Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Rakuten | Viber | <= 11.7.0.5 |
Related Weaknesses (CWE)
References
- https://thesamarkand.tumblr.com/post/188785277609/viber-messenger-remote-accountExploitThird Party Advisory
- https://thesamarkand.tumblr.com/post/188785277609/viber-messenger-remote-accountExploitThird Party Advisory
FAQ
What is CVE-2019-18800?
CVE-2019-18800 is a vulnerability with a CVSS score of 8.8 (HIGH). 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...
How severe is CVE-2019-18800?
CVE-2019-18800 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-18800?
Check the references section above for vendor advisories and patch information. Affected products include: Rakuten Viber.