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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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1#
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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#1 事件相关信息- ?: e  v+ w' d$ ?! A8 Z( o
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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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, N2 P; S+ ?& ~, h0 K6 {, s  N攻击交易 (部分)
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8 w/ p: i+ W% E4 W( P5 R5 Z0x77cf448ceaf8f66e06d1537ef83218725670d3a509583ea0d161533fda56c063 (BNB Chain)2 H+ e4 ?4 c, J- r! t7 X& \. |" N$ N

( z0 Z* J4 W, W) e; T  B  [  s; ?0x1e769a59a5a9dabec0cb7f21a3e346f55ae1972bb18ae5eeacdaa0bc3424abd2 (Ethereum)
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攻击者地址/ s$ O1 }- D* Z2 h" L3 p

1 I; b) `5 L' d0x73b359d5da488eb2e97990619976f2f004e9ff7c4 O0 X) X3 Z5 b/ k, Y

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/ K" g4 J! y8 V5 b: `攻击合约
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0x9a843bb125a3c03f496cb44653741f2cef82f445
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被攻击合约(部分)# t7 B- h9 e& X, {! n! p4 i

2 m6 S2 A" \6 K6 Q  g0x818e2013dd7d9bf4547aaabf6b617c1262578bc7 (BNB Chain)9 N4 U' k( q; Y6 Y/ K
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0xf2bda964ec2d2fcb1610c886ed4831bf58f64948 (Ethereum)3 b" ^6 J2 a2 F0 |3 V

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#2 攻击流程
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Ethereum和BNB Chain上使用攻击手法相同,以下分析基于BNB Chain上攻击:! Q0 q& y+ y$ \0 K# R" l% x
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1. 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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2. 攻击者利用攻击合约创建了10个合约,为后续攻击做准备。
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0 M% _6 V2 o; ]. ^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。0 q" {& Q! s. d, P9 Y8 K" W

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- H3 A+ |  Z, M/ V2 {4. 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。& C4 p' j4 v# p

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) I2 o! N9 ]  C1 g5. 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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. l  @8 p9 y# ~6. 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。% A) j+ `( l3 m7 t" V% o
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) S; C7 r8 ]# g* V, X: ]5 @1 l7 m6 P7. 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。- z+ {& d  W1 a- p
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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。5 V. h( @. I; i! \& L( Q

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: U) `3 W) d- J9. 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。5 ]4 y7 n5 s7 S) S0 p( h
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#3 漏洞分析/ w7 t, M1 J. s5 \0 [
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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。& c+ V) O% Y) O' E6 L( e  i: j4 W3 k

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1 k/ _5 ~6 w' r- |1 T# L2 }! j#4 资金追踪
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& s0 {: h4 W; c) C" U' I4 \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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! f8 l4 ?# d' x1 X6 c5 U! f#5 总结
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针对本次事件,成都链安技术团队建议:2 M" L  n5 H1 [0 K0 p

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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。6 z3 c  t, `" x0 k1 d$ X' j

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16#
看来它还是挺引人注目的公司
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15#
黑客,真厉害,无所不在啊,这是
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14#
黑客的火力的那么多啊
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13#
黑客真的是牛逼哄哄了的哦。
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12#
这些黑客果然也是很厉害了
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还是需要有技术才能够赚钱呢。
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这也是要有技术的才能做到了
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有门技术肯定是比较好赚钱的事
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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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7#
以后还是立志去干黑客比较赚钱
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6#
这类新闻适当看一看就可以了
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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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如果是行业内的人可以分析一下
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开始发新闻了,也是一堆吧
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2#
黑客也是厉害啊,又是赚到很多。
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:P :$ ;P :L :Q :lol
:loveliness: :funk: :curse: :dizzy: :shutup: :sleepy:
:hug: :victory: :time: :kiss: :handshake: :call:
:hug: :victory:
:) :( :D :'( :@ :o
: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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