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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。6 e7 u2 H( F* T, Z

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+ O: G8 |- [# @, B#1 事件相关信息* M* ~( F1 B( b

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2 a5 x( C7 }0 i( ^& e- v/ B4 O! h本次攻击事件包含多笔交易,部分交易信息如下所示:5 F6 O% s2 H- a, X+ }3 c

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# |6 F: F, E; ]/ _攻击交易 (部分)% T& e2 O' s# I& P8 U; p. G! z

/ k' _& Z* B# q, z, A% r* g" w0x77cf448ceaf8f66e06d1537ef83218725670d3a509583ea0d161533fda56c063 (BNB Chain)
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% l7 P, d" V  N( s( A% Q0x1e769a59a5a9dabec0cb7f21a3e346f55ae1972bb18ae5eeacdaa0bc3424abd2 (Ethereum)
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  z3 l  O8 Y1 O  q( F攻击者地址' l; ^* i) c  `. x3 F7 t, ?# i

& R5 X, P" g4 K& R0 Z/ I0x73b359d5da488eb2e97990619976f2f004e9ff7c
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攻击合约5 y, r1 k/ Z. H. ^

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被攻击合约(部分)
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/ c  k4 M) W) G7 a2 X0x818e2013dd7d9bf4547aaabf6b617c1262578bc7 (BNB Chain)% x- u, C6 M; X

/ r: H: b2 l: @7 q1 ~" ~9 u5 F0xf2bda964ec2d2fcb1610c886ed4831bf58f64948 (Ethereum)
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. o' A% f: G2 r2 B- \7 x: m# ]#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:
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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。7 Z* }. Y5 D$ a: k) _$ Y- d( P6 b
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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。; _2 n, W% S: M
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: @3 o2 P; G& Z' X3. 攻击者接下来将兑换得到的fBNB代币抵押到FEGexPRO合约(0x818e...8bc7)中。
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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。
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+ K3 K. A7 w% I3 F/ {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。* l$ S" S, X* U. ~

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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。
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. l4 k( X4 K. |- {# e8 f7. 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。* O5 A5 U; a$ R/ b
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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。7 r4 Z$ D5 t0 u% q% R

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#3 漏洞分析
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. M, f8 u3 H# r" K6 e! f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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" C! ?% N# J  F* s9 J* j#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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#5 总结
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* f; U4 t8 |* c* {$ _' t针对本次事件,成都链安技术团队建议:2 `& g' {  p  j

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% ^# c1 ^& O: z9 m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。" |; J+ F/ ]( V) V9 t3 X" j
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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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