fuse up to 2.9.3-14 fusermount LIBMOUNT_MTAB File access control

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in fuse up to 2.9.3-14. Impacted is an unknown function of the component fusermount. Performing a manipulation of the argument LIBMOUNT_MTAB as part of Environment Variable results in access control (File). This vulnerability is reported as CVE-2015-3202. Moreover, an exploit is present. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in fuse up to 2.9.3-14. This affects some unknown processing of the component fusermount. The manipulation of the argument LIBMOUNT_MTAB as part of a Environment Variable leads to a access control vulnerability (File). 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:

fusermount in FUSE before 2.9.3-15 does not properly clear the environment before invoking (1) mount or (2) umount as root, which allows local users to write to arbitrary files via a crafted LIBMOUNT_MTAB environment variable that is used by mount's debugging feature.

The weakness was disclosed 07/02/2015 by Tavis Ormandy (Website). The advisory is shared at twitter.com. This vulnerability is uniquely identified as CVE-2015-3202 since 04/10/2015. An attack has to be approached locally. Required for exploitation is a authentication. Technical details and a public exploit are known. MITRE ATT&CK project uses the attack technique T1068 for this issue.

A public exploit has been developed by Tavis Ormandy and been published before and not just after the advisory. The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 40 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 83819 (Debian DLA-226-2 : ntfs-3g regression update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 167914 (SUSE Enterprise Linux Security update for FUSE (SUSE-SU-2015:1024-1)).

Upgrading to version 2.9.3-15 eliminates this vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (37089), Tenable (83819), SecurityFocus (BID 74765†) and Vulnerability Center (SBV-50750†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
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

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

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Tavis Ormandy
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 83819
Nessus Name: Debian DLA-226-2 : ntfs-3g regression update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 703266
OpenVAS Name: Debian Security Advisory DSA 3266-1 (fuse - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: fuse 2.9.3-15

Timelineinfo

01/01/2012 🔍
04/10/2015 +1195 days 🔍
05/21/2015 +41 days 🔍
05/23/2015 +2 days 🔍
05/23/2015 +0 days 🔍
06/30/2015 +38 days 🔍
07/02/2015 +2 days 🔍
07/02/2015 +0 days 🔍
07/03/2015 +1 days 🔍
11/26/2024 +3434 days 🔍

Sourcesinfo

Advisory: USN-2617-1
Researcher: Tavis Ormandy
Status: Confirmed

CVE: CVE-2015-3202 (🔍)
GCVE (CVE): GCVE-0-2015-3202
GCVE (VulDB): GCVE-100-76257

OVAL: 🔍

SecurityFocus: 74765 - FUSE CVE-2015-3202 Local Privilege Escalation Vulnerability
SecurityTracker: 1032386
Vulnerability Center: 50750 - FUSE Local File System Write due to Improper Sanitize of Environment before Executing Mount Commands, Low

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

Entryinfo

Created: 07/03/2015 10:32
Updated: 11/26/2024 04:13
Changes: 07/03/2015 10:32 (66), 07/02/2017 12:03 (12), 05/23/2022 07:40 (4), 05/23/2022 07:45 (1), 06/09/2024 09:13 (15), 11/26/2024 04:13 (6)
Complete: 🔍
Cache ID: 216::103

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

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