Linux Kernel up to 3.14.6 kernel/capability.c inode_capable access control

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 3.14.6. It has been classified as problematic. Affected by this vulnerability is the function inode_capable of the file kernel/capability.c. This manipulation causes access control. This vulnerability is registered as CVE-2014-4014. Furthermore, an exploit is available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 3.14.6 (Operating System) and classified as critical. Affected by this vulnerability is the function inode_capable of the file kernel/capability.c. 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 confidentiality, integrity, and availability.

The weakness was published 06/10/2014 by Andy Lutomirski as Linux kernel user namespace bug as confirmed mailinglist post (oss-sec). The advisory is shared at openwall.com. The public release has been coordinated with Linux. This vulnerability is known as CVE-2014-4014 since 06/09/2014. An attack has to be approached locally. The requirement for exploitation is a single authentication. Technical details and also a public exploit are known. MITRE ATT&CK project uses the attack technique T1068 for this issue. The advisory points out:

Depending on configuration, this may be usable to escalate privileges.

A public exploit has been developed by Vitaly Nikolenko in ANSI C and been published 2 weeks after the advisory. It is possible to download the exploit at securityfocus.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 76133 (Fedora 20 : kernel-3.14.8-200.fc20 (2014-7430)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350361 (Amazon Linux Security Advisory for kernel: ALAS-2014-368). The advisory illustrates:

A cursory inspection of my Fedora box suggests that it is not vulnerable to the obvious way to exploit this bug.

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability. The function inode_capable() got replaced by capable_wrt_inode_uidgid().

The vulnerability is also documented in the databases at X-Force (93767), Exploit-DB (33824), Tenable (76133), SecurityFocus (BID 67988†) and Secunia (SA59220†). Similar entries are available at VDB-47321 and VDB-65956. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.8
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Vitaly Nikolenko
Programming Language: 🔍
Download: 🔍

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Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 76133
Nessus Name: Fedora 20 : kernel-3.14.8-200.fc20 (2014-7430)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 800909
OpenVAS Name: Fedora Update for kernel FEDORA-2015-5024
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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Timelineinfo

06/09/2014 🔍
06/10/2014 +1 days 🔍
06/10/2014 +0 days 🔍
06/10/2014 +0 days 🔍
06/10/2014 +0 days 🔍
06/11/2014 +1 days 🔍
06/13/2014 +2 days 🔍
06/16/2014 +3 days 🔍
06/19/2014 +3 days 🔍
06/21/2014 +2 days 🔍
06/21/2014 +0 days 🔍
06/23/2014 +2 days 🔍
06/24/2014 +1 days 🔍
11/25/2024 +3807 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: Linux kernel user namespace bug
Researcher: Andy Lutomirski
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2014-4014 (🔍)
GCVE (CVE): GCVE-0-2014-4014
GCVE (VulDB): GCVE-100-13585

OVAL: 🔍

X-Force: 93767 - Linux Kernel inode_capable() privilege escalation, High Risk
SecurityFocus: 67988 - Linux Kernel CVE-2014-4014 Local Privilege Escalation Vulnerability
Secunia: 59220 - Linux Kernel Inode Capabilities Privilege Escalation Vulnerability, Less Critical
SecurityTracker: 1030394 - Linux Kernel inode_capable() Incorrect Capability Check Lets Local Users Gain Elevated Privileges
Vulnerability Center: 45103 - Linux Kernel Before 3.14.8 Local Security Bypass due to an Error in the Capabilities Implementation, Medium

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 06/13/2014 10:15
Updated: 11/25/2024 06:44
Changes: 06/13/2014 10:15 (87), 05/31/2017 09:02 (18), 06/22/2021 20:19 (3), 06/22/2021 20:27 (1), 11/25/2024 06:44 (19)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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