Apache HTTP Server up to 1.0.1 set_var format string

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Apache HTTP Server up to 1.0.1. It has been rated as problematic. This issue affects the function set_var. This manipulation causes format string. This vulnerability is handled as CVE-2006-4154. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Apache HTTP Server up to 1.0.1 (Web Server). Affected by this vulnerability is the function set_var. The manipulation with an unknown input leads to a format string vulnerability. The CWE definition for the vulnerability is CWE-134. The product uses a function that accepts a format string as an argument, but the format string originates from an external source. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Format string vulnerability in the mod_tcl module 1.0 for Apache 2.x allows context-dependent attackers to execute arbitrary code via format string specifiers that are not properly handled in a set_var function call in (1) tcl_cmds.c and (2) tcl_core.c.

The bug was discovered 08/16/2006. The weakness was released 10/16/2006 by Sparfell with iDEFENSE Labs (Website). It is possible to read the advisory at labs.idefense.com. This vulnerability is known as CVE-2006-4154 since 08/16/2006. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 61 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 22915 (GLSA-200610-12 : Apache mod_tcl: Format string vulnerability), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 105728 (EOL/Obsolete Software: Apache HTTP Server 2.2.x).

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at tcl.apache.org. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability. Attack attempts may be identified with Snort ID 16021. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 8969.

The vulnerability is also documented in the databases at X-Force (29550), Tenable (22915), SecurityFocus (BID 20527†), OSVDB (29536†) and Secunia (SA22549†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Support

  • end of life (old version)

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.4

VulDB Base Score: 7.3
VulDB Temp Score: 6.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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Exploitinginfo

Class: Format string
CWE: CWE-134 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 22915
Nessus Name: GLSA-200610-12 : Apache mod_tcl: Format string vulnerability
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 57910
OpenVAS Name: Gentoo Security Advisory GLSA 200610-12 (mod_tcl)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Patch: tcl.apache.org

Snort ID: 16021
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

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

Timelineinfo

08/16/2006 🔍
08/16/2006 +0 days 🔍
10/13/2006 +58 days 🔍
10/13/2006 +0 days 🔍
10/14/2006 +1 days 🔍
10/16/2006 +2 days 🔍
10/16/2006 +0 days 🔍
10/16/2006 +0 days 🔍
10/16/2006 +0 days 🔍
10/17/2006 +0 days 🔍
10/24/2006 +7 days 🔍
10/25/2006 +1 days 🔍
12/22/2024 +6633 days 🔍

Sourcesinfo

Vendor: apache.org

Advisory: labs.idefense.com⛔
Researcher: Sparfell
Organization: iDEFENSE Labs
Status: Confirmed

CVE: CVE-2006-4154 (🔍)
GCVE (CVE): GCVE-0-2006-4154
GCVE (VulDB): GCVE-100-2611
CERT: 🔍
X-Force: 29550 - Apache mod_tcl set_var() format string, High Risk
SecurityFocus: 20527 - Apache Mod_TCL Remote Format String Vulnerability
Secunia: 22549 - Gentoo update for mod_tcl, Highly Critical
OSVDB: 29536 - Apache Tcl mod_tcl set_var Function Remote Format String
SecurityTracker: 1017062 - Apache mod_tcl Format String Bug in set_var() Function May Let Remote Users Execute Arbitrary Code
Vulnerability Center: 12900 - Apache HTTP Server mod_tcl Code Execution Vulnerability, High
Vupen: ADV-2006-4033

Entryinfo

Created: 10/17/2006 10:58
Updated: 12/22/2024 09:09
Changes: 10/17/2006 10:58 (96), 09/05/2019 13:35 (11), 03/13/2021 14:23 (2), 11/24/2024 22:44 (15), 12/22/2024 09:09 (2)
Complete: 🔍
Cache ID: 216:464:103

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

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