strongSwan up to 5.3.3 eap-mschapv2 Plugin input validation

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.0$0-$5k0.00

Summaryinfo

A vulnerability was found in strongSwan up to 5.3.3. It has been classified as problematic. This issue affects some unknown processing of the component eap-mschapv2 Plugin. The manipulation leads to input validation. This vulnerability is traded as CVE-2015-8023. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in strongSwan up to 5.3.3 (Network Encryption Software) and classified as critical. This issue affects an unknown code block of the component eap-mschapv2 Plugin. The manipulation with an unknown input 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. The summary by CVE is:

The server implementation of the EAP-MSCHAPv2 protocol in the eap-mschapv2 plugin in strongSwan 4.2.12 through 5.x before 5.3.4 does not properly validate local state, which allows remote attackers to bypass authentication via an empty Success message in response to an initial Challenge message.

The weakness was shared 11/18/2015 (Website). It is possible to read the advisory at strongswan.org. The identification of this vulnerability is CVE-2015-8023 since 10/29/2015. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 86953 (Debian DLA-345-1 : strongswan security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 168211 (SUSE Enterprise Linux Security update for strongswan (SUSE-SU-2015:2183-1)).

Upgrading to version 5.3.4 eliminates this vulnerability. A possible mitigation has been published 1 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (86953), SecurityFocus (BID 84947†) and Vulnerability Center (SBV-54597†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

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

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

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

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 86953
Nessus Name: Debian DLA-345-1 : strongswan security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703398
OpenVAS Name: Debian Security Advisory DSA 3398-1 (strongswan - security update)
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: 🔍

Upgrade: strongSwan 5.3.4

Timelineinfo

10/29/2015 🔍
11/18/2015 +20 days 🔍
11/18/2015 +0 days 🔍
11/18/2015 +0 days 🔍
11/18/2015 +0 days 🔍
11/19/2015 +1 days 🔍
11/19/2015 +0 days 🔍
11/20/2015 +1 days 🔍
11/25/2015 +5 days 🔍
11/12/2024 +3275 days 🔍

Sourcesinfo

Advisory: USN-2811-1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-8023 (🔍)
GCVE (CVE): GCVE-0-2015-8023
GCVE (VulDB): GCVE-100-79259

OVAL: 🔍

SecurityFocus: 84947 - strongSwan CVE-2015-8023 Authentication Bypass Vulnerability
Vulnerability Center: 54597 - StrongSwan 4.2.12 through 5.3.3 Remote Security Bypass via an Empty Success Message, Medium

Entryinfo

Created: 11/19/2015 10:29
Updated: 11/12/2024 06:28
Changes: 11/19/2015 10:29 (63), 04/20/2018 09:15 (12), 06/27/2022 15:06 (3), 11/12/2024 06:28 (24)
Complete: 🔍
Cache ID: 216::103

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

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Might our Artificial Intelligence support you?

Check our Alexa App!