Auth bypass in Telegram

CVE-2018-15542

An issue was discovered in the org.telegram.messenger application 4.8.11 for Android. The Passcode feature allows authentication bypass via runtime manipulation that forces a certain method's return value to true. In other words, an attacker could authenticate with an arbitrary passcode. 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: 0.003 (26.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.0/AV:P/AC:H/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)

References

Frequently asked questions

What is CVE-2018-15542?
CVE-2018-15542 is a medium-severity vulnerability in Telegram, classified under Improper Authentication. CVSS score: 6.4/10. Published 2018-10-09.
How severe is CVE-2018-15542?
Medium severity. CVSS v3 base score is 6.4 out of 10.