美國FCC祭出新規定以防範SIM卡挾持攻擊
· 2023-11-21

美國當地電信業者協助用戶門號移轉至其他裝置或供應商之前,必須向申請者進行身分驗證措施,防範詐騙分子以社交工程手法,取得用戶門號控制權

Photo by Andrey Metelev on Unsplash

美國聯邦通訊委員會(Federal Communications Commission,FCC)上周針對美國的電信營運商祭出了新規定,以防範消費者的手機遭到SIM卡挾持(SIM Swap)攻擊。

SIM卡挾持指的是駭客取信於受害者的電信營運商,以將受害者的手機服務移轉到駭客的手機上,進而使駭客取得基於受害者身分的一次性認證碼,執行詐騙交易。在FBI網路犯罪投訴中心(IC3)去年的消費者投訴統計中,SIM卡挾持雖然不是名列前茅,卻也榜上有名,總計接到超過2,000次的投訴,損失金額超過7,000萬美元

此次FCC修訂了客戶專有之網路資訊(Customer Proprietary Network Information,CPNI)與市話可攜(Local Number Portability,LNP)的規定,要求服務供應商在將客戶的電話號碼移轉至新裝置或新供應商時,必須採用安全的方法來驗證客戶的身分,包括必須立即通知客戶,以及採取額外的措施來保護客戶,以避免客戶受到SIM卡挾持攻擊。

2020年時,幾位美國普林斯頓大學的研究人員曾經親自實驗SIM卡挾持攻擊,他們向5家不同的電信營運商各購買10張預付卡,再打電話去客服,宣稱所購買的SIM卡故障了,可否將身分切換到新SIM卡上,結果在50張SIM卡中,成功切換了39張,成效驚人。

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