Vulnerability Details CVE-2019-18800
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 46.2%
CVSS Severity
CVSS v3 Score 8.8
CVSS v2 Score 4.3
References
Products affected by CVE-2019-18800
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cpe:2.3:a:rakuten:viber:11.5.0.6
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cpe:2.3:a:rakuten:viber:11.6.0.15
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cpe:2.3:a:rakuten:viber:11.6.0.18
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cpe:2.3:a:rakuten:viber:11.6.1.1
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cpe:2.3:a:rakuten:viber:11.6.2.4
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cpe:2.3:a:rakuten:viber:11.6.3.2
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cpe:2.3:a:rakuten:viber:11.6.3.4
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cpe:2.3:a:rakuten:viber:11.7.0.5
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cpe:2.3:a:rakuten:viber:9.3.0.6