Moderately Critical
OSVDB: 28134 - Windows NT FTP Server (WFTP) Server SIZE Command Remote Overflow
SecurityTracker: 1016723 - WFTPD Buffer Overflow in SIZE Command Lets Remote Authenticated Users Execute Arbitrary Code
Vulnerability Center: 12602 - WFTPD Server Buffer Overflow Allows Remote Code Execution via Long SIZE Commands, Critical
Vupen: ADV-2006-3357

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

Entryinfo

Created: 08/24/2006 18:46
Updated: 06/16/2025 14:15
Changes: 08/24/2006 18:46 (93), 06/07/2017 14:55 (8), 07/15/2024 10:14 (17), 06/16/2025 14:15 (7)
Complete: 🔍
Cache ID: 216:659:103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

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