Kubernetes up to 1.9.3 File Permission link following

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Kubernetes up to 1.9.3. It has been rated as critical. This issue affects some unknown processing of the component File Permission. This manipulation causes link following. This vulnerability is registered as CVE-2017-1002101. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Kubernetes up to 1.9.3 (Virtualization Software). It has been declared as critical. Affected by this vulnerability is an unknown function of the component File Permission. The manipulation with an unknown input leads to a link following vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In Kubernetes versions 1.3.x, 1.4.x, 1.5.x, 1.6.x and prior to versions 1.7.14, 1.8.9 and 1.9.4 containers using subpath volume mounts with any volume type (including non-privileged pods, subject to file permissions) can access files/directories outside of the volume, including the host's filesystem.

The bug was discovered 03/04/2018. The weakness was published 03/13/2018 (GitHub Repository). It is possible to read the advisory at github.com. This vulnerability is known as CVE-2017-1002101 since 12/07/2017. The exploitation appears to be easy. The attack can be launched remotely. The successful exploitation requires a single authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 9 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 109704 (Fedora 27 : kubernetes (2018-16c8fdf9b8)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157671 (Oracle Enterprise Linux Security Update for kubernetes (ELSA-2018-4061)).

Upgrading to version 1.7.14, 1.8.9 or 1.9.4 eliminates this vulnerability. A possible mitigation has been published 3 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (109704). Similar entry is available at VDB-114416. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.0

VulDB Base Score: 7.4
VulDB Temp Score: 6.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.6
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: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 109704
Nessus Name: Fedora 27 : kubernetes (2018-16c8fdf9b8)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 64437
OpenVAS Name: Fedora Update for kubernetes FEDORA-2018-9b965c4eed
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: Kubernetes 1.7.14/1.8.9/1.9.4

Timelineinfo

12/07/2017 🔍
03/04/2018 +87 days 🔍
03/13/2018 +9 days 🔍
03/13/2018 +0 days 🔍
03/14/2018 +1 days 🔍
05/11/2018 +58 days 🔍
05/11/2018 +0 days 🔍
02/21/2023 +1747 days 🔍

Sourcesinfo

Product: github.com

Advisory: FEDORA-2018-16c8fdf9b8
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-1002101 (🔍)
GCVE (CVE): GCVE-0-2017-1002101
GCVE (VulDB): GCVE-100-114415
See also: 🔍

Entryinfo

Created: 03/14/2018 07:39
Updated: 02/21/2023 12:56
Changes: 03/14/2018 07:39 (74), 01/12/2020 17:55 (3), 02/21/2023 12:48 (4), 02/21/2023 12:56 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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