Apache HTTP Server up to 2.0.50 IPv6 apr-util denial of service

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

A vulnerability was found in Apache HTTP Server up to 2.0.50 (Web Server). It has been classified as critical. This affects an unknown part in the library apr-util of the component IPv6 Handler. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. The summary by CVE is:

Buffer overflow in Apache 2.0.50 and earlier allows local users to gain apache privileges via a .htaccess file that causes the overflow during expansion of environment variables.

The weakness was presented 09/15/2004 by Ulf Harnhammar with NISCC (Website). It is possible to read the advisory at uniras.gov.uk. This vulnerability is uniquely identified as CVE-2004-0747 since 07/26/2004. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 14766 (GLSA-200409-21 : Apache 2, mod_dav: Multiple vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks.

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at httpd.apache.org. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (17384) and Tenable (14766). See 844 for similar entry.

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  • end of life (old version)

CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 7.5
VulDB Temp Score: 6.5
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CVSSv2info

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Exploitinginfo

Class: Denial of service
CWE: CWE-404
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

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Nessus ID: 14766
Nessus Name: GLSA-200409-21 : Apache 2, mod_dav: Multiple vulnerabilities
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OpenVAS ID: 100172
OpenVAS Name: Apache Web Server Configuration File Environment Variable Local Buffer Overflow Vulnerability
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ATK: 236

Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Upgrade
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Patch: httpd.apache.org

Timelineinfo

07/26/2004 🔍
09/15/2004 +51 days 🔍
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09/16/2004 +0 days 🔍
09/16/2004 +0 days 🔍
09/17/2004 +1 days 🔍
09/21/2004 +4 days 🔍
10/20/2004 +29 days 🔍
03/09/2021 +5984 days 🔍

Sourcesinfo

Vendor: apache.org

Advisory: uniras.gov.uk
Researcher: Ulf Harnhammar
Organization: NISCC
Status: Confirmed

CVE: CVE-2004-0747 (🔍)
OVAL: 🔍

X-Force: 17384 - Apache HTTP Server environment variable configuration file buffer overflow, High Risk
SecurityTracker: 1011303 - Apache ap_resolve_env() Buffer Overflow in Reading Configuration Files May Let Local Users Gain Elevated Privileges
Vulnerability Center: 5434 - Buffer Overflow in Apache 2.0.50 and Earlier Enables Local Privileges via .htaccess File, Medium
SecurityFocus: 11182 - Apache Web Server Configuration File Environment Variable Local Buffer Overflow Vulnerability
Secunia: 12540 - Apache apr-util Library and Environment Variable Expansion Vulnerabilities, Moderately Critical
OSVDB: 9991 - Apache HTTP Server ap_resolve_env Environment Variable Local Overflow
Vupen: ADV-2009-1233

See also: 🔍

Entryinfo

Created: 09/16/2004 11:21
Updated: 03/09/2021 19:17
Changes: 09/16/2004 11:21 (103), 04/16/2019 15:10 (1), 03/09/2021 19:17 (3)
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