FreeBSD up to 9.2 Link access control

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in FreeBSD up to 9.2. The affected element is an unknown function of the component Link Handler. Executing a manipulation can lead to access control. This vulnerability appears as CVE-2013-5710. In addition, an exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in FreeBSD up to 9.2 (Operating System). It has been declared as problematic. This vulnerability affects an unknown part of the component Link Handler. 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, and integrity. CVE summarizes:

The nullfs implementation in sys/fs/nullfs/null_vnops.c in the kernel in FreeBSD 8.3 through 9.2 allows local users with certain permissions to bypass access restrictions via a hardlink in a nullfs instance to a file in a different instance.

The weakness was presented 09/10/2013 by Konstantin Belousov as confirmed mailinglist post (Bugtraq). The advisory is available at seclists.org. The public release was coordinated in cooperation with the vendor. This vulnerability was named CVE-2013-5710 since 09/06/2013. The exploitation appears to be easy. Local access is required to approach this attack. A single authentication is necessary for exploitation. Technical details are unknown but a public exploit is available. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

After immediately, there has been an exploit disclosed. It is possible to download the exploit at seclists.org. It is declared as functional. The vulnerability scanner Nessus provides a plugin with the ID 70263 (FreeBSD : FreeBSD -- Cross-mount links between nullfs(5) mounts (b72bad1c-20ed-11e3-be06-000c29ee3065)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks.

Upgrading to version 9.2-RC1-p2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at security.FreeBSD.org. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (86971), Tenable (70263), SecurityFocus (BID 62303†), OSVDB (97181†) and Secunia (SA54732†). See VDB-10257 for similar entry. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.4
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Functional
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 70263
Nessus Name: FreeBSD : FreeBSD -- Cross-mount links between nullfs(5) mounts (b72bad1c-20ed-11e3-be06-000c29ee3065)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 892769
OpenVAS Name: Debian Security Advisory DSA 2769-1 (kfreebsd-9 - privilege escalation/denial of service
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: FreeBSD 9.2-RC1-p2
Patch: security.FreeBSD.org

Timelineinfo

09/06/2013 🔍
09/10/2013 +3 days 🔍
09/10/2013 +0 days 🔍
09/10/2013 +0 days 🔍
09/10/2013 +0 days 🔍
09/10/2013 +0 days 🔍
09/10/2013 +0 days 🔍
09/13/2013 +3 days 🔍
09/23/2013 +10 days 🔍
09/30/2013 +7 days 🔍
10/02/2013 +2 days 🔍
05/24/2021 +2791 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: seclists.org
Researcher: Konstantin Belousov
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2013-5710 (🔍)
GCVE (CVE): GCVE-0-2013-5710
GCVE (VulDB): GCVE-100-10258
X-Force: 86971
SecurityFocus: 62303
Secunia: 54732 - FreeBSD nullfs Mount Handling Security Bypass Vulnerability, Less Critical
OSVDB: 97181
SecurityTracker: 1029015
Vulnerability Center: 41655 - FreeBSD 8.3-9.2 Local Bypass Restrictions via a Hardlink, Low

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

Entryinfo

Created: 09/13/2013 11:58
Updated: 05/24/2021 15:11
Changes: 09/13/2013 11:58 (83), 05/12/2017 09:03 (1), 05/24/2021 15:03 (3), 05/24/2021 15:05 (2), 05/24/2021 15:11 (1)
Complete: 🔍
Committer:
Cache ID: 216:A12:103

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