Apache HTTP Server up to 2.2.33/2.4.26 mod_auth_digest Authorization Header input validation

CVSS Meta Temp Score
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CTI Interest Score
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8.0$0-$5k0.00

A vulnerability, which was classified as critical, has been found in Apache HTTP Server up to 2.2.33/2.4.26 (Web Server). Affected by this issue is an unknown code of the component mod_auth_digest. The manipulation as part of a Authorization Header leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In Apache httpd before 2.2.34 and 2.4.x before 2.4.27, the value placeholder in [Proxy-]Authorization headers of type 'Digest' was not initialized or reset before or between successive key=value assignments by mod_auth_digest. Providing an initial key with no '=' assignment could reflect the stale value of uninitialized pool memory used by the prior request, leading to leakage of potentially confidential information, and a segfault in other cases resulting in denial of service.

The bug was discovered 07/11/2017. The weakness was published 07/13/2017 by Robert Swiecki with Google Security Team (Website). The advisory is shared for download at lists.apache.org. The public release has been coordinated with the vendor. This vulnerability is handled as CVE-2017-9788 since 06/21/2017. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 101787 (Apache 2.2.x < 2.2.34 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 157536 (Oracle Enterprise Linux Security Update for httpd (ELSA-2017-2478)).

Upgrading to version 2.2.34 or 2.4.27 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 vulnerability database at Tenable (101787). seclists.org is providing further details. Similar entry is available at 108938.

Productinfo

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Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 8.2
VulDB Meta Temp Score: 8.0

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

NVD Base Score: 9.1
NVD Vector: 🔍

CVSSv2info

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

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Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 101787
Nessus Name: Apache 2.2.x < 2.2.34 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703913
OpenVAS Name: Debian Security Advisory DSA 3913-1 (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 2.2.34/2.4.27

Timelineinfo

06/21/2017 🔍
07/11/2017 +20 days 🔍
07/11/2017 +0 days 🔍
07/11/2017 +0 days 🔍
07/13/2017 +2 days 🔍
07/13/2017 +0 days 🔍
07/14/2017 +1 days 🔍
07/18/2017 +4 days 🔍
12/12/2022 +1973 days 🔍

Sourcesinfo

Vendor: apache.org

Advisory: RHSA-2017:2478
Researcher: Robert Swiecki
Organization: Google Security Team
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2017-9788 (🔍)
OVAL: 🔍

SecurityTracker: 1038906
SecurityFocus: 99569 - Apache HTTP Server CVE-2017-9788 Memory Corruption Vulnerability

Misc.: 🔍
See also: 🔍

Entryinfo

Created: 07/14/2017 10:41
Updated: 12/12/2022 12:45
Changes: 07/14/2017 10:41 (83), 10/31/2019 13:35 (4), 01/01/2021 11:40 (3), 12/12/2022 12:45 (3)
Complete: 🔍
Cache ID: 18:6F5:103

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