Lynis up to 2.4.x Test Symlink Temporary access control

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.
6.4$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Lynis up to 2.4.x. Affected by this issue is some unknown functionality of the component Test Handler. The manipulation as part of Symlink results in access control (Temporary). This vulnerability is cataloged as CVE-2017-8108. The attack must be initiated from a local position. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in Lynis up to 2.4.x. Affected is an unknown code block of the component Test Handler. The manipulation as part of a Symlink leads to a access control vulnerability (Temporary). CWE is classifying the issue as CWE-264. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Unspecified tests in Lynis before 2.5.0 allow local users to write to arbitrary files or possibly gain privileges via a symlink attack on a temporary file.

The bug was discovered 06/07/2017. The weakness was shared 06/08/2017 by Michael Scherer (Website). The advisory is available at lists.fedoraproject.org. This vulnerability is traded as CVE-2017-8108 since 04/25/2017. The exploitability is told to be easy. Local access is required to approach this attack. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

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 101000 (Amazon Linux AMI : lynis (ALAS-2017-847)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Amazon Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 351018 (Amazon Linux Security Advisory for lynis: ALAS-2017-847).

Upgrading to version 2.5.0 eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (101000) and SecurityFocus (BID 99288†). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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

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

NVD Base Score: 🔍

Exploitinginfo

Name: Temporary
Class: Access control / Temporary
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 101000
Nessus Name: Amazon Linux AMI : lynis (ALAS-2017-847)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Lynis 2.5.0

Timelineinfo

04/25/2017 🔍
06/07/2017 +43 days 🔍
06/08/2017 +1 days 🔍
06/08/2017 +0 days 🔍
06/08/2017 +0 days 🔍
06/22/2017 +14 days 🔍
06/23/2017 +1 days 🔍
06/27/2017 +4 days 🔍
08/23/2024 +2614 days 🔍

Sourcesinfo

Advisory: FEDORA-2017-8d625a8d2b
Researcher: Michael Scherer
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-8108 (🔍)
GCVE (CVE): GCVE-0-2017-8108
GCVE (VulDB): GCVE-100-102114
SecurityFocus: 99288 - CISOfy Lynis CVE-2017-8108 Symlink Local Privilege Escalation Vulnerability

Entryinfo

Created: 06/08/2017 23:27
Updated: 08/23/2024 13:21
Changes: 06/08/2017 23:27 (71), 10/14/2019 18:32 (5), 12/08/2022 09:23 (5), 08/23/2024 13:21 (16)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you want to use VulDB in your project?

Use the official API to access entries easily!