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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。1 Z* t. U$ j# C" R6 f0 Z/ F

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#1 事件相关信息
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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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" s# o+ O8 z3 X8 N7 O. A攻击交易 (部分)
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7 m  @' i2 U0 _, P7 a0x77cf448ceaf8f66e06d1537ef83218725670d3a509583ea0d161533fda56c063 (BNB Chain)5 x& [/ S& s* c" q7 L

' I3 E4 B1 @+ M2 O7 N5 I# Y0x1e769a59a5a9dabec0cb7f21a3e346f55ae1972bb18ae5eeacdaa0bc3424abd2 (Ethereum)6 P1 G' |( q6 _+ d

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) Q2 Y$ y" w( k, a: j0 Q6 }5 _攻击者地址8 ^9 u' Q& z5 D) |
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0x73b359d5da488eb2e97990619976f2f004e9ff7c+ N3 r# t" ?1 w3 h- r9 N: {

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攻击合约
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; i2 a& T! O9 A( h) t被攻击合约(部分). W. J" G* A- w8 R" a+ P2 X
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0x818e2013dd7d9bf4547aaabf6b617c1262578bc7 (BNB Chain)& }: C  H% `# Z8 ]8 C$ h3 h0 |
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0xf2bda964ec2d2fcb1610c886ed4831bf58f64948 (Ethereum)3 W. }$ x* q: k) S5 g# V0 V
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#2 攻击流程, H6 Y) F5 c+ z4 G, x: n

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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:9 d" P2 Z6 m5 ~9 c- O
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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。. Z' ^2 L' I- U/ P
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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。
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0 F" d* {6 j2 e6 {9 a( y4. 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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) V3 V  w+ `" R8 p; N5. 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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; n- }3 c! E  [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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1 D: h9 s2 w. f4 `9 f" Y# j7. 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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  k6 W! i+ i3 k. T9 y! j8. 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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: R0 Z! ?, W) D: {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。0 A7 h, r0 _5 J0 k
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#3 漏洞分析+ f& i) q7 B! {% S& T2 d/ I: u

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/ w2 r& a. J& m# k. n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。- |+ k2 Z' }8 F
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) a! m# e1 h; o  `3 b#4 资金追踪: |# _$ T, F: }. ?. A" _: [
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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。3 a' P3 m0 T' a) T1 G- J' m! B

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# R4 O( b1 U+ D#5 总结
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- v; k1 r0 \# ^3 }: w针对本次事件,成都链安技术团队建议:$ ^4 O0 p7 [  z. f/ q# l  @/ U2 h2 e
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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。2 e( u6 F$ I- s0 L1 Q# `: I1 F

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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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:) :( :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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