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Viber through 11.7.0.5 allows a remote attacker who can capture a victim's internet traffic to steal their Viber account, because not all Viber protocol traffic is encrypted. TCP data packet 9 on port 4244 from the victim's device contains cleartext information such as the device model and OS version, IMSI, and 20 bytes of udid in a binary format, which is located at offset 0x14 of this packet. Then, the attacker installs Viber on his device, initiates the registration process for any phone number, but doesn't enter a pin from SMS. Instead, he closes Viber. Next, the attacker rewrites his udid with the victim's udid, modifying the viber_udid file, which is located in the Viber preferences folder. (The udid is stored in a hexadecimal format.) Finally, the attacker starts Viber again and enters the pin from SMS.

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Viber 输入验证错误漏洞

Viber是一套跨平台的即时通信软件。 Viber 11.7.0.5及之前版本中存在输入验证错误漏洞，该漏洞源于程序没有对所有的Viber协议流量进行加密。远程攻击者可通过捕获用户的网络流量利用该漏洞获取敏感信息。

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