BSD Libc up to 10.2.6 realpath off-by-one

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in BSD Libc. This issue affects the function realpath. Executing a manipulation can lead to off-by-one. This vulnerability is tracked as CVE-2003-0466. The attack can be launched remotely. Moreover, an exploit is present.

Detailsinfo

A vulnerability was found in BSD Libc. It has been declared as critical. This vulnerability affects the function realpath. The manipulation with an unknown input leads to a off-by-one vulnerability. The CWE definition for the vulnerability is CWE-193. A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 07/31/2003 by Wojciech Purczynski and Janusz Niewiadomski with isec.pl (Website). The advisory is available at isec.pl. This vulnerability was named CVE-2003-0466. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known.

A public exploit has been developed in Perl and been published 2 weeks after the advisory. It is possible to download the exploit at downloads.securityfocus.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 16907 (HP-UX PHNE_29462 : s700_800 11.22 ftpd(1M) and ftp(1) patch), which helps to determine the existence of the flaw in a target environment. It is assigned to the family HP-UX Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 27200 (WU-FTPD FB_RealPath Off-By-One Buffer Overflow Vulnerability).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Attack attempts may be identified with Snort ID 2389.

The vulnerability is also documented in the databases at X-Force (12785), Exploit-DB (22976), Tenable (16907), SecurityFocus (BID 8315†) and OSVDB (6602†). The entries VDB-217 and VDB-218 are pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Off-by-one
CWE: CWE-193 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 16907
Nessus Name: HP-UX PHNE_29462 : s700_800 11.22 ftpd(1M) and ftp(1) patch
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 53646
OpenVAS Name: Debian Security Advisory DSA 357-1 (wu-ftpd)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍
Snort ID: 2389
Snort Message: PROTOCOL-FTP RNTO overflow attempt
Snort Class: 🔍

Suricata ID: 2102391
Suricata Class: 🔍
Suricata Message: 🔍

Timelineinfo

06/26/2003 🔍
07/31/2003 +35 days 🔍
07/31/2003 +0 days 🔍
08/14/2003 +14 days 🔍
08/27/2003 +12 days 🔍
06/04/2004 +282 days 🔍
04/11/2016 +4328 days 🔍
08/13/2025 +3411 days 🔍

Sourcesinfo

Advisory: isec.pl
Researcher: Wojciech Purczynski, Janusz Niewiadomski
Organization: isec.pl
Status: Not defined

CVE: CVE-2003-0466 (🔍)
GCVE (CVE): GCVE-0-2003-0466
GCVE (VulDB): GCVE-100-82042

OVAL: 🔍

CERT: 🔍
X-Force: 12785
SecurityFocus: 8315 - Multiple Vendor C Library realpath() Off-By-One Buffer Overflow Vulnerability
Secunia: 9535
OSVDB: 6602 - Multiple BSD libc realpath() Off-by-one Overflow
Vulnerability Center: 1678

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

Entryinfo

Created: 04/11/2016 22:41
Updated: 08/13/2025 20:22
Changes: 04/11/2016 22:41 (66), 02/15/2019 13:53 (11), 07/13/2022 13:04 (3), 07/13/2022 13:12 (1), 06/18/2024 00:10 (16), 09/02/2024 15:13 (3), 12/26/2024 13:13 (3), 08/13/2025 20:22 (3)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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