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卷土重来?黑客获利约130万美元,FEGexPRO合约被攻击事件分析
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2022年5月16日,成都链安链必应-区块链安全态势感知平台舆情监测显示,Ethereum和BNB Chain上FEGtoken项目的FEGexPRO合约遭受黑客攻击,黑客获利约3280 BNB 以及144 ETH,价值约130万美元。成都链安技术团队对事件进行了分析,结果如下。
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- D( u) j2 d2 \* C6 X#1 事件相关信息5 K2 W1 x9 c& x

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本次攻击事件包含多笔交易,部分交易信息如下所示:
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4 m- O: s- l7 Z( `" t) x' R攻击交易 (部分): t3 l* r' I* F( C' b4 [

5 D( Y7 ?8 F- P4 ?0 s; K2 A0x77cf448ceaf8f66e06d1537ef83218725670d3a509583ea0d161533fda56c063 (BNB Chain)+ `' L# p6 J( Z5 m2 H- B
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0x1e769a59a5a9dabec0cb7f21a3e346f55ae1972bb18ae5eeacdaa0bc3424abd2 (Ethereum)2 t5 f' p3 G$ D% t; T. f+ b/ k

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攻击者地址$ U. C" d- [) Y$ U5 p

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攻击合约( z9 V0 D5 ?, @6 }$ t) e  p( @1 l

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! g; x, u1 v$ Q被攻击合约(部分)# `& d5 e& x# `5 I- ?- k" \
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0x818e2013dd7d9bf4547aaabf6b617c1262578bc7 (BNB Chain)
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#2 攻击流程
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- u! i5 \; a  i5 ^! v0 q4 S5 vEthereum和BNB Chain上使用攻击手法相同,以下分析基于BNB Chain上攻击:
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. K6 B4 ?$ L+ @! z, z1. 攻击者调用攻击合约(0x9a84...f445)利用闪电贷从DVM合约(0xd534...0dd7)中借贷915.84 WBNB,然后将116.81 WBNB兑换成115.65 fBNB为后续攻击做准备。
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/ g3 m0 M3 {6 f% v! \  L2. 攻击者利用攻击合约创建了10个合约,为后续攻击做准备。+ h& M9 `8 o, _# }6 ?
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3. 攻击者接下来将兑换得到的fBNB代币抵押到FEGexPRO合约(0x818e...8bc7)中。/ D7 t- D6 `' b3 R, g3 f* w
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0 r/ ?) x) P  q, G8 D4. 然后攻击者重复调用depositInternal和swapToSwap函数,让FEGexPRO合约授权fBNB给之前创建好的其他攻击合约。
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/ P  G( R  H- O$ x) q5. 然后利用其他攻击合约调用transferFrom函数将FEGexPRO合约中fBNB全部转移到攻击合约(0x9a84...f445)中。
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3 `/ O; @' v1 X5 A" P* N6. 接下来又在LP交易对合约(0x2aa7...6c14)中借贷31,217,683,882,286.007211154 FEG代币和423 WBNB。: `- O; c  `6 M, i# z. S
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7. 然后重复3、4、5步骤的攻击手法,将FEGexPRO合约中大量FEG代币盗取到攻击合约中。
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8. 然后归还闪电贷,将获得的WBNB转入攻击合约中完成此笔攻击。
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9. 此后,又利用相同的原理,执行了50余笔相同的攻击,最获利约144 ETH和3280 BNB。+ O1 p1 I$ ^* A

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#3 漏洞分析+ j) ~! a2 `$ Q7 T7 x1 ]
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本次攻击主要利用了FEGexPRO合约中swapToSwap函数中path地址可控且合约中未对path地址进行有效性校验的漏洞。由于合约中depositInternal函数中更新用户余额时依赖于合约中当前代币余额,攻击者通过传入一个恶意的path地址,调用swapToSwap函数时合约中代币余额并未发生变化,导致攻击者可以反复重置攻击合约在FEGexPRO合约中记录的代币数量,从而让FEGexPRO合约将自身代币反复授权给攻击者所控制的多个恶意合约。
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# k; D$ J2 A' I9 h1 w#4 资金追踪
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截止发文时,被盗资金仍在攻击者地址(0x73b3...ff7c)中并未转移。
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# L( Q5 ^3 L. D9 E3 M. V- {#5 总结
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0 V9 D5 x2 J* V' ?) X4 V% R针对本次事件,成都链安技术团队建议:2 E/ v7 R6 V2 p! w; @/ D
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% @1 D: I" S+ Y1 v% I  O项目开发时,应该注意与其他合约交互时可能存在的安全风险,尽量避免将关键参数设置为用户可控。如果业务需求如此,则需要严格判断用户输入的参数是否存在风险。此外建议项目上线前选择专业的安全审计公司进行全面的安全审计,规避安全风险。
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2#
黑客也是厉害啊,又是赚到很多。
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开始发新闻了,也是一堆吧
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如果是行业内的人可以分析一下
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5#
主题回复处广告图案-天策传媒
那你还赶紧的去出手赢个几百万的
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6#
这类新闻适当看一看就可以了
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7#
以后还是立志去干黑客比较赚钱
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8#
黑客很厉害啊,又是赚到了不少的钱的咯
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有门技术肯定是比较好赚钱的事
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这也是要有技术的才能做到了
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还是需要有技术才能够赚钱呢。
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12#
这些黑客果然也是很厉害了
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13#
黑客真的是牛逼哄哄了的哦。
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14#
黑客的火力的那么多啊
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15#
黑客,真厉害,无所不在啊,这是
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16#
看来它还是挺引人注目的公司
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:P :$ ;P :L :Q :lol
:loveliness: :funk: :curse: :dizzy: :shutup: :sleepy:
:hug: :victory: :time: :kiss: :handshake: :call:
:hug: :victory: :time: :kiss: :handshake: :call:
:hug: :victory: :time: :kiss: :handshake: :call:
:hug: :victory: :time: :kiss: :handshake: :call:
:hug: :victory: :time: :kiss: :handshake: :call:
:hug: :victory: :time: :kiss: :handshake:
未有绑定记录
 


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