Viber for Windows up to 13.2.0.39 does not properly quote its custom URI handler. A malicious website could launch Viber with arbitrary parameters, forcing a victim to send an NTLM authentication request, and either relay the request or capture the hash for offline password cracking. NOTE: this issue exists because of an incomplete fix for CVE-2019-12569.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-14049
• https://jeffs.sh/CVEs/CVE-2020-14049.txt
• https://www.viber.com/en/security/