VDB-8480 · CVE-2013-1957 · OSVDB 92592

Linux Kernel up to 3.8.5 Access Control fs/namespace.c clone_mnt access control

CVSS Meta Temp Score
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CTI Interest Score
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3.6$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Linux Kernel up to 3.8.5. Affected is the function clone_mnt of the file fs/namespace.c of the component Access Control Handler. Such manipulation leads to access control. This vulnerability is referenced as CVE-2013-1957. Furthermore, an exploit is available. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 3.8.5 (Operating System). Affected by this issue is the function clone_mnt of the file fs/namespace.c of the component Access Control Handler. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is integrity. CVE summarizes:

The clone_mnt function in fs/namespace.c in the Linux kernel before 3.8.6 does not properly restrict changes to the MNT_READONLY flag, which allows local users to bypass an intended read-only property of a filesystem by leveraging a separate mount namespace.

The weakness was published 03/27/2013 by Andy Lutomirski as not defined mailinglist post (oss-sec). The advisory is shared for download at openwall.com. This vulnerability is handled as CVE-2013-1957 since 02/19/2013. The exploitation is known to be easy. The attack needs to be approached locally. No form of authentication is required for exploitation. Technical details as well as a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1068.

After 3 weeks, there has been an exploit disclosed. It is declared as proof-of-concept. As 0-day the estimated underground price was around $25k-$100k.

Applying the patch 132c94e31b8bca8ea921f9f96a57d684fa4ae0a9 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at OSVDB (92592†). Similar entries are available at VDB-8479 and VDB-8481. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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Vendor

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.0
VulDB Meta Temp Score: 3.6

VulDB Base Score: 4.0
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: 132c94e31b8bca8ea921f9f96a57d684fa4ae0a9

Timelineinfo

02/19/2013 🔍
03/27/2013 +36 days 🔍
03/27/2013 +0 days 🔍
04/13/2013 +17 days 🔍
04/23/2013 +10 days 🔍
04/24/2013 +1 days 🔍
05/05/2018 +1837 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: openwall.com
Researcher: Andy Lutomirski
Status: Not defined
Confirmation: 🔍

CVE: CVE-2013-1957 (🔍)
GCVE (CVE): GCVE-0-2013-1957
GCVE (VulDB): GCVE-100-8480
OSVDB: 92592

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

Entryinfo

Created: 04/23/2013 12:22
Updated: 05/05/2018 18:09
Changes: 04/23/2013 12:22 (59), 05/05/2018 18:09 (6)
Complete: 🔍
Committer: olku
Cache ID: 216:489:103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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