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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。. H1 h$ B0 x2 ^, q
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#1 事件相关信息, t& a! l! D  b: k: \
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# \# `* D* G( Y本次攻击事件包含多笔交易,部分交易信息如下所示:7 z9 Q9 v/ O/ U+ e) L& v# E6 D
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攻击交易 (部分): ]9 s9 R, `# ]+ O& i

6 G$ d6 T) a# R' o0x77cf448ceaf8f66e06d1537ef83218725670d3a509583ea0d161533fda56c063 (BNB Chain)% X: A3 H$ O* m
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0x1e769a59a5a9dabec0cb7f21a3e346f55ae1972bb18ae5eeacdaa0bc3424abd2 (Ethereum)% ^! n0 p, q" r) l/ K

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攻击者地址4 \# N; n8 P5 Z2 H0 ^  ^

1 K% g% k8 Z6 b3 V5 V/ X1 v" E0x73b359d5da488eb2e97990619976f2f004e9ff7c
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攻击合约
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2 h5 l) o4 P% C- b* H! {) a, G1 ^被攻击合约(部分)% {8 P* f0 V% g: q4 e0 J

# x" u2 d) f& L0x818e2013dd7d9bf4547aaabf6b617c1262578bc7 (BNB Chain)1 p) D; P! f) t+ [0 H0 m

5 I7 |* y! l# j+ Q& l6 k7 k: z0xf2bda964ec2d2fcb1610c886ed4831bf58f64948 (Ethereum)
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* d( ?$ {0 m. F  [# `1 L+ X#2 攻击流程, d6 ]6 e+ `$ e3 t( o$ V% c

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9 ?% z' C( h1 k/ ~3 A8 T4 _Ethereum和BNB Chain上使用攻击手法相同,以下分析基于BNB Chain上攻击:2 |, X8 s; J6 ?! W% Z: ?/ x
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6 i! g$ N! M  E& {& [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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- r. Z4 D' W* D+ i6 T3. 攻击者接下来将兑换得到的fBNB代币抵押到FEGexPRO合约(0x818e...8bc7)中。4 p) Q! g0 S  t5 J

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. Y% e- v) r- T4. 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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5. 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。) i- R2 m8 v! [

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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。9 r* O9 C. U3 p; k

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" Q% U5 ^* W6 E; _% P" \9 u7 m5 l# x7. 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。/ C5 B" \! z  E9 D( ~
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/ i& B1 i$ v$ ~3 c4 U7 y) T* E7 K# W9. 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。$ ^% f2 _  \% h# n5 P2 g: _) u

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#3 漏洞分析9 b' F( A: A: I

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( h8 P6 G( ?1 M" V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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#4 资金追踪5 l. `! a$ a  m! r" d+ E2 s& L
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4 N+ D& s+ Y1 H, M! o, B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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: F! j$ E+ U( c#5 总结% b9 C! D5 Z: U. q! s
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; F8 k* O- Q8 Y6 X针对本次事件,成都链安技术团队建议:
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; }3 U( k2 g  h' b4 s  D* d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。) F" i; @+ p3 K/ O" q1 Z

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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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:) :( :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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