CVE-2020-14342

Public on

Last Modified: UTC

Description

A flaw was found in cifs-utils' mount.cifs where it was invoking a shell when requesting the Samba password, which could be used to inject arbitrary commands. This flaw allows an attacker who can invoke mount.cifs with special permission, such as via sudo rules, to escalate their privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

A flaw was found in cifs-utils' mount.cifs where it was invoking a shell when requesting the Samba password, which could be used to inject arbitrary commands. This flaw allows an attacker who can invoke mount.cifs with special permission, such as via sudo rules, to escalate their privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Statement

In order to exploit this flaw, the attacker would need to be able to inject a specially crafted username into the command run by root. This requires a specific setup (e.g.: sudo rules, etc.). As a result, the vulnerability is considered as low severity.

In order to exploit this flaw, the attacker would need to be able to inject a specially crafted username into the command run by root. This requires a specific setup (e.g.: sudo rules, etc.). As a result, the vulnerability is considered as low severity.

Additional information

  • Bugzilla 1860884: cifs-utils: shell command injection in mount.cifs
  • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
  • FAQ: Frequently asked questions about CVE-2020-14342

Common Vulnerability Scoring System (CVSS) Score Details

Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 Score Breakdown
Red HatNVD

CVSS v3 Base Score

7

7

Attack Vector

Local

Local

Attack Complexity

High

High

Privileges Required

Low

Low

User Interaction

None

None

Scope

Unchanged

Unchanged

Confidentiality Impact

High

High

Integrity Impact

High

High

Availability Impact

High

High

CVSS v3 Vector

Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Acknowledgements

Red Hat would like to thank Aurélien Aptel (SUSE Labs Samba Team) for reporting this issue. Upstream acknowledges Vadim Lebedev as the original reporter.

Frequently Asked Questions

Why is Red Hat's CVSS v3 score or Impact different from other vendors?

My product is listed as "Under investigation" or "Affected", when will Red Hat release a fix for this vulnerability?

What can I do if my product is listed as "Will not fix"?

What can I do if my product is listed as "Fix deferred"?

What is a mitigation?

I have a Red Hat product but it is not in the above list, is it affected?

Why is my security scanner reporting my product as vulnerable to this vulnerability even though my product version is fixed or not affected?

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