Red Hat Enterprise Linux 6/7 fuse Filesystem Application input validation

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k0.00

A vulnerability was found in Red Hat Enterprise Linux 6/7 (Operating System). It has been declared as problematic. Affected by this vulnerability is an unknown code block of the component fuse Filesystem. The manipulation as part of a Application leads to a input validation vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. The summary by CVE is:

A non-privileged user is able to mount a fuse filesystem on RHEL 6 or 7 and crash a system if an application punches a hole in a file that does not end aligned to a page boundary.

The bug was discovered 12/05/2017. The weakness was released 12/07/2017 as Bug 1520893 as not defined bug report (Bugzilla). It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is known as CVE-2017-15121 since 10/08/2017. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of 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 1 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 109380 (CentOS 7 : kernel (CESA-2018:1062)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 236711 (Red Hat Update for kernel-rt (RHSA-2018:0676)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 6 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (109380). Entries connected to this vulnerability are available at 106966, 110043, 110109 and 111673.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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Exploitinginfo

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

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 109380
Nessus Name: CentOS 7 : kernel (CESA-2018:1062)
Nessus File: 🔍
Nessus Risk: 🔍
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Qualys ID: 🔍
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
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Timelineinfo

10/08/2017 🔍
12/05/2017 +58 days 🔍
12/05/2017 +0 days 🔍
12/06/2017 +1 days 🔍
12/07/2017 +1 days 🔍
12/07/2017 +0 days 🔍
04/27/2018 +141 days 🔍
04/27/2018 +0 days 🔍
01/26/2021 +1005 days 🔍

Sourcesinfo

Vendor: redhat.com

Advisory: Bug 1520893
Researcher: Miklos Szeredi
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-15121 (🔍)
SecurityFocus: 102128 - Linux Kernel CVE-2017-15121 Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 12/07/2017 09:21
Updated: 01/26/2021 06:25
Changes: 12/07/2017 09:21 (70), 12/12/2019 16:25 (10), 01/26/2021 06:25 (3)
Complete: 🔍

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