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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
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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:8 l. o/ i7 Q1 y6 w% R  p
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攻击交易 (部分)
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0x77cf448ceaf8f66e06d1537ef83218725670d3a509583ea0d161533fda56c063 (BNB Chain)9 U/ [/ W$ @& J+ C9 X+ ~

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2 A: j* u$ ?: r" B( v% E+ G攻击者地址' Q3 q" O9 F  n* c0 h
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0x73b359d5da488eb2e97990619976f2f004e9ff7c+ t5 ~5 c* b2 s* h1 {
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攻击合约4 {/ l9 Q( a- z* J
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0x9a843bb125a3c03f496cb44653741f2cef82f445
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被攻击合约(部分)
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0x818e2013dd7d9bf4547aaabf6b617c1262578bc7 (BNB Chain)/ J, v  S' ?0 h% |# p2 X
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0xf2bda964ec2d2fcb1610c886ed4831bf58f64948 (Ethereum)
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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:
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) u& ?% D  ~; }+ c; G1. 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。+ y9 }) h. y- m
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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。: J2 X: O2 E; `, w1 \
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% m" k) w% B5 }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。- I" f2 o% J1 Y/ h; h

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5 y; _0 Z/ G5 F  O4. 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。: y6 Z9 U3 a3 `$ q$ f

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/ t8 n" W3 z# I' {( C9 ]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。: s9 E) x/ _" Q

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* _$ L4 `1 ?, h0 `1 I8 g, ]* v6. 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。, C$ M3 I* Q& E' y" `

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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。  F3 n. c6 x7 m2 X4 C4 `3 q7 h

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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。
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! N0 P" a' L4 y5 z  m$ @) s#3 漏洞分析
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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。2 S% n: w+ p5 I! [0 }. W* h6 G

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#4 资金追踪
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- q& }- F3 i& U6 }% i截止发文时,被盗资金仍在攻击者地址(0x73b3...ff7c)中并未转移。! n* M! v5 r; q; ~' Y4 ?6 v) q
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#5 总结
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6 q; H: s& b1 D$ C3 N/ {- i针对本次事件,成都链安技术团队建议:
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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。
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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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