PT-2018-15375 · Telegram · Telegram

Capitan Alfalo · Published 2018-12-24 · Updated 2024-08-05 · CVE-2018-20436

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Telegram version 4.9.1 Telegram Web-version 0.7.0

Description The issue concerns a side channel in the "secret chat" feature where Telegram servers send GET requests for URLs typed while composing a chat message, before the message is sent. Additionally, GET requests are sent to other URLs on the same web server. This can also be interpreted as a Server-Side Request Forgery (SSRF) issue. A third party has reported that the behavior may be caused by misconfiguration of the "Secret chats > Preview links" setting.

Recommendations For Telegram version 4.9.1, consider disabling the "Secret chats > Preview links" setting to minimize the risk of exploitation. For Telegram Web-version 0.7.0, restrict access to the "secret chat" feature until the issue is resolved. As a temporary workaround, avoid using the "secret chat" feature in affected versions until a fix is available.

Exploit

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2018-20436

Affected Products

Telegram

References · 4

• 🔥 https://misteralfa-hack.blogspot.com/2018/12/telegram-siempre-in-middle.html · Exploit
• 🔥 https://misteralfa-hack.blogspot.com/2018/12/abusando-de-telegram-para-conseguir-una.html · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2018-20436 · Security Note
• https://osv.dev/vulnerability/CVE-2018-20436 · Vendor Advisory