Chrony up to 3.5.0 Startup /var/run/chrony link following

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Chrony up to 3.5.0. The affected element is an unknown function of the file /var/run/chrony of the component Startup. The manipulation results in link following. This vulnerability was named CVE-2020-14367. The attack needs to be approached locally. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Chrony up to 3.5.0. It has been classified as critical. Affected is an unknown function of the file /var/run/chrony of the component Startup. The manipulation with an unknown input leads to a link following vulnerability. CWE is classifying the issue as CWE-59. The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A flaw was found in chrony versions before 3.5.1 when creating the PID file under the /var/run/chrony folder. The file is created during chronyd startup while still running as the root user, and when it's opened for writing, chronyd does not check for an existing symbolic link with the same file name. This flaw allows an attacker with privileged access to create a symlink with the default PID file name pointing to any destination file in the system, resulting in data loss and a denial of service due to the path traversal.

The weakness was presented 08/24/2020 (Website). The advisory is shared for download at lists.fedoraproject.org. This vulnerability is traded as CVE-2020-14367 since 06/17/2020. The attack needs to be approached locally. The successful exploitation requires a authentication. There are known technical details, but no exploit is available.

Upgrading to version 3.5.1 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.0
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: Link following
CWE: CWE-59
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

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: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Chrony 3.5.1

Timelineinfo

06/17/2020 🔍
08/24/2020 +68 days 🔍
08/24/2020 +0 days 🔍
08/24/2020 +0 days 🔍

Sourcesinfo

Advisory: lists.fedoraproject.org
Status: Not defined

CVE: CVE-2020-14367 (🔍)
GCVE (CVE): GCVE-0-2020-14367
GCVE (VulDB): GCVE-100-160188

Entryinfo

Created: 08/24/2020 20:12
Updated: 08/24/2020 20:17
Changes: 08/24/2020 20:12 (40), 08/24/2020 20:17 (17)
Complete: 🔍
Cache ID: 216::103

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