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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:, f" k9 j6 s1 r5 k

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5 c6 s  p: N) U5 T$ [3 v9 t/ P6 j攻击交易 (部分)
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' y9 f' x, o) f- J- V0x77cf448ceaf8f66e06d1537ef83218725670d3a509583ea0d161533fda56c063 (BNB Chain)
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9 @  y' K* L0 m% p0x1e769a59a5a9dabec0cb7f21a3e346f55ae1972bb18ae5eeacdaa0bc3424abd2 (Ethereum)2 v8 }6 g" \" q9 R

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0 c- u# o6 E$ F1 @  {4 O- C攻击者地址
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* i/ D' Q0 L* T0 ?0x73b359d5da488eb2e97990619976f2f004e9ff7c
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8 I+ S" z% w& t# C, P% t6 u6 h攻击合约
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0x9a843bb125a3c03f496cb44653741f2cef82f445
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8 ]1 V. H6 z. Y/ Z5 r1 |4 d' \被攻击合约(部分)
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0x818e2013dd7d9bf4547aaabf6b617c1262578bc7 (BNB Chain)
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  u4 r" |& e: X: @8 D* x9 m0xf2bda964ec2d2fcb1610c886ed4831bf58f64948 (Ethereum)7 i: D) Y- a* Z! \, 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:
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* c+ B  c$ H5 P1 |' }. K2 a' i1. 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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' j! X& s  {7 [( ^- X2. 攻击者利用攻击合约创建了10个合约,为后续攻击做准备。7 s% M3 K: H$ A9 ~
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2 f% e1 S7 U& @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。# ^; y. J; h* b

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4 X  I4 g; `( {/ T0 m4. 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。
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1 x0 B4 K4 j; y8 l  {- |) d! p6. 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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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。% N$ \( u2 m: l1 p& K# m
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4 b  u/ L* u9 Z/ e; {5 s4 v- y8. 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。0 |8 p4 k# a, ]8 u! T, h, `

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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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" Z  L, X6 G2 E2 M0 f#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 S7 U' }5 l( D" U

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  K' L: p" {- E! G2 W* h& v#4 资金追踪$ o( w& u/ f) M, K# ^! z
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; G) x( H5 b8 \  h# F6 U2 ]) M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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8 G: m2 p4 W- o2 [- ^#5 总结
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针对本次事件,成都链安技术团队建议:
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- F; ^$ t; c* X: d8 z  f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。- Z$ n& i7 T7 o) A& b
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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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: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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