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php-deser-audit

Testing & Quality
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PHP Web 源码反序列化/对象注入审计工具。识别 unserialize 注入点与可控数据来源,追踪魔术方法链,输出可利用性分级、PoC 与修复建议(禁止省略)。

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Source SKILL.md: https://github.com/0xShe/PHP-Code-Audit-Skill/blob/HEAD/php-deser-audit/SKILL.md

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PHP 反序列化审计(php-deser-audit)

分析 PHP 项目源码,识别用户可控数据进入 unserialize() 或等价反序列化点,结合类的魔术方法(__wakeup/__destruct/__call/__toString/{value})判断是否存在对象注入可利用链。

分级与编号

  • 详见:shared/SEVERITY_RATING.md
  • 漏洞编号:{C/H/M/L}-DESER-{序号}

危险 Sink(必做)

  • unserialize($data)
  • unserialize(base64_decode({value}))
  • 任何将用户输入转换后再反序列化的路径

可控性(必做)

必须追踪并输出:

  • 反序列化入参来自哪里:GET/POST/Cookie/Session/Header/数据库字段等
  • 是否存在 base64/加密/解码/拼接步骤(仍可能可控)
  • 是否有校验/签名(如 hash_hmac)以及签名是否可靠(需要证据)

gadget 链识别(必做)

必须输出:

  • 反序列化后的对象类型(或可能类型集合)
  • 该类型类中魔术方法列表与触发条件
  • “从对象创建 -> 魔术方法触发 -> 最终敏感操作(如文件/命令/SSRF/数据库)”的数据流链

tracer 触发条件(必做)

  • 反序列化入参经过多层 decode/封装
  • 魔术方法链跨多个类/文件

证据引用(强制:来自 php-route-tracer)

每条反序列化/对象注入疑似漏洞必须逐项引用 trace 输出中 ## 9) Sink Evidence Type Checklist 的 DESER 行对应证据要点(允许状态为待验证,但证据引用必须存在):

  1. EVID_DESER_CALLSITE:反序列化调用点位置证据(unserialize 等等价点)
  2. EVID_DESER_INPUT_SOURCE:入参用户可控来源证据
  3. EVID_DESER_OBJECT_TYPE_MAGIC_TRIGGER_CHAIN:反序列化后对象类型/魔术方法触发条件证据(以及最终敏感操作点链路证据,若能定位)

tracer 证据缺失处理(强制)

  • 若无法定位上述 1~3 任一关键证据要点:该漏洞状态只能标记为 ⚠️待验证,不得直接给出 ✅已确认可利用。

报告输出

输出到:

{output_path}/vuln_audit/deser_{timestamp}.md

PoC(强制,但标注为“概念 PoC/验证 PoC”)

必须给出:

  • 真实路由(或 cookie/session 字段使用方式)
  • payload 生成思路(若无法生成真实 gadget payload,必须给出“需人工补齐的部分”并说明原因,同时仍保留可执行框架与可替换字段)