Linux Account Lockout Threshold Not Configured

漏洞信息

漏洞名称： Linux Account Lockout Threshold Not Configured

漏洞类型： 配置问题

漏洞等级： 高危

漏洞描述： 该漏洞涉及Linux系统中账户锁定阈值的未配置问题。Linux作为一种广泛使用的操作系统，在企业级服务和个人计算中都有广泛应用。其PAM（可插拔认证模块）模块负责处理认证相关的任务，包括账户锁定机制。漏洞的根本原因在于系统未正确配置账户锁定阈值，导致无法限制重复登录尝试，从而使系统容易受到暴力破解攻击。具体来说，当PAM模块中的pam_tally2.so或pam_faillock.so未设置deny参数时，系统不会在多次失败的登录尝试后锁定账户。这种配置问题可能导致攻击者通过自动化工具进行暴力破解，成功获取账户访问权限，进而执行未授权操作或数据泄露。由于该漏洞不需要攻击者具备特殊权限即可利用，且可以远程触发，因此其安全风险被评估为高危。

产品名称： Linux

来源： https://github.com/projectdiscovery/nuclei-templates/blob/1dc5e4c5a7e3689548a72d7cb2a00b803fccc824/misconfiguration%2Flinux%2Faccount-lockout-threshold-not-configured.yaml

类型： projectdiscovery/nuclei-templates:github issues

POC详情

id: account-lockout-threshold-not-configured

info:
  name: Linux Account Lockout Threshold Not Configured
  author: songyaeji
  severity: high
  description: >
    The system does not enforce an account lockout threshold. Without this control,
    repeated login attempts are not restricted, leaving the system vulnerable to brute-force attacks.
    This template checks whether account lockout settings are configured in PAM modules.
  reference:
    - https://isms.kisa.or.kr/main/csap/notice/
    - Cloud Vulnerability Assessment Guide(2024) by KISA
  tags: linux,local,pam,auth,misconfiguration,compliance
  metadata:
    verified: true
    os: linux
    max-request: 3
  classification:
    cwe-id: CWE-307
    cvss-metrics: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
    cvss-score: 5.5

self-contained: true

code:
  - engine:
      - bash
    source: |
      grep -E 'pam_tally2.so|pam_faillock.so' /etc/pam.d/system-auth /etc/pam.d/password-auth /etc/pam.d/common-auth 2>/dev/null || echo "no-lockout-config"
    matchers:
      - type: word
        part: code_1_response
        words:
          - "no-lockout-config"
      - type: regex
        part: code_1_response
        regex:
          - 'pam_tally2.so(?!.*deny=)'
          - 'pam_faillock.so(?!.*deny=)'