Apache HTTP Server up to 2.2.32/2.4.25 ap_get_basic_auth_pw improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.19

Summaryinfo

A vulnerability classified as critical has been found in Apache HTTP Server up to 2.2.32/2.4.25. This issue affects the function ap_get_basic_auth_pw. The manipulation leads to improper authentication. This vulnerability is traded as CVE-2017-3167. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Apache HTTP Server up to 2.2.32/2.4.25 (Web Server). It has been rated as critical. This issue affects the function ap_get_basic_auth_pw. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In Apache httpd 2.2.x before 2.2.33 and 2.4.x before 2.4.26, use of the ap_get_basic_auth_pw() by third-party modules outside of the authentication phase may lead to authentication requirements being bypassed.

The bug was discovered 06/19/2017. The weakness was shared 06/20/2017 (Website). The advisory is shared at lists.apache.org. The identification of this vulnerability is CVE-2017-3167 since 12/05/2016. 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 scanner Nessus provides a plugin with the ID 100995 (Apache 2.2.x < 2.2.33-dev / 2.4.x < 2.4.26 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Web Servers and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 351051 (Amazon Linux Security Advisory for httpd24: ALAS-2017-863).

Upgrading to version 2.4.26 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (100995) and SecurityFocus (BID 99135†). The entries VDB-21337, VDB-63776, VDB-90671 and VDB-96545 are related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Vendor

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 100995
Nessus Name: Apache 2.2.x < 2.2.33-dev / 2.4.x < 2.4.26 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703896
OpenVAS Name: Debian Security Advisory DSA 3896-1 (apache2 - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: HTTP Server 2.4.26

Timelineinfo

12/05/2016 🔍
06/19/2017 +196 days 🔍
06/19/2017 +0 days 🔍
06/19/2017 +0 days 🔍
06/19/2017 +0 days 🔍
06/20/2017 +1 days 🔍
06/20/2017 +0 days 🔍
06/22/2017 +2 days 🔍
11/04/2025 +3057 days 🔍

Sourcesinfo

Vendor: apache.org

Advisory: RHSA-2017:2478
Researcher: Emmanuel Dreyfus
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-3167 (🔍)
GCVE (CVE): GCVE-0-2017-3167
GCVE (VulDB): GCVE-100-102689

OVAL: 🔍

SecurityFocus: 99135 - Apache HTTP Server CVE-2017-3167 Authentication Bypass Vulnerability
SecurityTracker: 1038711

See also: 🔍

Entryinfo

Created: 06/20/2017 11:45
Updated: 11/04/2025 17:38
Changes: 06/20/2017 11:45 (76), 10/19/2019 10:41 (5), 12/29/2020 10:22 (2), 12/29/2020 10:27 (1), 12/08/2022 16:29 (3), 11/04/2025 17:38 (17)
Complete: 🔍
Cache ID: 216::103

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

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