Multiple vulnerabilities in Util-linux libmount



Published: 2022-01-25
Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-3996
CVE-2021-3995
CWE-ID CWE-264
Exploitation vector Local
Public exploit N/A
Vulnerable software
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Util-linux
Universal components / Libraries / Libraries used by multiple products

Vendor kernel.org

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU60005

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3996

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

Exploit availability: No

Description

The vulnerability allows a local user to bypass implemented security restrictions.

The vulnerability exists due to improper UID check in libmount. A local user can unmount FUSE filesystems of users with similar UID.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Util-linux: 2.2 - 2.37.2

External links

http://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes
http://www.openwall.com/lists/oss-security/2022/01/24/2


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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

2) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU60004

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3995

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

Exploit availability: No

Description

The vulnerability allows a local user to bypass implemented security restrictions.

The vulnerability exists due to improper parsing of the /proc/self/mountinfo file in libmount. A local user can unmount other user's filesystems that are either world-writable themselves or mounted in a world-writable directory.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Util-linux: 2.2 - 2.37.2

External links

http://www.openwall.com/lists/oss-security/2022/01/24/2
http://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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



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