Security restrictions bypass in libfuse

Published: 2018-07-30

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2018-10906
CWE-ID	CWE-264
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	libfuse Universal components / Libraries / Libraries used by multiple products
Vendor	libfuse

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Security restrictions bypass

EUVDB-ID: #VU14103

Risk: Low

CVSSv3.1: 6.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-10906

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to insufficient access and privileges controls. A remote attacker can mount a FUSE file system with the 'allow_other' mount option regardless of whether 'user_allow_other' is set in the fuse configuration when SELinux is active, trick them into accessing files on that file system, bypass security restrictions and possibly cause the service to crash.

Mitigation

Update to version 3.2.5.

Vulnerable software versions

libfuse: 2.9.8 - 3.2.4

External links

http://github.com/libfuse/libfuse/commit/28bdae3d113ef479c1660a581ef720cdc33bf466
http://github.com/libfuse/libfuse/commit/5018a0c016495155ee598b7e0167b43d5d902414

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.