wu-ftpd 2.6.1/2.6.2 wu_fnmatch ls memory corruption

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

Summaryinfo

A vulnerability classified as critical has been found in wu-ftpd 2.6.1/2.6.2. This affects the function wu_fnmatch. Performing a manipulation of the argument ls with the input *** results in memory corruption. This vulnerability is known as CVE-2005-0256. Remote exploitation of the attack is possible. Furthermore, an exploit is available. It is suggested to use restrictive firewalling.

Detailsinfo

A vulnerability, which was classified as critical, was found in wu-ftpd 2.6.1/2.6.2 (File Transfer Software). This affects the function wu_fnmatch. The manipulation of the argument ls with the input value *** leads to a memory corruption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. The summary by CVE is:

The wu_fnmatch function in wu_fnmatch.c in wu-ftpd 2.6.1 and 2.6.2 allows remote attackers to cause a denial of service (CPU exhaustion by recursion) via a glob pattern with a large number of * (wildcard) characters, as demonstrated using the dir command.

The bug was discovered 02/09/2005. The weakness was published 02/25/2005 by Adam Zabrocki (pi3 and pi3ki31ny) (Website). The advisory is shared at idefense.com. This vulnerability is uniquely identified as CVE-2005-0256 since 02/09/2005. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known.

The exploit is shared for download at idefense.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 16 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 21552 (HP-UX PHNE_34544 : HP-UX Running wu-ftpd Remote Denial of Service (DoS) (HPSBUX02110 SSRT061110 rev.1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family HP-UX Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 27373 (WU-FTPD wu_fnmatch() Function File Globbing Denial Of Service Vulnerability).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at wu-ftpd.org.It is possible to mitigate the weakness by firewalling . The best possible mitigation is suggested to be applying a restrictive firewalling. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (842), Tenable (21552), OSVDB (14203†), Secunia (SA19561†) and SecurityTracker (ID 1013305†). Similar entry is available at VDB-1499. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

Version

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

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
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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Nessus ID: 21552
Nessus Name: HP-UX PHNE_34544 : HP-UX Running wu-ftpd Remote Denial of Service (DoS) (HPSBUX02110 SSRT061110 rev.1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 53532
OpenVAS Name: Debian Security Advisory DSA 705-1 (wu-ftpd)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: wu-ftpd.org

Timelineinfo

02/09/2005 🔍
02/09/2005 +0 days 🔍
02/25/2005 +16 days 🔍
02/25/2005 +0 days 🔍
02/27/2005 +2 days 🔍
03/02/2005 +2 days 🔍
04/04/2005 +33 days 🔍
05/02/2005 +28 days 🔍
04/07/2006 +340 days 🔍
05/13/2006 +36 days 🔍
07/05/2025 +6993 days 🔍

Sourcesinfo

Advisory: idefense.com⛔
Researcher: Adam Zabrocki (pi3, pi3ki31ny)
Status: Confirmed

CVE: CVE-2005-0256 (🔍)
GCVE (CVE): GCVE-0-2005-0256
GCVE (VulDB): GCVE-100-1245

OVAL: 🔍

Secunia: 19561 - HP-UX update for wu-ftpd, Less Critical
OSVDB: 14203 - WU-FTPD wu_fnmatch() Function File Globbing Remote DoS
SecurityTracker: 1013305
Vulnerability Center: 7450
Vupen: ADV-2006-1271

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

Entryinfo

Created: 03/02/2005 13:37
Updated: 07/05/2025 16:24
Changes: 03/02/2005 13:37 (95), 07/01/2019 16:16 (1), 06/27/2024 11:18 (17), 07/05/2025 16:24 (9)
Complete: 🔍
Cache ID: 216:ABD:103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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