fscrypt up to 0.2.4 pam_fscrypt 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.
6.5$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in fscrypt up to 0.2.4. The impacted element is an unknown function of the component pam_fscrypt Module. Executing a manipulation can lead to access control. This vulnerability is handled as CVE-2018-6558. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in fscrypt up to 0.2.4 and classified as critical. This vulnerability affects an unknown part of the component pam_fscrypt Module. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect integrity, and availability. CVE summarizes:

The pam_fscrypt module in fscrypt before 0.2.4 may incorrectly restore primary and supplementary group IDs to the values associated with the root user, which allows attackers to gain privileges via a successful login through certain applications that use Linux-PAM (aka pam).

The bug was discovered 01/23/2018. The weakness was released 08/23/2018 (Website). The advisory is shared for download at github.com. This vulnerability was named CVE-2018-6558 since 02/01/2018. The attack can be initiated remotely. A single authentication is necessary for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability was handled as a non-public zero-day exploit for at least 212 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

VulDB Base Score: 6.5
VulDB Temp Score: 6.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
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: Access control
CWE: CWE-264
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

01/23/2018 🔍
02/01/2018 +9 days 🔍
08/23/2018 +202 days 🔍
08/23/2018 +0 days 🔍
08/24/2018 +1 days 🔍
05/04/2023 +1714 days 🔍

Sourcesinfo

Advisory: 3022c1603d968c22f147b4a2c49c4637dd1be91b
Status: Not defined

CVE: CVE-2018-6558 (🔍)
GCVE (CVE): GCVE-0-2018-6558
GCVE (VulDB): GCVE-100-123196

Entryinfo

Created: 08/24/2018 08:13
Updated: 05/04/2023 12:24
Changes: 08/24/2018 08:13 (55), 03/17/2020 20:22 (1), 05/04/2023 12:24 (4)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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