Linux Kernel up to 4.3.3 fs/overlayfs/inode.c ovl_setattr access control

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 4.3.3. It has been rated as problematic. Affected is the function ovl_setattr of the file fs/overlayfs/inode.c. Performing a manipulation results in access control. This vulnerability is reported as CVE-2015-8660. The attack requires a local approach. Moreover, an exploit is present. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 4.3.3 (Operating System). This affects the function ovl_setattr of the file fs/overlayfs/inode.c. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge distinct setattr operations, which allows local users to bypass intended access restrictions and modify the attributes of arbitrary overlay files via a crafted application.

The weakness was disclosed 12/28/2015 (Website). It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2015-8660 since 12/23/2015. Attacking locally is a requirement. The successful exploitation requires a authentication. Technical details and a public exploit are known. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

A public exploit has been developed by halfdog and been published 3 weeks after the advisory. The exploit is shared for download at exploit-db.com. It is declared as highly functional. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 87757 (Ubuntu 15.04 : linux vulnerability (USN-2857-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157235 (Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2016-3593)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (39230), Tenable (87757), SecurityFocus (BID 79671†) and Vulnerability Center (SBV-55395†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.7
VulDB Meta Temp Score: 6.6

VulDB Base Score: 6.7
VulDB Temp Score: 6.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.7
NVD Vector: 🔍

CVSSv2info

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Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Highly functional
Author: halfdog
Download: 🔍

EPSS Score: 🔍
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Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 87757
Nessus Name: Ubuntu 15.04 : linux vulnerability (USN-2857-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 881932
OpenVAS Name: CentOS Update for kernel CESA-2016:1539 centos7
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

MetaSploit ID: overlayfs_priv_esc.rb
MetaSploit Name: Overlayfs Privilege Escalation
MetaSploit File: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
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Exploit Delay Time: 🔍

Patch: git.kernel.org

Timelineinfo

12/23/2015 🔍
12/23/2015 +0 days 🔍
12/23/2015 +0 days 🔍
12/25/2015 +2 days 🔍
12/28/2015 +3 days 🔍
12/28/2015 +0 days 🔍
12/29/2015 +1 days 🔍
01/05/2016 +7 days 🔍
01/06/2016 +1 days 🔍
01/12/2016 +6 days 🔍
01/12/2016 +0 days 🔍
11/25/2024 +3240 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-2857-1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-8660 (🔍)
GCVE (CVE): GCVE-0-2015-8660
GCVE (VulDB): GCVE-100-79947
SecurityFocus: 79671 - Linux Kernel 'fs/overlayfs/inode.c' Local Privilege Escalation Vulnerability
SecurityTracker: 1034548
Vulnerability Center: 55395 - Linux kernel Local Privilege Escalation in the Ovl_Setattr Function- CVE-2015-8660, Medium

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

Entryinfo

Created: 12/29/2015 13:26
Updated: 11/25/2024 01:23
Changes: 12/29/2015 13:26 (63), 06/19/2018 21:08 (34), 07/01/2022 23:50 (5), 07/02/2022 00:00 (1), 11/25/2024 01:23 (14)
Complete: 🔍
Cache ID: 216::103

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