CVE-2018-1057
개요
A flaw was found in the way Samba AD DC validated user permissions. An authenticated attacker could use this flaw to change any other users passwords, including administrative users.
내용
The versions of samba shipped with Red Hat Enterprise Linux 6 and 7 do not support Active Directory Domain Controller (AD-DC) mode. Therefore this flaw does not affect Red Hat Enterprise Linux 6 and 7.
완화 방법
Revoke the change passwords right for everyone from all user objects (including computers) in the directory. Note that this will prevent users from being able to change their own expired passwords, so the maximum password age should be set to a value that prevents user passwords from expiring while the workaround is in place. For more information please refer to: https://bugzilla.redhat.com/show_bug.cgi?id=1553553#c3
CVSS (Common Vulnerability Scoring System) 점수 세부 사항
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).
다음의 CVSS 지표 및 점수는 예비 정보로 검토 대상입니다.
CVSS v3 점수 분석
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| 기본 점수 | 7.4 | 8.8 | N/A |
| 공격 벡터 | Adjacent Network | Network | N/A |
| 공격 복잡성 | Low | Low | N/A |
| 필요한 권한 | Low | Low | N/A |
| 사용자 상호 작용 | Required | None | N/A |
| 범위 | Unchanged | Unchanged | N/A |
| 기밀성 | High | High | N/A |
| 무결성에 미치는 영향 | High | High | N/A |
| 가용성에 미치는 영향 | High | High | N/A |
벡터
Red Hat: CVSS:3.0/AV:A/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
취약점 이해 (CWE)
Confidentiality
Technical Impact: Read Application Data; Read Files or Directories
An attacker could bypass intended access restrictions to read sensitive data, either by reading the data directly from a data store that is not correctly restricted, or by accessing insufficiently-protected, privileged functionality to read the data.
Integrity
Technical Impact: Modify Application Data; Modify Files or Directories
An attacker could bypass intended access restrictions to modify sensitive data, either by writing the data directly to a data store that is not correctly restricted, or by accessing insufficiently-protected, privileged functionality to write the data.
Access Control
Technical Impact: Gain Privileges or Assume Identity; Bypass Protection Mechanism
An attacker could bypass intended access restrictions to gain privileges by modifying or reading critical data directly, or by accessing privileged functionality.
Confidentiality,Integrity,Availability
Technical Impact: Execute Unauthorized Code or Commands
An attacker could use elevated privileges to execute unauthorized commands or code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
An attacker could gain unauthorized access to resources on the system and excessively consume those resources, leading to a denial of service.
감사의 말
Red Hat would like to thank the Samba project for reporting this issue. Upstream acknowledges Björn Baumbach (Sernet) as the original reporter.
