What is CVE-2018-15543?

CVE-2018-15543 is a medium-severity vulnerability in Telegram, classified under Improper Authentication. CVSS score: 6.8/10. Published 2018-10-09.

How severe is CVE-2018-15543?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Auth bypass in Telegram

CVE-2018-15543

An issue was discovered in the org.telegram.messenger application 4.8.11 for Android. The FingerprintManager class for Biometric validation allows authentication bypass through the callback method from onAuthenticationFailed to onAuthenticationSucceeded with null, because the fingerprint API in conjunction with the Android keyGenerator class is not implemented. In other words, an attacker could authenticate with an arbitrary fingerprint. NOTE: the vendor indicates that this is not an attack of interest within the context of their threat model, which excludes Android devices on which rooting has occurred

Vulnerability class: Broken Authentication

EPSS: 0.004 (35.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Telegram — versions 4.8.11
N/a — versions n/a

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

cve@mitre.org (Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2018-15543?: CVE-2018-15543 is a medium-severity vulnerability in Telegram, classified under Improper Authentication. CVSS score: 6.8/10. Published 2018-10-09.
How severe is CVE-2018-15543?: Medium severity. CVSS v3 base score is 6.8 out of 10.