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黑客小黄鸭 渗透提权shell

21 Sep, 05:29

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置位(createLicenseCache_ = true)发生在 com.ibm.db2.jcc.am.Connection#completeConnect(boolean) 第 222 步 #initPostConnectionProperties(),而此后是否还有网络 flow 决定了通信错误能否发生在"已置位"的连接上。这取决于 PRDID 决定的 serverType:
// com.ibm.db2.jcc.am.Connection#completeConnect(boolean) 内部调用顺序(javap 偏移):
85 setSpecialRegisters() 网络 flow
153 setGlobalSessionVariables() 网络 flow
211 piggypackSetClientInfo...() 仅入队
222 initPostConnectionProperties() createLicenseCache_ = true ← 置位
383 checkForLicenseRestrictions() 仅 serverType 1/2/3 才有网络 flow
LUW(PRDID 前缀 SQL,serverType 4):第 383 步无网络 flow,置位后 getConnection 直接返回 —— 通信错误只能发生在返回后的首次 flow(任意 SQL),不能在 getConnection 内触发;
非 LUW 家族(PRDID 前缀 DSN/ARI/QSQ,serverType 1/2/3):第 383 步的 license 检查(#checkForLicenseRestrictions() -> #isLicenseValidatedWithServerLicenseProc() -> #callLicenseProcStaticV9())会 flow CALL SYSIBM.DB2CON_LIC —— 这提供了"置位之后"的网络交互,使整条触发链收敛在 getConnection 内部。DSN 前缀会被恢复器排除,因此验证器选用 QSQ12010(serverType 3,版本 ≥ 5.4.0 满足 license proc 条件)。
serverType 判定来自 com.ibm.db2.jcc.am.ProductLevel#getServerType(String)(取 PRDID 前 3 字符):DSN=1、ARI=2、QSQ=3、SQL=4、CSS=5、IFX=6。

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技术小黄鸭🟡:@Xiaohyaa

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