CVE-2020-14342
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.
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.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert: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 Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7 | 7 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | High | High | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | High | High | N/A |
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.
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