Apache HTTP Server up to 1.3.23 Log File Hostname authentication spoofing

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.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Apache HTTP Server up to 1.3.23. It has been classified as problematic. Affected by this vulnerability is an unknown functionality of the component Log File Handler. The manipulation of the argument Hostname leads to authentication spoofing. This vulnerability is referenced as CVE-2002-2103. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Apache HTTP Server up to 1.3.23 (Web Server). It has been rated as problematic. This issue affects an unknown code block of the component Log File Handler. The manipulation of the argument hostname with an unknown input leads to a authentication spoofing vulnerability. Using CWE to declare the problem leads to CWE-290. This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. Impacted is integrity. The summary by CVE is:

Apache before 1.3.24, when writing to the log file, records a spoofed hostname from the reverse lookup of an IP address, even when a double-reverse lookup fails, which allows remote attackers to hide the original source of activities.

The bug was discovered 03/25/2002. The weakness was published 12/31/2002 by Martin (Website). The advisory is shared at securityfocus.com. The identification of this vulnerability is CVE-2002-2103 since 08/05/2005. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 281 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 10579 (Apache Double-Reverse Lookup Log Entry Spoofing Vulnerability).

Upgrading to version 1.3.24 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (8629), SecurityFocus (BID 4358†), OSVDB (19769†) and Vulnerability Center (SBV-8767†). Similar entry is available at VDB-1652. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Web Server

Vendor

• Apache

Name

• HTTP Server

Version

• 1.3.0
• 1.3.1
• 1.3.2
• 1.3.3
• 1.3.4
• 1.3.5
• 1.3.6
• 1.3.7
• 1.3.8
• 1.3.9
• 1.3.10
• 1.3.11
• 1.3.12
• 1.3.13
• 1.3.14
• 1.3.15
• 1.3.16
• 1.3.17
• 1.3.18
• 1.3.19
• 1.3.20
• 1.3.21
• 1.3.22
• 1.3.23

License

• open-source

Support

• end of life (old version)

Website

• Vendor: https://www.apache.org/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Authentication spoofing
CWE: CWE-290 / CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: HTTP Server 1.3.24

Timelineinfo

03/25/2002 🔍
03/25/2002 +0 days 🔍
03/25/2002 +0 days 🔍
12/31/2002 +281 days 🔍
12/31/2002 +0 days 🔍
08/01/2005 +944 days 🔍
08/05/2005 +4 days 🔍
08/06/2014 +3288 days 🔍
08/30/2025 +4042 days 🔍

Sourcesinfo

Vendor: apache.org

Advisory: securityfocus.com⛔
Researcher: Martin
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2002-2103 (🔍)
GCVE (CVE): GCVE-0-2002-2103
GCVE (VulDB): GCVE-100-19745
X-Force: 8629
SecurityFocus: 4358 - Apache Double-Reverse Lookup Log Entry Spoofing Vulnerability
OSVDB: 19769 - Apache - DNS Spoofing of Log Entries
Vulnerability Center: 8767 - Spoofed Logging in Apache HTTP Server < 1.3.24 via Double Reversed DNS Lookups, Medium

See also: 🔍

Entryinfo

Created: 08/06/2014 10:20
Updated: 08/30/2025 11:19
Changes: 08/06/2014 10:20 (65), 06/07/2019 21:03 (3), 08/30/2025 11:19 (20)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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