Apache-SSL 1.3.34 1.57 expandcert input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.6$0-$5k0.00

A vulnerability was found in Apache-SSL 1.3.34 1.57. It has been classified as critical. Affected is the function expandcert. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The ExpandCert function in Apache-SSL before apache_1.3.41+ssl_1.59 does not properly handle (1) / and (2) = characters in a Distinguished Name (DN) in a client certificate, which might allow remote attackers to bypass authentication via a crafted DN that triggers overwriting of environment variables.

The bug was discovered 04/02/2008. The weakness was presented 04/03/2008 by Alexander Klink with Cynops GmbH (Website). The advisory is available at securityfocus.com. This vulnerability is traded as CVE-2008-0555 since 02/01/2008. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details 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 1 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 31738 (Apache-SSL ExpandCert() Function Certificate Handling Arbitrary Environment Variables Manipulation), 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.

Upgrading to version 1.3.34 1.57 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (41618) and Tenable (31738).

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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Exploitinginfo

Class: Input validation
CWE: CWE-20
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

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EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 31738
Nessus Name: Apache-SSL ExpandCert() Function Certificate Handling Arbitrary Environment Variables Manipulation
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Apache-SSL 1.3.34 1.57

Timelineinfo

02/01/2008 🔍
04/02/2008 +61 days 🔍
04/02/2008 +0 days 🔍
04/02/2008 +0 days 🔍
04/03/2008 +1 days 🔍
04/03/2008 +0 days 🔍
04/03/2008 +0 days 🔍
04/03/2008 +0 days 🔍
04/07/2008 +4 days 🔍
03/16/2015 +2534 days 🔍
08/08/2019 +1606 days 🔍

Sourcesinfo

Advisory: securityfocus.com⛔
Researcher: Alexander Klink
Organization: Cynops GmbH
Status: Confirmed

CVE: CVE-2008-0555 (🔍)
X-Force: 41618
SecurityTracker: 1019784
Vulnerability Center: 18116 - Apache-SSL Authentication Bypass Vulnerability in the ExpandCert Function, High
SecurityFocus: 28576 - Apache-SSL Environment Variable Information Disclosure and Privilege Escalation Vulnerability
Secunia: 29644
OSVDB: 43997 - CVE-2008-0555 - Apache-SSL - Authentication Bypass Issue
Vupen: ADV-2008-1079

Entryinfo

Created: 03/16/2015 17:00
Updated: 08/08/2019 09:35
Changes: 03/16/2015 17:00 (59), 08/08/2019 09:35 (18)
Complete: 🔍

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